Prior to this study, competition and aggression were believed to be the natural boosters of testosterone levels, but now researchers may begin to examine the sex hormone’s roll in the male body. "By focusing so much on the role of testosterone in aggression and competition, we have missed out on the importance of testosterone in a variety of other tasks," said Trumble, reports ABC Science . For Tsimane men in Bolivia, environment plays a bigger role in hormone behavior because they have a lifestyle that requires them to cultivate their own food. The spikes in testosterone levels enhance muscle performance, which improves their ability to cut trees and get food for their families.
That’s something the ancient Romans didn’t know when they tossed walnuts at newlyweds for good breeding luck. Long linked to fertility—the shell, of course, resembles a man’s cojones; the inside meat is vulvalike in form—nuts make a perfectly sexy snack. Packed with muscle-building protein and filling fiber , they are a heart-healthy, albeit calorie-dense, treat.
Pistachios contain plant cholesterol that can produce a 10-point drop in your triglycerides and a 16-point decline in your LDL (bad) cholesterol, reports the Journal of the American College of Nutrition .