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Since much of the human body is water, foods must be digested in an aqueous solution. This presents a problem for fats that are not water soluble. To aid fat digestion, the body breaks down fat by first using emulsifiers that help suspend it in a liquid, and then using enzymes that break it down. Once it is broken down, fat can be absorbed and distributed to the various parts of the body.

Normally, digestion starts in the mouth as enzymes in saliva start to break food down. This process is not as effective for fat, which instead is sent down to the stomach largely unchanged. In the stomach, food usually mixes with gastric juices and is transformed intochyme. Again, the watery solution of the stomach is not conducive to breaking down fat, and so true digestion doesn't take place until it reaches the small intestine.

There are two organs in the body that secrete substances essential to fat digestion: the liver and the pancreas. The pancreas secretes lipase, a substance that breaks down food, including fat, and the liver secretes bile, a substance that emulsifies fat. Without bile, the lipase would not be able to digest fat efficiently. When food enters the small intestine, lipase is secreted into the area via the main pancreatic duct through the hepatopancreatic ampulla. It then breaks down food into simpler particles.

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10y ago
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Q: What substances help to digest fat?
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