The reason that unsaturated fats are better is down to the molecular structure of fat. Saturated fat molecules form regular shapes that clump together easily; unsaturated fat molecules however, form irregular shapes that cannot clump together so easily. Saturated fat is therefore more likely to stick to the sides of arteries and allow other saturated fat molecules to build up; this can gradually clog the arteries leading to higher blood Cholesterol is a type of fat found in the blood. Nearly all the cholesterol in the body is produced by the liver, very little is found in foods although seafood, liver, kidney and eggs do contain some cholesterol. Cholesterol is vital in the body, not only does it play a role in how all cells work but it is also a ‘building block’ for other essential chemicals that the body produces.