Your body needs dietary fat to produce testosterone. Research suggests that when total fat, saturated fat and monounsaturated fat intakes increase, so does testosterone. Studies found that men who ate diets rich in monounsaturated fat – the kind found in peanuts – had the highest levels of testosterone. Therefore, eat a diet of 30% fat, but don’t overload on polyunsaturated fats, instead concentrate on choosing monounsaturated fats like those found in nuts, olives, olive oil and avocadoes, and saturated fats from red meat and egg yolks.
But I'm not more aggressive—a behavior change often tied to testosterone. That's not surprising to Robert Sapolsky, ., a neuroendocrinologist at Stanford University and a leading researcher on stress and behavior. "It's really not the case that testosterone 'causes' aggressive behavior," he says. "Instead, it makes the brain more sensitive to social cues that trigger aggression. And in support of that, a guy's testosterone level isn't a very good predictor of how likely he is to be aggressive."