No more than one third of our daily energy intake should come from fats. There are two main types of fat: Saturated and Polyunsaturated. Polyunsaturates are healthier as saturated fat can block up arteries and lead to heart disease.

Function.
Needed for energy, insulation and fat helps to protect our major organs.

Sources.
Butter, margarine, milk, nuts, vegetable oil, meat and fried foods.