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The High starch high glucose diet is another important cause of low testosterone. It s one of the reason that low testosterone is a strong predictor of Type 2 Diabetes Mellitus. There is a vicious circle of the High starch diet, such as proposed by most fast food outlets and T2DM, Obesity, Low Testosterone, Brain Atrophy, Hyperglycaemia, heart disease, neuropathies, and even depression. A first thing any police officer should do is to minimize starchy foods in the diet. Digestible starches (amylose and amylopectin) are pure glucose, they are glucose polymer chains. We don’t need carbohydrates to survive, they are an economic luxury of low-cost/high-energy foods but with very little nutrient density, fruits having the most nutrients, and starches the lowest, amongst carbohydrate rich foods (Starches, flours from cereals, score the lowest of all other foods in terms of nutrient density). They were incorporated in the human diets at the beginning of the agricultural organization when humans shifted from a nomadic way of life to a sedentary one some 12,000 years ago. They were appreciated because of their low-cost/high-energy density…not because of their nutrient density. With leafy greens, who are very low-energy/high-nutrient density, their carbohydrate content are mostly fibers (non digestible saccharides, or other complex saccharides). In fact, excessive starchy diets also have a strong chelating effect, this means that the natural chelators (such as phytic acid) found in cereal grains attract nutritional metals such as iron, copper, zinc, etc…a deficiency in zinc is an etiological characteristic of Type 2 Diabetes. This is the reason Food programs sponsored by the UN which usually are based on enriched flours are treated with anti-chelating agents such as phytase, the enzyme that neutralises phytate (also called phytic acid) ( http:///content/130/2/+html ). But the common flours used in the human North American diets are not. before the fast food revolution, North Americans consumed on average less than 10% of starches in their diets. This average is now 25%, and this is the root cause of the metabolic syndrome, diabetes and obesity epidemics, all conditions where low testosterone is a strong marker.
The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.