<unk>  is the synthesis and degradation of<unk> s in cells, involving the breakdown or storage of fats for energy and the synthesis of structural and functional<unk> s, such as those involved in the construction of cell membranes. In animals, these fats are obtained from food or are synthesized by the liver. Lipogenesis is the process of synthesizing these fats. The majority of<unk> s found in the human body from ingesting food are triglycerides and cholesterol. Other types of<unk> s found in the body are fatty acids and membrane<unk> s.<unk>  is often considered as the digestion and absorption process of dietary fat; however, there are two sources of fats that organisms can use to obtain energy: from consumed dietary fats and from stored fat. Vertebrates (including humans) use both sources of fat to produce energy for organs such as the heart to function. Since<unk> s are hydrophobic molecules, they need to be solubilized before their metabolism can begin.<unk>  often begins with hydrolysis, which occurs with the help of various enzymes in the digestive system.<unk>  also occurs in plants, though the processes differ in some ways when compared to animals. The second step after the hydrolysis is the absorption of the fatty acids into the epithelial cells of the intestinal wall. In the epithelial cells, fatty acids are packaged and transported to the rest of the body.
Lipid metabolism
Fatty acid metabolism
Drug metabolism
Ethanol metabolism
Purine metabolism
Glucose uptake
Immune cycle
Pyrimidine metabolism