Trans fats: According to a recent study published in PLoS One, eating trans fats may have a significant link to greater aggression and irritability. Research suggests that trans fats may prevent the formation of omega-3 fatty acids, which have been shown to improve mood.
Refined sugar: It may give you a quick jolt of energy, but it won't last. And when your blood sugar levels inevitably crash, you'll be left feeling irritated and exhausted.
Dehydration: According to a small study in The Journal of Nutrition, being just over 1 percent below optimal hydration levels can result in headaches, loss of focus, and fatigue.
Next: 3 ways to beat emotional eating