Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation.
Omega-3 Fatty Acids. A diet rich in PUFAs should include plenty of omega-3 fatty acids. This type of PUFA is found in cold-water fish, such as salmon, tuna, mackerel and herring.
Foods that contain purines. Because uric acid is formed from the breakdown of purines, low-purine diets are often used to help treat conditions like gout in which excessive uric acid is deposited in the tissues of the body. 3.5 ounce serving of some foods, all by itself, can contain up to 1,000 milligrams of purines. These foods include anchovies, herring, kidney, liver, mackerel, meat extracts, mincemeat, mussels, sardines, and yeast.