FIT5 How-tos :: The Optimum Diet :: Digestion and metabolism :: Why do you feel tired after a big meal?

Of the body's inner functions, digestion use up the most energy. This is the first priority task of the body, and to do so, it spares every other function. You may have felt after a big meal that your body and brain were blocked? In this case you should take a 20-minute walk instead of sleeping.