Question

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Not until the beginning of the twentieth century was it recognized that certain substances were essential in the diet to prevent or cure some disease.These substances are now known as vitamins.They are vital for growth,good health,and maintenance of the normal functions of the body.
A well-balanced diet should provide all the vitamins we normally require.Those of us who are fortunate enough to be able to buy sufficient food should not suffer from vitamin deficiency.However,for various reasons,some people do not maintain a balanced diet.People often lose their appetite because of illness.People living alone may not bother to eat proper meals.and people on a diet may not eat sufficient quantities of necessary foods.

Answer 1

直到二十世纪之初才意识到在日常饮食中有一些固定物质成分对防疫和治疗各种疾病至关重要。这些物质就包括我们常说的维他命，它对我们的成长，增强体质，以及维护人体正常机能起了极其重要的作用.
平衡膳食需要提供我们平常所需的维他命，那些通过买充分的食物来补充维他命的人很幸运。但是，由于种种原因，许多人没有得到很好的平衡膳食；人们常常由于生病而没有食欲，还有那些独自生活的人们没有很合适的保证饮食，以及人们在吃饭的时候没有补充到高质量的必需食物！