Animal fats are made of triglycerides which have mostly saturated fatty acids.

动物脂肪由甘油三酯组成，其中大部分含有饱和脂肪酸。

This is because sebum is composed of both saturated and unsaturated fatty acids.

因为皮脂是由饱和脂肪酸和非饱和脂肪酸共同组成的。

In the context of a super low carb high-fat ketogenic diet, dietary fat will actually decrease blood levels of saturated fatty acids.

当采用低碳水高脂饮食时，膳食脂肪实际上会降低血液中的饱和脂肪酸水平。