This tradition originates from the MISC@1 period when the population of Edo -LRB- LOCATION@1 -RRB- , being considerably wealthier than the rural poor , were more susceptible to beri beri due to their high consumption of white rice , which is low in thiamine .

At that time , the population of MISC@2 -LRB- LOCATION@1 -RRB- was considerably wealthier than the rural poor , were more susceptible to beri beri because of their high consumption of white rice which is low in thiamine .
