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In fact, it should be pointed out that only 60% of those classified with Erectile Dysfunction Syndrome are actually overweight. And the explanation for that may be the fact that the 40% may be insulin resitant even though they are not overweight. This can result from, for example, being thin with a lot of visceral fat or being thin and very metabolically active.  Again, watch the triglyceride to HDL ratio for possible clues.
NOTE: The Triglyceride to HDL-C ratio is certainly not a perfect measure of insulin resistance and has been found to be only a little better than the Total Cholesterol to HDL ratio for predicting cardiovascular outcomes.  Again, keep in mind that total cholesterol less than 150, and not having resulted from disease or medical condition of course, is probably the best insurance against heart disease. I cover this in the following link on a Low Fat Diet, which is the easiest way to get your cholesterol at or near the 150 mark. Interesting enought, a Low Fat Diet can actually raise Triglycerides and lower HDL and yet it still provides excellent heart protection assuming one's cholesterol is near 150.
Researchers have also discovered that where fat is located is all-important when it comes to insulin resistance for example. One study pointed out that there are no sumo wrestlers or NFL players who are insulin resistant even though many are significantly overweight. However, when they retire they almost always become insulin resistant because "their fat moves from the subcutaneous compartment to the visceral compartment".  Visceral fat is considered to be an actual organ and effects many part of our metabolism. A good measure is basically the ratio of a measurement around your belly button to that of your waist.
What is visceral fat? You may have read about "apples" versus "pears", referring to the general shape of a person's body. Basically, this is referring to whether or not any excess weight on your body tends to go to your belly button area or to your butt. If it goes to your belly button area, you are more quickly building up "organ fat", which is linked to type 2 diabetes, Erectile Dysfunction Syndrome and cardiovascular disease. So even if you are a Skinny Bastard, like myself, you can have a relatively high level of visceral fat and its ensuing negative health consequences.
Another factor that may lead to insulin resistance is a High Fat Diet. Researchers found that, at least in animals, a High Fat Diet led to mitochondrial function genes being down-regulated which mimics what is seen in insulin resistance.  This has been verified in multiple animal studies and scientists have just discovered in the last few years the pathway by which this occurs.  Originally, it was thought that free fatty acids might compete with glucose-like substances for use in the cell, but research is pointing in a different direction now. The important thing to remember is this: the more fat, the less the mitochondrial function, the more likely you are to be insulin resitant and receive all of the nasty symptoms that come with it.
Keeping and raising mitochondrial function is also related to its sister disorder: type II diabetes. The lead of one recent study  on the subject wrote "There is a strong relationship between lipid [fat] content in the muscle and insulin resistance in skeletal muscle". He then stated something ultra-critical: "Insulin resistance is the best predictor for whether someone will eventually develop type 2 diabetes". In other words, type II diabetes is really not the sister of Erectile Dysfunction Syndrome, it is the offspring!pring!
Another important aspect of Metabolic Syndrome to remember is that it generally leads to weight gain, due to the insulin resistance as Japanese scientists have just discovered that high insulin levels keep your body from breaking down fat. An insulin resitant individual will have high insulin levels and high glucose concentrations, a toxic combination that causes damage in different ways. The high insulin levels are deadly because the block the breakdown of fats by adrenaline and lipase. 
So is there hope in the battle against Erectile Dysfunction Syndrome or is it simply an inevitable part of aging? As always, science has uncovered many practical solutions, which I have compiled in my link How to Defeat Metabolic Syndrome.
NOTE ON APNEA: Of course, the easy weight gain that comes from insulin resistance is deadly in many ways. I document the many Dangers of Being Overweight. But one I would like to highlight is that weight gain is associated with apnea.  Apnea is a sleep disorder where the airway is temporarily restricted leading to extremely restless and interrupted sleep and it whacks testosterone, makes Erectile Dysfunction Syndrome even worse and can lead to a host of nasty distorders.
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