This article reveals a mistaken idea in child-raising which deserves correcting.Most parents take it for granted that children should eat more animal foods such as chicken,meat and fish than grain foodbecause the former are far more expensive and the more expensive the food is the more nutritious it is. However, this is, in fact, a mistaken ideawhich has lead to malnutrition among many city kids.This is indicated in a survey recently made in Shanghai.What parents don’ t know is that carbohydrate in grains, starch and sugar, the main and most inexpensive nutrient for energy supply, is of equal importance in metabol ism.The energy it supplies is the main source of calories in human bodies,about 60% of the total amount of calories.