Basil: Lower stress levels and the risk of heart disease by using herbs like basil, which has a calming effect. It’s a good source of vitamin A, which protects your body at the cellular level, and magnesium, which prompts muscles and blood vessels to relax for better blood flow. Kai lan, bak choy and brussels sprouts: These leafy greens are rich in magnesium and B vitamins, which aid muscle contraction and relaxation (after all, the heart is one big muscle!). Have them stir-fried with low-sodium soy sauce or try roasting the bak choy and brussels sprouts. Avocadoes: They’re rich in monounsaturated fats and omega-3 fatty acids that keep the arteries clean and lower blood cholesterol levels.