Activity A: Identifying nutrients Introduction: Most food is composed of three types of molecules: carbohydrates, proteins, and lipids. Carbohydrates such as starches and sugars are major source of energy. Simple sugars are found in sweets and fruits. Starches are found in potatoes, cereal, pasta, flour, and other plant products. Proteins are used in body structures such as muscles, skin, and hair. Rich sources of proteins include meats, dairy products, and beans. Lipids (fats and oils) are used for energy, insulation, and as an essential building block of cells. Meats, dairy products, and oily plants such as olives are rich in lipids. Get the Gizmo ready: Step 1: Click Reset. Step 2: Drag Sample A into the Food sample holder What kind of food is sample A most likely to be