Pointman7 said:
Theres an old wives tale that Japanese women punish their straying husbands by feeding them a lot of tofu! Does soy lower levels of testosterone?
I'm sure it won't surprise you to find that there is no conclusive answer to this. Some claim that it does and others claim that it doesn't. The kind of processed soy proteins found in many artificial meats do contain excitotoxins, however, and there isn't any good news about these. They can potentially damage and kill brain cells but aren't found only in processed soy products. In fact, most people consume them through products containing MSG and aspartame rather than the textured vegetable proteins.
But if one wishes to avoid killing brain cells, eating meat instead of the soy substitutes is likely to do more damage to the brain rather than less. To understand why, one needs to have a grasp of the mechanism of heart attack, (myocardial infarction or "MI"), and strokes, (cerebrovascular accidents or "CVA"). In both of these common medical emergencies, the problem is loss of circulation to key body tissues. The blockage of blood flow is almost always due to plaques which build up in the arteries and this condition is known as "atherosclerosis". Eventually these plaques build to the point where the affected arteries are blocked or so near complete occlusion that even a tiny blood clot can completely close off circulation to body tissues.
If this occurs in a coronary artery, (an artery that feeds the heart muscle itself), it's known as a heart attack. If this occurs in an artery that feeds the brain, a stroke will result. And in every case, the tissues deprived of circulation die. But you needn't have a stroke to have killed brain tissue in this manner. During the Korean war it was found that 77% of American soldiers already had substantial levels of atherosclerotic plaque in their arteries. Since most of these soldiers were very young men, this was a very surprising find. Since that time meat consumption has continued to increase and atherosclerosis has been found in younger and younger people. Surgeries in 7 and 8 year olds have shown the beginning stages of atherosclerosis.
When one considers that the smallest blood vessels in the body, (capillaries), are sometimes so small that red blood cells must pass through in single file, it becomes readily apparent that it takes very little atherosclerotic build-up to completely occlude these circulatory passage ways. Once circulation is lost to brain tissues, death of those tissues occurs in a matter of 4 to 6 minutes. Brain cells which die are not replaced by the body.
In nearly every study of this problem, it has been found that the more saturated fat and cholesterol present in the diet, the more prominent is the prevalence of atherosclerosis, heart attack and stroke. Since meat is the primary source of saturated fat and cholesterol for most people, it becomes very obvious that by ingesting these foods, especially in the quantities common in many western diets today, one substantially increases the amount of brain tissue lost to atherosclerotic build-up in the smaller vessels in the brain.
As far as lowering testosterone levels goes, if the wives tale about Japanese women is true, it might surprise them to know that lowering testosterone levels helps to inhibit prostate cancers. And if the alternative is meat, the saturated fats and cholesterol which cause heart attacks and strokes don't exclude themselves to affecting the arteries of the heart and brain. They affect arteries all over the body, including those responsible for filling erectile tissues with blood. It has been well known for years that those who consume less meat show a marked reduction in erectile disfunction. So I guess it's a matter of opinion who gets punished, how much, and by what foods.