The analysis of 72 previous studies showed insufficient support for nutritional recommendations that advocate high consumption of polyunsaturated fats like omega-3 and omega-6.

They are considered essential, but the body cannot make them. They are found in numerous foods, but Americans, two thirds of whom are obese, fail to eat enough of them.

Environmental stress plays an important role in the development of glucose intolerance influencing lipid and glucose metabolism through sympathetic nervous system, cytokines and hormones such as glucocorticoids, catecholamines and glucagon. Otherwise, fish oil prevents glucose intolerance and insulin resistance.