the sulforaphane compound used in the present invention refers to sulforaphane and sulforaphane glucosinolate . sulforaphane glucosinolate is a glycoside of sulforaphane . these sulforaphane compounds are known to be contained in large amounts in cruciferous plants , such as broccoli and cabbage . it is known that , for example , when such a plant is cut ( e . g ., cut with a knife or chewed ), sulforaphane glucosinolate is hydrolyzed by myrosinase , which is an enzyme present in plants , to produce sulforaphane . a similar hydrolysis is known to also occur by the action of intestinal bacteria and digestive enzymes . therefore , preferred examples of the sulforaphane compound in the present invention include crushed products ( e . g ., purees ) and juices of cruciferous plants , and their dried products , fractionated products , purified products , etc . the proportion of the sulforaphane compound in the obesity - suppressing composition of the present invention is not particularly limited . for example , the proportion in terms of sulforaphane is preferably about 0 . 000001 to 0 . 5 mass %, and more preferably about 0 . 000005 to 0 . 25 mass %. the lower limit is more preferably 0 . 0001 mass % or more , and even more preferably 0 . 0005 mass % or more . further , the amount of the sulforaphane compound in the obesity - suppressing composition of the present invention is not particularly limited , but can be suitably selected according to the embodiment so that the amount in terms of sulforaphane is preferably 0 . 1 to 1 . 0 mg , more preferably 0 . 1 to 0 . 6 mg , and even more preferably 0 . 1 to 0 . 5 mg . when the obesity - suppressing composition of the present invention is ingested , the amount of the sulforaphane compound ingested by an adult per day is not particularly limited , but can be suitably selected according to the embodiment so that the amount in terms of sulforaphane is preferably 0 . 1 to 1 . 0 mg , more preferably 0 . 1 to 0 . 6 mg , and even more preferably 0 . 1 to 0 . 5 mg . the willow extract used in the present invention is extracted from a plant in the genus salix or populus of the family salicaceae . examples of plants in the genus populus of the family salicaceae include “ urajirohako yanagi ” ( synonyms : “ hakuyo ” and “ gindoro ”; p . alba ), canadian poplar ( p .× canadensis ), cottonwood ( p . deltoides ) ( synonym : “ hiroha hakoyanagi ”), “ kotokake yanagi ” ( p . euphratica ), “ oobayamanarashi ” ( p . tomentosa ), “ chirimendoro ” ( p . koreana ), “ doronoki ” ( p . maximowiczii ), “ yoroppa kuroyamanarashi ” ( p . nigra ), “ seiyo hakoyanagi ” ( synonym : “ italia yamanarashi ”; p . nigra var . italica ), “ yamanarashi ” ( synonyms : “ hakoyanagi ” and “ popura ”; p . sieboldii ), balsam poplar ( p . tacamahaca ), “ shina yamanarashi ,” “ chosen yamanarashi ” ( p . davidiana ), american poplar ( p . tremuloides ), and p . euramericana . examples of plants in the genus salix of the family salicaceae include white willow ( s . alba ), “ saikoku kitsune yanagi ” ( s . alopochroa ), “ yusuraba yanagi ” ( s . aurita ), “ shidare yanagi ” ( synonym : “ ito yanagi ”; s . babylonica ), “ yamaneko yanagi ” ( synonym : “ bakko yanagi ”; s . bakko ), “ akame yanagi ” ( synonym : “ maruba yanagi ”; s . chaenomeloides ), “ koganeshidare ” ( s . chrysochoma ), s . daphnoides ( violet willow ), “ salikkusu elaeagunosu ” ( s . elaeagnos ‘ scopoli ’), “ pokkiri yanagi ” ( s . fragilis ), “ ookitsune yanagi ” ( synonym : “ kinme yanagi ”; s . futura ), “ kawayanagi ” ( synonym : “ nagaba kawa yanagi ”; s . gilgiana ), “ neko yanagi ” ( s . gracilistyla ), “ kuro yanagi ” ( s . gracilistyla var . melanostachys ), “ sause ” ( s . humboldtiana ), “ inukori yanagi ” ( s . integra ), “ shiba yanagi ” ( s . japonica ), “ shiro yanagi ” ( s . jessoensis ), “ kivu yanagi ” ( s . kinuyanagi ), “ kori yanagi ” ( s . koriyanagi ), “ ezo yanagi ” ( s . rorida ), “ furisode yanagi ” ( s . leucopithecia ), “ unryu yanagi ” ( s . matsudana f . tortuosa ), “ takaneiwa yanagi ” ( synonym : “ rengeiwa yanagi ”), “ ooshidare yanagi ” ( s . ohsidare ), “ ezomame yanagi ” ( s . nummularia ssp . pauciflora ), “ ezonokinu yanagi ” ( s . pet - susu ), s . purpurea ( purple willow ), “ kouhiryu ,” “ miyama yanagi ” ( synonym : “ mineyanagi ”; s . reinii ), “ komaiwa yanagi ” ( s . rupifraga ), “ onoe yanagi ” ( synonym : “ karafuto yanagi ”; s . sachalinensis ), “ kogome yanagi ” ( s . serissaefolia ), “ shirai yanagi ” ( s . shiraii ), salix sp , “ tachi yanagi ” ( s . subfragilis ), “ noyanagi ” ( synonym : “ himeyanagi ”), “ seiyotachi yanagi ,” “ kitsune yanagi ” ( synonym : “ iwayanagi ”; s . vulpine ), and “ ezonotakane yanagi ” ( s . yezoalpina ). preferred among these are plants in the genus salix of the family salicaceae ; and more preferred are salix daphnoides ( violet willow ), salix purpurea ( purple willow ), salix fragilis ( pokkiri yanagi ), and salix alba ( white willow ). these can be used singly or in a combination of two or more in the extraction . as the extraction site , buds ( including young branches ), leaves , branches , trunk , and bark of willow can be used singly or in any combination thereof . preferred among these are buds ( including young branches ) and bark . in the extraction , these extraction sites of willow can be preferably used after cutting , crushing , and grinding . further , the extract can be preferably subjected to drying and other treatments . examples of the willow extract include “ salicis cort extract ( produced by frutarom switzerland ltd . ),” which complies with the standards of the european pharmacopoeia and the german pharmacopoeia . specifically , a widely available extract is “ salicis cort extract ( produced by frutarom switzerland ltd . ),” which is an extract powder obtained by extracting bark and / or sprouts and young branches of one or more plants selected from the group consisting of salix purpurea , salix daphnoides , and salix fragilis , using water . willow is extracted using a solvent by still standing , shaking , or stirring under conditions such as ultrasonic irradiation , heating , or pressure still standing . these extraction methods and conditions can be freely combined , as required . as the extraction solvent to be used , an aqueous solvent and an organic solvent can be used as extractants , and they can be used singly or in combination . moreover , when supercritical fluid extraction is used , a supercritical fluid obtained by rendering a compound that is liquid or gas at ordinary temperature in a supercritical state is used . examples of organic solvents include lower alcohols , such as ethyl alcohol , propanol , isopropanol , and butanol ; polyhydric alcohols , such as polyethylene glycol , propylene glycol , 1 , 3 - butylene glycol , and dipropylene glycol ; ethyl acetate , butyl acetate , and like esters ; ketones , such as acetone and methyl ethyl ketone ; and supercritical fluids , such as carbon dioxide , methyl alcohol , and ammonia . in some embodiments , preferred examples of the extraction solvent include water , ethyl alcohol , and a mixture thereof . in some embodiments , water is used as the extraction solvent . the temperature of the extraction solvent during extraction ( extraction temperature ) is preferably 3 ° c . to the boiling point of the extraction solvent used , except for extraction using a supercritical fluid solvent or extraction under pressurized conditions . in general , extraction is preferably performed by heating at a temperature higher than room temperature . the hot water or boiling extraction time is suitably determined depending on , for example , the type of extraction solvent and the extraction temperature . the extract obtained by extraction as described above can be further subjected to various treatments , as necessary . examples of treatments include fraction , purification , concentration , drying , and the like . in the case of a powder or other solid form , dextrin , crystalline cellulose , corn starch , or like excipient can be added . the oleuropein used in the present invention is a polyphenolic substance , and is contained in a large amount in flowers , peel , fruit , leaves , bark , roots , or seeds , particularly leaves and fruit , of plants in the genus olea of the family oleaceae . products obtained by extracting these plants and further purifying the resulting extract to increase the oleuropein content can be preferably used . examples of plants in the genus olea of the family oleaceae that can be used in the extraction include olives ( olea europaea linne ) and congeners thereof ( e . g ., olea welwitschii and olea paniculata ). typical examples of these varieties include nevadillo blanco , manzanillo , picual , hojiblanca , arbequina , kalamata , koroneiki , picholine , paragon , wagga verdale , mission , washington , west australia mission , south australia vendor , azapa , barnea , cornicabra , gordal , frantoio , leccino , cipressino , lucca , ascolana tenera , correggiola , moraiolo , black italian , coratina , helena , rosciola , one seven seven , el greco , and hardy &# 39 ; s mammoth . synthesized oleuropein can also be used . olive extract obtained by extracting olive leaves , olive fruit , etc ., with a solvent , and optionally performing separation , purification , and other treatments , contains oleuropein , and can be preferably used in the present invention . the olive extract preferably has an oleuropein content of 15 mass % or more , more preferably 20 mass % or more , and even more preferably 30 mass % or more . on the other hand , when unrefined olive extract is used in the present invention , the oleuropein content may be low in some cases , and many components other than oleuropein may also be contained . therefore , when unrefined olive extract is used , it is preferably used within the range in which the effects of the present invention are exhibited , with care exercised for the oleuropein content . therefore , refined olive extract is preferably used . examples of the solvent used for extraction include water and ethanol , as well as light petroleum , hexane , butanol , propanol , methanol , polyethylene glycol , propylene glycol , butylene glycol , and a mixture of these solvents . preferred among these is water or a mixture of water and ethanol ( water - ethanol mixture ). the mixing ratio of water to ethanol in the water - ethanol mixture is , by volume ratio , preferably about 100 : 1 to 1 : 200 , more preferably about 20 : 1 to 1 : 20 , and most preferably about 1 : 9 to 1 : 1 . regarding the extraction method , the solvent temperature , the weight ratio of the solvent to the raw materials , or the extraction time can be freely determined for each of the various raw materials and the solvent used . the temperature of the solvent during extraction may be within the range of about − 4 ° c . to about 200 ° c ., and is preferably about 30 ° c . to about 150 ° c ., and more preferably about 40 ° c . to about 80 ° c . when olive leaves are used for extraction , it is preferable to use olive green leaves with a high oleuropein content . in particular , it is also preferable to use dried leaves obtained by drying green leaves . the drying method is not limited . for example , it is preferable to use olive leaves with a high oleuropein content obtained by the method disclosed in jp2003 - 335693a , etc . similarly , when olive fruit is used , oleuropein is generated in immature olive fruit , and starts to be accumulated therein ; and then , when the fruit is matured to the degree that its appearance is greenish yellow , the effect of increasing the amount of oleuropein accumulated tends to disappear . accordingly , it is preferable to use mature fruit . particularly preferred mature fruit has an appearance of green to greenish yellow color . preferred examples of the olive extract used in the present invention include olive leaf extract or olive fruit extract obtained by subjecting a solvent crude extracted solution of olive leaves or olive fruit to distillation , filtration , or like treatment to remove the solvent , then passing the resultant through a resin column filled with , for example , a styrene - divinylbenzene polymer resin ( diaion hp20 , produced by mitsubishi chemical ), amberlite xad resin ( produced by rohm and haas ), or duolite s resin ( produced by diamond shamrock ), to adsorb oleuropein , performing desorption , and concentrating the resulting solution under reduced pressure , followed by drying . as a result of these treatments , not only can the oleuropein content be increased 3 to 6 times higher than that of the crude extract , but also the mixing rate of other components can be significantly reduced . such raw materials having an increased oleuropein content are also commercially available . examples thereof include olive leaf dry extract ( produced by frutarom ; oleuropein content : 18 to 26 %), an olive leaf extract powder ( produced by biofronte ; oleuropein content : about 40 %), olive leaf extract ( produced by bio actives japan ; oleuropein content : about 25 %), opiace ( produced by eisai food & amp ; chemical co ., ltd . ; oleuropein content : about 35 %), and the like . the proportion of oleuropein in the obesity - suppressing composition of the present invention is not particularly limited . for example , it is preferably about 0 . 0005 to 30 mass %, and more preferably about 0 . 001 to 25 mass %. the lower limit is more preferably 0 . 005 mass % or more , and even more preferably 0 . 01 mass % or more . further , the amount of oleuropein in the obesity - suppressing composition of the present invention is not particularly limited , and can be suitably selected according to the embodiment so that it is preferably 30 to 130 mg , more preferably 30 to 110 mg , and even more preferably 30 to 70 mg . when the obesity - suppressing composition of the present invention is ingested , the amount of oleuropein ingested by an adult per day is not particularly limited , but can be suitably selected according to the embodiment so that it is preferably 30 to 130 mg , more preferably 30 to 110 mg , and even more preferably 30 to 70 mg . the hydroxytyrosol used in the present invention is one of the structure skeletons of oleuropein , and can be efficiently obtained by hydrolyzing oleuropein . since a large amount of oleuropein is contained in flowers , peel , fruit , leaves , bark , roots , or seeds , particularly leaves and fruit , of plants in the genus olea of the family oleaceae , hydroxytyrosol is generally obtained by hydrolyzing crude extract obtained by extracting plants in the genus olea , or extract treated to increase the oleuropein content , as described above , and optionally further performing separation , purification , and other treatments . olive extract before hydrolysis also contains hydroxytyrosol . olive extract containing a larger amount of hydroxytyrosol can be prepared by performing hydrolysis . examples of plants in the genus olea of the family oleaceae that can be used in the above extraction include olive ( olea europaea linne ) and congeners thereof ( e . g ., olea welwitschii and olea paniculata ). typical examples of these varieties are the same as described above , and include nevadillo blanco , manzanillo , picual , hojiblanca , arbequina , kalamata , koroneiki , picholine , paragon , wagga verdale , mission , washington , west australia mission , south australia vendor , azapa , barnea , cornicabra , gordal , frantoio , leccino , cipressino , lucca , ascolana tenera , correggiola , moraiolo , black italian , coratina , helena , rosciola , one seven seven , el greco , and hardy &# 39 ; s mammoth . synthesized hydroxytyrosol can also be used . olive extract obtained by extracting olive leaves , olive fruit , etc ., with a solvent , and optionally performing separation , purification , and other treatments , contains hydroxytyrosol in addition to oleuropein , and can be preferably used in the present invention . furthermore , an olive extract processed product obtained by hydrolyzing the olive extract by a known method , and optionally further performing separation , purification , and other treatments , contains a large amount of hydroxytyrosol , and can also be preferably used in the present invention . the olive extract or olive extract processed product preferably has a hydroxytyrosol content of 5 mass % or more , more preferably 10 mass % or more , and even more preferably 20 mass % or more . olive extract containing hydroxytyrosol can be prepared in the same manner as in the preparation of olive extract containing oleuropein described above . for example , the solvent used in the extraction , and the extraction method can be the same as those described above . moreover , the following olive extract processed products ( hydrolyzed products ) can also be preferably used in the present invention : an olive extract processed product obtained by subjecting a solvent crude extracted solution of olive leaves or olive fruit to distillation , filtration , or like treatment to remove the solvent , and performing hydrolysis by a known method , such as an acidic hydrolysis method , optionally followed by concentration ; an olive extract processed product obtained by passing the hydrolyzed product through a resin column to adsorb hydroxytyrosol , and then performing desorption ; and an olive extract processed product obtained by concentrating the extract obtained by desorption under reduced pressure , followed by drying , and optionally mixing the resultant with an excipient . the hydroxytyrosol content of the extract can be adjusted by these treatments ( particularly hydrolysis ). such raw materials containing hydroxytyrosol are also commercially available . examples thereof include olivex ht6 ( produced by grap &# 39 ; sud ; hydroxytyrosol content : about 6 %), olivex ceo10 ( produced by grap &# 39 ; sud ; hydroxytyrosol content : about 10 %), olive leaf extract ( produced by bio actives japan ; hydroxytyrosol content : about 7 %), oralis ( produced by eisai food & amp ; chemical co ., ltd . ; hydroxytyrosol content : about 20 %), and the like . as described above , the olive leaf extract powder ( produced by biofronte ) also contains about 40 % oleuropein . the proportion of hydroxytyrosol in the obesity - suppressing composition of the present invention is not particularly limited . for example , the proportion of hydroxytyrosol is preferably about 0 . 0001 to 25 mass %, and more preferably about 0 . 0005 to 20 mass %. the lower limit is more preferably 0 . 01 mass % or more , and even more preferably 0 . 05 mass % or more . further , the amount of hydroxytyrosol in the obesity - suppressing composition of the present invention is not particularly limited , but can be suitably selected according to the embodiment so that it is preferably 10 to 110 mg , more preferably 20 to 90 mg , and even more preferably 30 to 70 mg , when the obesity - suppressing composition of the present invention is ingested , the amount of hydroxytyrosol ingested by an adult per day is not particularly limited , but can be suitably selected according to the embodiment so that it is preferably 10 to 110 mg , more preferably 20 to 90 mg , and even more preferably 30 to 70 mg . the obesity - suppressing composition of the present invention can be used as an oral composition , such as a food and drink composition , an oral pharmaceutical composition , or an oral quasi - drug composition . examples of food and drink compositions include foods eaten for the purpose of weight loss , diet , or dietary therapy of diabetes , etc ., foods for specified health use , dietary supplements , functional foods , foods for elderly people , and the like . the form of the obesity - suppressing composition of the present invention is not particularly limited . when the obesity - suppressing composition is an oral composition , examples of its form include liquids , tablets , chewable tablets , foaming tablets , troches , drops , ( hard or soft ) capsules , granules , powders , drink powders ( prepared before use by dissolving the powder in a solvent , such as water , for drinking ), pills , dry syrups , infusions , decoctions , confections , chewing gum , syrups , beverages , spirits , oral disintegrators , gels / jellies , whips , sprays , pastes , sheets , pastes , gels ( e . g ., jellies ), and the like . when the oral composition is formed into a liquid , the best form is , for example , a two - agent type drink in which liquid and solid are separated , and mixed before drinking , in order to increase the stability of the active ingredient . the foods and drinks of the present invention are generally supplied as bottled foods and drinks . the bottled foods and drinks in the present invention refer to foods and drinks supplied for consumers in a state in which the obesity - suppressing composition of the present invention in the form of foods and drinks is filled and sealed in containers . the containers mentioned herein refer to glass bottles , synthetic resin bottles , sheet materials made of composites of synthetic resin , laminate materials , etc . ( e . g ., bags , easy - peel assemblies , and pouches ), paper containers , metal cans , ptp packages , and the like . in particular , when the obesity - suppressing composition of the present invention is an oral composition , the composition may contain known components generally used in foods , pharmaceuticals , etc ., other than oleuropein , hydroxytyrosol , willow extract , and sulforaphane , within a range that does not impair the effects of the present invention . for example , the composition may contain other components ( including foods as well as food additives ) generally added to foods , including conventionally known food additives , such as excipients , binders , emulsifiers , sweeteners , acidulants , fortifiers , dietary fiber , antioxidants , seasonings , fragrances , coloring agents , lubricants , and polysaccharide thickeners . such known components can be used singly or in a combination of two or more . examples of excipients include sugar alcohols , such as maltitol , xylitol , sorbitol , and erythritol ; crystalline cellulose , lactose , sucrose , glucose , dextrin , starch , carbonates , phosphates , and the like . examples of binders include gelatin , alginic acid , xanthan gum , cellulose , hydroxypropyl cellulose , methyl cellulose , carrageenan , pullulan , pectin , and the like . examples of emulsifiers include sucrose fatty acid ester , maltose fatty acid ester , lactose fatty acid ester , and like sugar fatty acid esters ; sorbitan fatty acid ester , fatty acid monoglyceride , polyoxyethylene sorbitan fatty acid ester , polyoxyethylene glycerol fatty acid ester , polyoxyethylene sorbit fatty acid ester , polyethylene sterol , alkyl glucoside , phospholipid , and like surfactants ; and starch solutions , gelatin solutions , hydroxypropyl cellulose , hydroxypropyl methylcellulose , hydroxyethyl cellulose , crystalline cellulose , powdered cellulose , carboxymethyl cellulose , methyl cellulose , ethyl cellulose , gum arabic powder , pullulan , pectin , dextrin , corn starch , pregelatinized starch , gelatin , xanthan gum , gellan gum , carrageenan , tragacanth , tragacanth powder , macrogol , and like polymers . these can be used singly or in a combination of two or more . examples of sweeteners include saccharin , sodium saccharin , acesulfame potassium , stevia extract , stevioside , sucralose , neohesperidyl dihydrochalcone , glycyrrhizin , perillatin , thaumatin , aspartylphenylalanine methyl ester , methoxycinnamic aldehyde , trehalose , erythritol , sorbitol , palatinose , palatinit , xylitol , maltose , lactitol , fructose , reduced palatinose , glucose , sugar , soft brown sugar , refined honey , unrefined honey , reduced starch syrup , starch syrup , isomerized sugar ( high - fructose corn syrup , etc . ), and the like . these sweeteners can be used singly or in a combination of two or more . examples of acidulants include fruit acids , such as citric acid , gluconic acid , malic acid , and tartaric acid ; acetic acid , lactic acid , phosphoric acid , succinic acid , glutamic acid , and the like . examples of fortifiers include vitamins , minerals , amino acids , animal and plant extract , peptides , and the like . dietary fiber can be water - soluble or water - insoluble . examples thereof include indigestible dextrin , cellulose ( pulp ), apple fiber , potato dextrose , psyllium , beet fiber , gum arabic , and the like . examples of antioxidants include dibutylhydroxytoluene , ascorbic acid , erythorbic acid , tocopherol , tea extract such as catechin and green tea polyphenol ; rutins , such as rutin ( extract ), quercetin , rutin enzyme - decomposed product , enzyme - treated rutin ( extract ), and enzyme - treated isoquercitrin ; enzyme - decomposed apple extract ; emulsifiers , such as sucrose fatty acid ester , sorbitan fatty acid ester , enzyme - treated lecithin , enzyme - decomposed lecithin , and saponin ; and the like . the obesity - suppressing composition of the present invention , particularly when orally taken , can improve physical conditions so that fat is easily decomposed , and can enhance the diet effect obtained by diet control or exercise . further , the effect of improving fat decomposition capacity under normal conditions can be obtained . accordingly , the present invention can be optimally used as , for example , diet foods , weight - reducing foods , foods for exercise therapy , obesity - treatment foods , and foods and drinks for persons with extremely low physical activity because of disease , motor dysfunction , advanced age , etc . the present invention can also be used as foods and drinks labeled with an indication that they are suitable for diet , beauty care , or obesity improvement . moreover , due to the effect of preventing the generation of hypertrophic adipocytes , the present invention can contribute to the prevention and improvement of obesity , diabetes , and various related diseases , and can also be used as oral compositions , pharmaceuticals , foods and drinks , etc ., for preventing and improving obesity , metabolic syndrome , diabetes , arteriosclerosis , abnormal glucose tolerance , hypertension , hyperlipidemia , hyper neutral lipemia , hypercholesterolemia , hepatic disease , and the like . furthermore , the present invention can also be used as oral compositions , pharmaceuticals , foods and drinks , etc ., for preventing and improving complications of obesity and diabetes , such as periodontal &# 39 ; diseases ( gingivitis and periodontitis ), and can also be used as oral compositions ( including foods and drinks ) labeled with an indication that they are suitable for preventing or improving the above diseases . the present invention is described in detail below ; however , the present invention is not limited to the following examples . hereinafter , “%” indicates “ mass %,” unless otherwise stated . the effect of suppressing fat droplet accumulation in adipocytes was evaluated using preadipocyte 3t3 - l1 cells . the 3t3 - l1 cells are isolated from mouse fibroblasts as cells accumulating fat . because they are immortalized cells , they can be mass - produced as fibroblasts before induction of differentiation . moreover , 95 % or more of 3t3 - l1 cells can differentiate into adipocytes by insulin , dexamethasone , and 3 - isobutyl - 1 - methylxanthine ( ibmx ). the passage media used were passage medium a ( dmem ( 4 . 5 g / l glu ), ( sigma , glucose , d5769 ), 10 % bs ( gibco , 16170 ), and 1 % antibiotic ( gibco , antibiotic - antimycotic , 15240 - 062 )) and passage medium b ( dmem ( 4 . 5 g / l glu ), 10 % fbs ( biowest , s1560 ), and 1 % antibiotic ). the differentiation - inducing medium used was prepared by adding a 10 - μg / ml insulin solution ( wako , 093 - 06351 ), 0 . 25 μm dexamethasone ( sigma , d4902 ), and 0 . 11 - mg / ml 3 - isobutyl - 1 - methylxanthine ( sigma , 15879 ) to passage medium b . the differentiation - promoting medium used was prepared by adding a 5 - μg / ml insulin solution to passage medium b . the differentiation - inducing medium and the differentiation - promoting medium were prepared before use . the oleuropein used was an “ oleuropein ” reagent available from sigma . in the experiment , the oleuropein was used in such an amount that the final concentration was 50 μm . the hydroxytyrosol used was a “ hydroxytyrosol ” reagent available from sigma . in the experiment , the hydroxytyrosol was used in such an amount that the final concentration was 25 μm . the willow extract used was a water extract ( dry powder ) of young branches including sprouts of willow ( a plant mixture containing at least one or more members selected from salix daphnoides , salix purpurea , salix fragilis , and salix alba ). in the experiment , the extract was diluted with the medium so that the final concentrations were 2 . 5 , 5 , 12 . 5 , 25 , 50 , 100 , and 200 μg / ml . the sulforaphane used was a “ sulforaphane ” reagent available from sigma . in the experiment , a 100 - mm dmso solution was prepared , and diluted with the medium . a 5 - mm γ - orizanol solution was prepared , and diluted with the medium . a necessary amount of 3t3 - l1 cells ( produced by sumitomo dainippon pharma co ., ltd . ; embryo mouse ) was grown in passage medium a . the cell suspension ( 1 ml ) was seeded in a collagen - coated culture plate ( produced by sumitomo bakelite co ., ltd . ; sumilon celltight c - 1 ) so that the concentration was 2 . 5 × 10 4 cells / well . the cells were cultured for 2 days at 37 ° c . in the presence of 5 % co 2 . thereafter , the medium was replaced with passage medium b . after confluent growth , culture was continued for about 2 days in passage medium b , and the medium was replaced with the differentiation - inducing medium ( day 0 ). within 48 hours after the differentiation of the cells was induced in the differentiation - inducing medium , the medium was replaced with the differentiation - promoting medium ( day 2 ). each sample was continuously added from the time of the replacement of the differentiation - inducing medium ( day 0 ) to day 7 or 8 . the samples were added according to the compositions shown in tables 1 to 4 . cold 10 % formalin / pbs was prepared by adding 10 % ( v / v ) formalin to pbs ( phosphate buffered saline ) and adjusting the ph to 7 . 4 , and then stored at 4 ° c . in this experiment , a 10 % neutral buffered formalin solution ( wako , 060 - 03845 ) was used . the stain solution used was a 0 . 5 % oil red o / isopropanol solution . oil red o ( wako , 154 - 02072 ) was dissolved in isopropanol ( sigma ) by shaking to prepare a saturated solution . the 0 . 5 % oil red 0 / isopropanol solution and distilled water were mixed at a ratio of 3 : 2 immediately before use ( preparation before use ). the 3t3 - l1 cells in the well plate cultured to day 7 or 8 by the above culture method were used . cold 10 % formalin / pbs ( 0 . 5 ml / well ) was added to the well plate containing the medium , and allowed to stand at room temperature . after the medium was removed , cold 10 % formalin / pbs ( 0 . 5 ml / well ) was newly added , and allowed to stand at room temperature . after the formalin solution was removed , the well plate was washed 2 or 3 times with distilled water ( 1 ml / well ) to completely remove the remaining distilled water . after the well plate was washed once with 60 % isopropanol ( 0 . 5 ml / well ), the filtered stain solution was added at 1 ml / well , and allowed to stand at room temperature . after staining , the well plate was washed once with 60 % isopropanol ( 0 . 5 ml / well ), and washed 2 or 3 times with distilled water ( 1 ml / well ). the resultant was dissolved in 100 % isopropanol ( 0 . 5 ml / well ), the plate side was wrapped with parafilm , and extraction was performed while gently shaking at 20 ° c . for 20 minutes . the eluted isopropanol solution was measured by a microplate reader at od 490 nm . the measurement results were shown as values relative to the amount of fat accumulation in adipocytes in a medium to which nothing was added , which was regarded as 100 . tables 1 to 4 show the results . as shown in tables 1 and 2 , when the amount of fat accumulation in adipocytes in a medium to which nothing was added was regarded as 100 ( comparative example 8a ), the relative amount of fat accumulation in adipocytes cultured in media to which 50 μm of oleuropein and 0 . 5 to 1 . 25 μm of sulforaphane were each added was around 100 . these results were almost the same as the amount of fat accumulation in the control . when willow extract was added ( 61 . 9 ; comparative example 4a ), or when γ - orizanol was added ( 51 . 4 ; comparative example 6a ), the amount of fat accumulation in each case was less than that of the control ( comparative example 8a ). in contrast , when oleuropein and sulforaphane were added in combination , the amount of fat accumulation was 79 . 6 to 74 . 0 at a sulforaphane concentration of 0 . 5 to 1 . 25 μm . thus , the effect of suppressing fat accumulation was confirmed . it was also found that the fat accumulation effect could be enhanced by using willow extract in combination with oleuropein , which alone had no effect . on the other hand , the combined use of oleuropein with γ - orizanol , which had a high fat accumulation - suppressing effect , did not enhance the fat accumulation - suppressing effect . these results demonstrate that fat accumulation in adipocytes could be significantly suppressed by using willow extract or sulforaphane in combination with oleuropein . furthermore , as shown in tables 3 and 4 , when the amount of fat accumulation in adipocytes in a medium to which nothing was added was regarded as 100 ( comparative example 1b ), the relative amount of fat accumulation in adipocytes cultured in media to which each component was added was as follows . when 25 μm of hydroxytyrosol , or 0 . 25 or 2 . 5 μm of sulforaphane was added , the amount of fat accumulation was around 100 in all cases . these results were almost the same as the amount of fat accumulation in the control ( comparative example 1b ). when 37 . 5 μm of hydroxytyrosol , 12 . 5 μg / ml of willow extract , or 0 . 5 μm of γ - orizanol was added , the amount of fat accumulation was 75 to 80 in all cases ; their accumulation - suppressing effects were about 25 % higher than that of the control . in contrast , when hydroxytyrosol and sulforaphane were added in combination , their suppressing effects were 20 to 30 % higher , even when they were combined at a concentration in which hydroxytyrosol and sulforaphane alone exhibited no fat accumulation effect . moreover , when 37 . 5 μm of hydroxytyrosol , 12 . 5 μg / ml of willow extract , or 0 . 5 μm of γ - orizanol was added , their fat accumulation - suppressing effects were about 25 % higher than that of the control . however , when these components were added in combination , the combination of hydroxytyrosol and willow extract showed about a 50 % suppressing effect ; whereas the combination of hydroxytyrosol and γ - orizanol showed 76 . 7 , which was the same as the suppressing effect of the individual components . thus , the combined use of hydroxytyrosol and γ - orizanol did not enhance the fat accumulation - suppressing effect . these results demonstrate that fat accumulation in adipocytes could be suppressed by using willow extract or sulforaphane in combination with hydroxytyrosol . the formulation of the examples of the obesity - suppressing compositions ( particularly oral compositions ) according to the present invention is described below ; however , the present invention is not limited to the following formulation examples . the amounts indicated are mass %, unless otherwise stated . 30 g per pack is dissolved in 500 ml of water for drinking . for each drink , the amount of oleuropein is 54 mg , and the amount of sulforaphane is 0 . 6 mg . 30 g per pack is dissolved in 500 ml of water for drinking . for each drink , the amount of oleuropein is 42 mg , and the amount of sulforaphane is about 0 . 4 mg . 30 g per pack is dissolved in 500 ml of water for drinking . for each drink , the amount of oleuropein is about 110 mg , and the amount of sulforaphane is 1 . 8 mg . 2 g per pack is dissolved in 150 ml of water for drinking . for each drink , the amount of oleuropein is 30 mg , and the amount of sulforaphane is 0 . 5 mg . 2 g per pack is dissolved in 150 ml of water for drinking . for each drink , the amount of oleuropein is 52 . 2 mg , and the amount of sulforaphane is 0 . 8 mg . 2 g per pack is dissolved in 150 ml of water for drinking . for each drink , the amount of oleuropein is 70 mg , and the amount of sulforaphane is 0 . 6 mg . subdivided packs each containing 5 baked goods ( 10 g / piece ). for each pack , the amount of oleuropein is 100 mg , and the amount of sulforaphane is 1 mg . subdivided packs each containing 5 baked goods ( 10 g / piece ). for each pack , the amount of oleuropein is 130 mg , and the amount of sulforaphane is 1 mg . subdivided packs each containing 5 baked goods ( 10 g / piece ). for each pack , the amount of oleuropein is about 100 mg , and the amount of sulforaphane is 1 mg . functional food eaten by taking 3 gelatin hard capsules each containing 150 mg at a time . for each intake , the amount of oleuropein is about 110 mg , and the amount of sulforaphane is about 0 . 7 mg . functional food eaten by taking 3 gelatin hard capsules each containing 150 mg at a time . for each intake , the amount of oleuropein is 99 mg , and the amount of sulforaphane is about 1 mg . functional food eaten by taking 3 gelatin hard capsules each containing 150 mg at a time . for each intake , the amount of oleuropein is about 70 mg , and the amount of sulforaphane is 0 . 9 mg . functional food eaten by taking 2 tablets obtained by tableting 200 mg of the above composition at a time . for each intake , the amount of oleuropein is about 70 mg , and the amount of sulforaphane is 0 . 8 mg . functional food eaten by taking 2 tablets obtained by tableting 200 mg of the above composition at a time . for each intake , the amount of oleuropein is about 70 mg . functional food eaten by taking 2 tablets obtained by tableting 200 mg of the above composition at a time . for each intake , the amount of oleuropein is about 30 mg , and the amount of sulforaphane is about 0 . 7 mg . subdivided packs of chocolate containing 20 g of the above composition . for each pack , the amount of oleuropein is 52 . 2 mg , and the amount of sulforaphane is 1 . 2 mg . subdivided packs of chocolate containing 20 g of the above composition . for each pack , the amount of oleuropein is 70 mg , and the amount of sulforaphane is 1 . 2 mg . subdivided packs of chocolate containing 20 g of the above composition . for each pack , the amount of oleuropein is 77 mg , and the amount of sulforaphane is 0 . 8 mg . 30 g per pack is dissolved in 500 ml of water for drinking . for each drink , the amount of hydroxytyrosol is 21 mg , and the amount of sulforaphane is about 0 . 42 mg . 30 g per pack is dissolved in 500 ml of water for drinking . for each drink , the amount of hydroxytyrosol is 24 mg , and the amount of sulforaphane is 0 . 6 mg . 30 g per pack is dissolved in 500 ml of water for drinking . for each drink , the amount of hydroxytyrosol is about 31 mg , and the amount of sulforaphane is about 1 mg . 2 g per pack is dissolved in 150 ml of water for drinking . for each drink , the amount of hydroxytyrosol is 10 mg , and the amount of sulforaphane is 0 . 5 mg . 2 g per pack is dissolved in 150 ml of water for drinking . for each drink , the amount of hydroxytyrosol is 15 mg , and the amount of sulforaphane is 1 mg . 2 g per pack is dissolved in 150 ml of water for drinking . for each drink , the amount of hydroxytyrosol is 40 mg , and the amount of sulforaphane is 0 . 3 mg . subdivided packs each containing 5 baked goods ( 10 g / piece ). for each pack , the amount of hydroxytyrosol is 69 mg , and the amount of sulforaphane is 1 mg . subdivided packs each containing 5 baked goods ( 10 g / piece ). for each pack , the amount of hydroxytyrosol is 90 mg , and the amount of sulforaphane is 1 mg . subdivided packs each containing 5 baked goods ( 10 g / piece ). for each pack , the amount of hydroxytyrosol is 110 mg . functional food eaten by taking 3 gelatin hard capsules each containing 150 mg at a time . for each intake , the amount of hydroxytyrosol is 18 mg , and the amount of sulforaphane is about 0 . 8 mg . functional food eaten by taking 3 gelatin hard capsules each containing 150 mg at a time . for each intake , the amount of hydroxytyrosol is 45 mg , and the amount of sulforaphane is 0 . 45 mg . functional food eaten by taking 3 gelatin hard capsules each containing 150 mg at a time . for each intake , the amount of hydroxytyrosol is 81 mg . functional food eaten by taking 3 tablets obtained by tableting 200 mg of the above composition at a time . for each intake , the amount of hydroxytyrosol is 90 mg . functional food eaten by taking 2 tablets obtained by tableting 200 mg of the above composition at a time . for each intake , the amount of hydroxytyrosol is 20 mg , and the amount of sulforaphane is 0 . 48 mg . functional food eaten by taking 3 tablets obtained by tableting 200 mg of the above composition at a time . for each intake , the amount of hydroxytyrosol is 72 mg . subdivided packs of chocolate containing 20 g of the above composition . for each pack , the amount of hydroxytyrosol is 32 mg , and the amount of sulforaphane is 0 . 16 mg . subdivided packs of chocolate containing 20 g of the above composition . for each pack , the amount of hydroxytyrosol is 40 mg , and the amount of sulforaphane is 0 . 8 mg . subdivided packs of chocolate containing 20 g of the above composition . for each pack , the amount of hydroxytyrosol is 60 mg , and the amount of sulforaphane is 0 . 4 mg .
an object of the present invention is to provide an obesity - suppressing composition that suppresses fat accumulation in adipocytes and that has an effect of suppressing body weight gain . the present invention provides an obesity - suppressing composition comprising the following components and : at least one member selected from the group consisting of oleuropein and hydroxytyrosol ; at least one member selected from the group consisting of sulforaphane compounds and willow extract .