The research team also speculated that spicy foods could have a reinforcing effect, in which they boost testosterone, and thus, more testosterone increases a person’s liking of spicy food — they said, however, this effect had only been seen so far in rats. It’s likely that’s not the case, however. The researchers noted that there could have been two other reasons for the findings: the men with higher testosterone could have been attracted to the hot sauce, with its aggressive red color (studies have found links between these) or maybe they just grew up eating spicy food. But all these show is that spicy food doesn’t cause testosterone levels to jump, even if there’s a correlation.
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."