When ghrelin starts to be produced in the stomach, a person not only feels hungry, but also starts thinking about where he can get food. Additional ghrelin injections increased the amount of food consumed by 30 percent, according to studies 2. Furthermore, a higher ghrelin level did not affect the number of meals consumed, but did affect the number of portions consumed. That is, it was much more difficult for a person to suppress food-related thoughts, which led to increased calorie intake and weight gain. Ghrelin production appears to be linked to a DNA survival strategy. For millennia, humanity has struggled to survive by locating food, not by consuming an excessive amount of readily available calories or by attempting to lose weight.
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