While, to date, no studies have been conducted on humans, animal studies have consistently shown that NAD may be of great benefit in helping to slow the aging process. So, just how can we get in on this? Certain foods, such as cow’s milk, yeast, and even beer, contain NAD enhancing qualities. But consuming enough quantities may prove problematic for your diet. You may consider periodic fasting, which will help. A supplement called oxaloacetate will help mimic fasting if you just can’t put down the chips. You could also try maintaining a strict keto diet, one high in fat and low in carbs. Your body will stay in a state of ketosis, and levels of NAD will increase.