人体所需热量的20～30%来自膳食中的脂肪.其中饱和脂肪不应超过1/3,否则容易引起高脂血症以及动脉硬化或心血管病.故中老年尤其需注意食油的选择.食油可分三类:饱和脂肪酸油脂,如猪油、牛油、羊油、黄油等;单不饱和脂肪油脂,如花生油、菜子油等;多不饱和酸油脂,如葵花子油、豆油、棉子油、芝麻油、亚麻油等. 20 ~ 30% of calories required by the body from fat in the diet, of which saturated fat should not exceed 1/3, otherwise easily lead to hyperlipidemia and atherosclerosis or cardiovascular disease, so in particular the elderly should pay attention to the choice of cooking oil. Edible oil can be divided into three categories: saturated fatty acid fats, such as lard, butter, suet, butter, etc .; monounsaturated fats, such as peanut oil, rapeseed oil; polyunsaturated acid fats such as sunflower oil, soybean oil, Oil, sesame oil, linseed oil and so on.