Carbohydrates are one of the main types of nutrients. Your digestive system changes carbohydrates into glucose (blood sugar). Your body uses this sugar for energy for your cells, tissues and organs. It stores any extra sugar in your liver and muscles for when it is needed. There are two types of carbohydrates: simple and complex. Simple carbohydrates include natural and added sugars. Complex carbohydrates include whole grain breads and cereals, starchy vegetables and legumes.
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