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.
PU is short for polyurethane. This is a food safe and rubbery textile that is made from a foamy-like plastic. It's a material used for food trays and other products you serve food on. However it doesn't hold up well and can warp when heated in just the hottest of running water.