Having some fat in our diet helps the body absorb some vitamins. Fat is a good source of energy and it provides essential fatty acids that the body can't make itself. But eating lots of fat can make you more likely to put on weight because foods that are high in fat are also high in energy (calories). And eating a diet that is high in saturated fat can raise the level of cholesterol in your blood, over time, which increases your chance of developing heart disease. So it’s important to try to eat less fat and go for foods that are rich in unsaturated fats instead of saturated. You can find out more about the different types of fat in this section.