The study assessed 75 obese men who were visiting a weight loss clinic. They measured hormones and tracked erectile function and libido. Fifty four of the 75 had signs and symptoms of androgen deficiency, and 27 actually had low testosterone. Low T was related to the highest BMI and waist circumferences. What the article doesn't mention is that adipose tissue actually makes estrogen. Seventeen of the men opted for gastric bypass surgery. The finding: radical weight loss normalizes testosterone levels in obese men. So if you're overweight and your sex life is not the greatest, here's one straightforward way to fix it.