An ounce of walnuts has four grams of protein (which fills you up and helps keep blood-sugar levels steady) and two grams of fiber (also helps fill you up).Walnuts also contain cell-protecting antioxidants and are low in carbohydrates, which means they won’t cause a spike in blood sugar and insulin. “Insulin spikes are a reason people’s moods crap out, particularly in late afternoon.
Coffee is practically a magic bean when it comes to mood lifting: The caffeine in coffee can boost mental focus and alertness and athletic performance. Coffee consumption may also protect against Type 2 diabetes and decrease the risk of depression. But the less you consume, the better it works.
Dark chocolate is one of the biggest mood boosters. Dark chocolate not only provides immediate eating pleasure, but it has a high percentage of cacao, which has more antioxidant power than many other foods.