英语翻译not until beginning of the twentieth century was it reco

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英语翻译
not until beginning of the twentieth century was it recognized that certain substances were essential in the diet to prevent or cure come 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,people on a diet may not eat sufficient quantities of necessary foods.

直到20世纪,人们才认识到饮食中有某一种物质对预防或治愈疾病是必须的.我们现在知道这些物质就是维生素.它们对身体成长、健康和维持正常机能是必不可少的.均衡的饮食可以给我们提供所有正常需求的维生素.我们中的幸运者有能力购买足够的食物,他们不会遭受缺乏维生素之苦.然而,由于各种原因,一些人无法维持一个均衡的饮食.人们经常会因病而没胃口.独自居住的人可能会因怕烦而不吃合适的膳食.节食的人可能不会吃足够量的必要食物.
感觉这句有误：people living alone may not bother to eat proper meals

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