A carbohydrate, or “carb,” is a macronutrient that provides energy. Macronutrients are special nutrients your body requires in large amounts to function. The other two main macronutrients are fats and ...
What is the immune system? The immune system protects your child's body from outside invaders. These include germs such as bacteria, viruses, and fungi, and toxins (chemicals made by microbes). The ...