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Nutrients are absorbed in the small intestine, specifically in the duodenum, jejunum, and ileum. The small intestine is lined with villi and microvilli, which are small, finger-like projections that increase the surface area of the intestine and allow for greater absorption of nutrients.As food enters the small intestine, it is mixed with enzymes and secretions from the pancreas and liver. These enzymes and secretions break down the food into smaller molecules that can be absorbed by the body. The villi and microvilli then absorb these molecules, including carbohydrates, proteins, and fats, into the bloodstream.Vitamins and minerals also get absorbed in the small intestine. For example, Vitamin B12 which is found in animal-based foods, need a protein called intrinsic factor, produced by stomach to get absorbed. Iron which is found in food, can be in two forms, heme and non-heme iron. Heme iron is found in meat, poultry, and fish and is well absorbed, while non-heme iron is found in plant-based foods and is less well absorbed.The small intestine also absorbs water and electrolytes, which are important for maintaining proper hydration and electrolyte balance in the body.However, not all nutrients are absorbed in the small intestine. Fibers are not digested and absorbed in the small intestine, but instead, they pass into the large intestine where they are fermented by gut bacteria. These bacteria produce short chain fatty acids which are then absorbed in the large intestine and provide energy to the body.In summary, the small intestine plays a critical role in nutrient absorption, breaking down food and absorbing essential nutrients, vitamins, minerals, water, and electrolytes into the bloodstream. It's important to maintain a healthy small intestine for optimal nutrient absorption and overall health.