What are carbohydrates, and why do we need them? Learn how our bodies use carbs, how many we should eat each day, and which foods are healthier choices for carbs than others. Begin to understand the role of glucose, fructose, sucrose, lactose and other sugars in the diet. Learn why people who go on carb-reducing diets lose weight and why carbohydrates are a more efficient fuel than protein. Also, get important facts about blood sugar, insulin, diabetes, and the glycemic index.