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这里的有些同学走极端了,脂肪是人类必须的营养成分之一,在人体的生理过程中有着不可替代的作用。
脂肪的重要性:
脂肪是人体细胞的基本建筑材料,其作用犹如摩天大厦中的钢制骨架;
脂肪还有助于基本维生素和植物养分的吸收;
科研新发现认为,食物脂肪对钙的吸收有影响;
脂肪还是激素和胆固醇的原材料;
α-亚麻酸和亚油酸是人类食品中必不可少的两种脂肪酸,在细胞膜的结构中和调解免疫、心瓣膜和生殖系统方面发挥着重要作用;
尤其是小孩子。如果摄入量不足会影响发育的
摄入量建议:
* Total fat intake should be between 20 and 35 percent of total calories.
* Less than 10 percent of calories should come from saturated fats, such as those found in animal products (meat and full-fat dairy).The American Heart Association recommends we consume less than 7 percent of calories from saturated fat.
* Most fat should come from monounsaturated or polyunsaturated sources (for instance, fish, nuts, canola and olive oils and spreads.
* We should keep consumption of trans fats as low as possible (anything that says hydrogenated or partially hydrogenated on the label). The American Heart Association recommends a trans-fat intake of less than 1 percent.
* We should consume less than 300mg of cholesterol a day
* Meat, poultry and dairy selections should be lean, low fat or fat free.
* We should consume no more than 6 teaspoons of oils a day (cooking oils, and those in salad dressings and mayonnaise). |
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