Start replacing all your regular snacks for healthier options. Instead of eating Charlotte Rehab chips and cookies replace them with fruit or yogurt. You will not only notice the difference after a few weeks when you do this but it will also help give you more energy when you exercise, remember you are what you eat. Vitamin B12 is an important part of a healthy diet. It plays a role in releasing energy from the fat, carbohydrates and protein that you eat. Vitamin B12 also helps in the formation of blood cells, nervous system maintenance and bone metabolism. You can find this vitamin in dairy products, eggs, fish, meat and poultry.