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Hey, thanks for commenting.
Several studies have shown that we reduce our servings of food when we drink water 30 min before eating. Drinking water before each meal provides a sense of fullness, so not too much food is needed to reach the point of satiety. It's also important to note that drinking too much water before eating will dilute your digestive juices and alter your good digestion. One glass is reasonable.
I'm a registered Dietitian in France and Cyprus. I'll try to make a post on veg proteins soon then :-)