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.
An average daily diet contains approximately 600 to 1,000 milligrams of purines, according to health care provider Litholink. A low-purine diet restricts purine intake to between 100 and 150 milligrams per day. High-purine foods, which contain between 100 and 1,000 milligrams of purine per 3-ounce serving, include anchovies, bacon, codfish, herring, haddock, mussels, sardines, scallops, shrimp, veal, venison and organ meats.