We should not bath after taking a meal. Usually the blood circulation increases while we sit for eating. The body needs energy for breaking the food particles for digestion. When you are taking bath after a meal, your body temperature lowers down. Since the body starts cooling down, it has to work extra hard to maintain the standard temperature to aid digestion. As a result, the process of digestion is slowed down as the blood helping in digestion, starts flowing towards other body parts to maintain normal temperature. It can also lead to discomfort, uneasiness and acidity and delays digestion. One should wait for at least 2-3 hours after eating to take a shower. Ideally, one should go for a bath before eating as it leaves you feeling refreshed, rejuvenated and ready to eat. There is a scientific reason behind our ancestors words.