Eat moderately Vitality and strength depend not on how much we eat, but on how much we are able to digest and absorb into our system. The stomach needs working space, so instead of filling it completely, fill it just halfway, by eating only half as much as you think you can, and leave a fourth of the space for liquids and the other fourth for air. You'll help your digestion and get more pleasure from eating. Moderate eating will also give satisfaction to your mind and harmony to your body. Overeating makes the mind agitated or dull and the body heavy and tired.
Digestion certainly involves combustion.
Therefore, because we often drink with our meals, the effect of liquid on fire becomes an important consideration in the art of eating. Drinking before the meal tempers the appetite and, consequently, the urge to overeat. Drinking moderately while eating helps the stomach do its job, but drinking afterwards dilutes the gastric juices nad reduces the fire of digestion. Wait at least an hour after eating before drinking again, and, if need be, you can drink every hour after that until the next meal. The scriptures tell us that for every bit of food wasted in times of plenty, an equal amount will be lacking in times of need.