城市也往往促进不健康的生活方式，例如依赖于富含脂肪和糖但缺少必要营养素的加工食品的廉价和方便饮食。
Cities also tend to promote unhealthy lifestyles, like cheap and convenient diets that depend on processed foods rich in fats and sugar, yet low in essential nutrients.
但是对使用这些微量营养物质促进免疫的兴趣在抗生素推广之后就减弱了。
But interest in using these micronutrients to boost immunity waned with the introduction of antibiotics.
这些脂肪物质可以促进可溶性维生素的吸收，成为营养的获取途径。
These fats served as a vehicle for nutrients, by promoting absorption of fat-soluble vitamins.
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