食物中的脂肪或油分提供身體需要的脂肪酸，並協助吸收脂溶性維生素，如維生素 A 、 D 、 E 和 K 。糖和鹽則為身體分別提供熱量和鈉質。雖然三者均是身體所需，但不宜在日常飲食中進食太多。

The fats and oils in food can provide the fatty acids needed by the body and help absorb fat-soluble vitamins, such as vitamins A, D, E, and K. Sugar and salt provide the body with calories and sodium, respectively. Although these three are essential to the human body, it is recommended not to eat too much in the daily diet.