Consider starch and fiber, both polysaccharides, both derived from plants, both composed of hundreds to thousands of monosaccharides joined together, but they're joined together differently, and that changes the effect  they have on your body.
Considere o amido e a fibra, ambos polissacarídeos, ambos derivados de plantas, ambos compostos de centenas de milhares de monossacarídeos unidos, mas são unidos de forma diferente, e isso muda o efeito que exercem no seu corpo.