GCSE Biology - Nutrition - Carbohydrates | Lipids | Proteins | Vitamins | Minerals (2026/27 exams)

This video introduces the biological molecules and nutrients essential for a healthy diet, including carbohydrates, lipids, proteins, vitamins, mineral ions, fiber, and water. It emphasizes that most foods contain a mix of different nutrients, not just one, using wholemeal bread as an example.

Carbohydrates, found in starchy foods, fruits, and vegetables, are primarily an energy source. Lipids (fats and oils), found in oily fish, nuts, dairy, and avocados, provide long-term energy storage, insulation, and organ protection. Proteins, abundant in nuts, seeds, meat, fish, and legumes, are crucial for growth and tissue repair, serving as an emergency energy source.

Vitamins are organic molecules needed in small amounts, such as Vitamin A for vision, C for preventing scurvy, and D for calcium absorption. Mineral ions are inorganic molecules; calcium, found in dairy and leafy greens, is vital for strong bones. Iron, from red meat and spinach, is essential for hemoglobin and oxygen transport, with deficiency leading to anemia.

Fiber, a type of carbohydrate not absorbed by the body, is found in wholemeal foods, fruits, and vegetables. It aids in digestive health, preventing constipation and diarrhea. Water, obtained from drinks and most foods, makes up about 70% of the body and is essential for chemical reactions and replacing continuous loss through breathing, sweating, and urination.