Depression has been linked to low levels of folic acid, and one vegetable that boosts this mood-enhancing nutrient is asparagus. A single cup provides two-thirds of your daily value, and it’s easy to fit asparagus into almost any meal. Some ideas: Sauté some asparagus tips for a tasty omelet. Go with steamed or grilled spears as a side vegetable for meat, fish or poultry. Snack on some steamed spears by dipping in some dressing.