Lunch may be the most lackluster meal of the day. However, it’s not just the lack of options at the salad bar that might be giving people the blues but rather the excess copper consumed when they choose greens for lunch every day. Leafy greens, cashews, chickpeas, avocado and shellfish are naturally high in copper, and according to health experts, consuming too much of these food items could lead to feelings of anxiousness and depression.