1. Carbohydrates: These are the body's primary source of energy. They are made up of carbon, hydrogen, and oxygen. Examples include sugars, starches, and fiber.
2. Lipids (Fats): These provide long-term energy storage, insulation, and protection for organs. They are also components of cell membranes. Examples include triglycerides, phospholipids, and steroids.
3. Proteins: These are essential for building and repairing tissues, enzymes, hormones, and antibodies. They are made up of amino acids. Examples include muscle tissue, collagen, and hemoglobin.
4. Nucleic Acids: These store and transmit genetic information. They are made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base. Examples include DNA and RNA.
