Would you still talk to him about his diet or would you assume his aggressive behavior has other causes?

Trait Theory Scenario
Assume that diet is associated with aggressive behavior. What if you are dating someone who eats a lot of food that contains polyunsaturated fatty acids, zinc, magnesium, iron, folate, and B, C, & E vitamins, and he shows aggressive behavior towards you. Would you talk to him about how his diet may be causing his aggressive behavior? What if you both ate that same diet, and he behaves aggressively, but you don’t? Would you still talk to him about his diet or would you assume his aggressive behavior has other causes?