A relatively small number of foods, however, contain concentrated amounts of purines. For the most part, these high-purine foods are also high-protein foods, and they include organ meats like kidney, fish like mackerel, herring, sardines and mussels, and also yeast. 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.