要靠食物供给维生素多半不能由人体制造，要靠食物供给，因此要提倡平衡膳食，使各种维生素都不缺乏。除此之外，食物的加工和烹饪方法也很重要。有的人喜欢吃捞米饭，而把米汤倒掉，这样损失就大了。有人做过实验，倒掉米汤所损失的维生素B1、B2和维生素PP可高达40%左右。蔬菜 To rely on food supply most of the vitamins can not be manufactured by the body, rely on food supply, so to promote balanced diet, so that a variety of vitamins are not lacking. In addition, food processing and cooking methods are also important. Some people like to eat fishing rice, but the rice soup drained, so the loss is big. Someone has done experiments, the loss of rice soup lost vitamin B1, B2 and vitamin PP can be as high as 40%. vegetables