But the scientific reason why avocados make sense as an aphrodisiac is that they are rich in unsaturated fats and low in saturated fat, making them good for your heart and your arteries.
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.
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。
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Doctors have been advising people to eat more fish for years, because they are high in healthy fats and low in unhealthy fats compared to beef and pork.