Rest is another important factor in having a healthy, well-functioning body. An under-rested body will create disease of the body, in the future. During sleep, the liver detoxifies the blood and the ATP (adenosine tri-phosphate) molecules "the energy source" of the body can re-charge themselves naturally from all of the nutritious food we have eaten throughout the day. It is important not to eat late at night (before bed) because instead of the liver detoxifying the blood during hours of sleep, the blood is concentrated in the stomach and is helping to digest food molecules all night long. This produces more lactic acid in the body and hence, we wake up feeling groggy and maybe even achy and sore. It can also cause puffiness under the eyes.