It Can Cause you Acidity
Drinking water is believed to cause acidity because your stomach will absorb as much water as it can while you are eating and drinking. This can dilute gastric juices and slow down the process of digestion. With undigested food sitting in your system, the result is acid reflux and heartburn.
But there are no studies yet to prove the effect. So the role of drinking water between meals in increasing the risk of acidity cannot be taken into consideration.
It May Affect your Digestion
People believe that drinking water during your meal basically has an adverse effect on digestion, starting from reducing the amount of saliva in your mouth. Reduced saliva sends weaker signals to your stomach which ends up impacting the release of gastric juices and enzymes. So absorbing and breaking down of food is hindered from the moment you sip water while eating your meal.
But contrary to this belief, studies show that there is no influence on drinking water on actual food intake during and after a meal.
It May Slow Down the Absorption Of Nutrients
It is also believed that by diluting gastric juices vital to fighting infectious substances, you are also preventing food from breaking down properly. When digestive enzymes in your stomach are diluted with water, your food will sit in your stomach for longer. It may pass through the small intestine at a slower pace with fewer nutrients being absorbed.
However, this is just an assumption and not proven in any research study. So the role of water in lowering nutrient absorption is not fully understood.
It May Cause Weight Gain in your body
Another popular belief of drinking water is its effect on gastric juices and its ability to increase the amount of insulin in your body leading to weight gain. This is claimed to be because when your body is not able to digest food well it gets converted into fat and stored in the body. Also, diluted gastric juices cause food to be absorbed slowly which in turn is converted into fat, causing you to put on weight.
There are numerous online sites that claim drinking water during meals is not a good idea as it can cause weight gain but no research study supports the claim.
Now based on above points, we can say that drinking water during eating is not a good idea.