Good diet. legumes, grain products, and other complex carbohydrates, with plenty of fruits and vegetables and modest levels of protein; this diet provides plenty of vitamins and minerals. Particularly important are citrus fruits for vitamin C to strengthen blood vessel walls, and low-fat dairy products. There is no aphrodisiac or one food that results in a better sex drive so eat a well balanced diet.
Healthy nutrition. Best nutrition to help sex drive is the kind that keeps your body and mind healthy overall. First, no smoking/recreational drugs; no/low alcohol. Whole foods with many multi-colored vegetables and fruits, lean proteins, and healthy fats (olive oil, avocado, omega-3's). Any carbs should be whole grain, complex ones rather than sugary confections. A loving partner to share it with, makes it fun.