• Just like carbohydrates, lipids are energy sources, usually when carbohydrates are short supply. 1g of carbohydrates contains about 37g of energy as compare to 17kg found in 1g of carbohydrates. This is because lipids have a high proportion of hydrogen and almost insignificant proportion compared to carbohydrates. Fats are more of storage materials than energy suppliers. This is because they are compact and insoluble, thereby providing a convinent form in which energy can be preserved and used when necessary
• Fats can be stored beneath the skin and in other part of the body where it can be withdrawn and wed as energy suppliers
• Lipids can be used as structural materials. There serve as structural compound of the cell membrane, in the case, fats combine with phosphoric acid to form phospholipids
• Lipids combine with proteins to form glycoprotein which are common in the plasma membrane
• Glycolipids are lipids attached to carbohydrates molecules, they are also common in the cell membrane
• Fats protects certain delicate orgeins in the body such kidney, hearts and eye. Where they act as shock absorbant
• Lipids helps to store and transport fat soluable vitamin such as vitamin A, F and K
• Some aquatic animal produce oil droplet which help them in buoganey

Fats can be stored in the seeds of some plants such as groundnut, catol, etc….