“Human Nutrition: Cells and Macronutrients” introduces the science of nutrition by explaining how the body gets and uses nutrients for energy, growth, and repair. The video connects food energy to photosynthesis and the sun, then defines essential nutrients, macronutrients, and micronutrients. Key concepts include carbohydrates, fats, proteins, calories and kilocalories, cells as the basic unit of life, and the roles of water, vitamins, and minerals. It explains simple and complex carbohydrates, glucose, fiber, saturated and unsaturated fats, omega-3 fatty acids, cholesterol, amino acids, and complete proteins. The content supports life science and health curricula by linking nutrition, cellular function, digestion, body systems, and informed food choices using academic vocabulary and standards-aligned concepts. Part of the "Human Nutrition" series.