Mackerel, tuna, sardines and salmon are foods to help prevent diabetes

Fish and other meats do not have GI scores because they do not contain carbohydrates.

However, cold-water fish may help manage or prevent diabetes better than other types of meat.

A 2014 studyTrusted Source included data taken from 33,704 Norwegian women over a 5-year period. The researchers found that eating 75–100 grams of cod, saithe, haddock, or pollock daily reduced the risk of developing type 2 diabetes.

However, the researchers were uncertain whether the reduction in risk was a direct result of eating the fish or whether other healthful lifestyle factors, such as exercise, could have influenced the findings.