How many different forms of lipids are commonly found in food?

Fats make up the largest category of lipids and also go by the terms triacylglycerols, triglycerides, and glycerolipids. There are several types of fats. Saturated fat is a lipid that exists as a solid substance when it is at room temperature. Milk, cheese, meat, and other animal foods contain saturated fat.

It is evolution, because we all have some of the same traits like eye color or shape or ears.