Among common diet advice like "always eat breakfast" and "never eat after 8 p.m." (do what you want, the timing doesn't really matter), there's the old stand-by, "when you think you're hungry, drink something." The idea is that it's easy for your brain to mistake thirst signals for hunger, so you sometimes end up eating extra calories when you could have just chugged a glass of water. Is that really true? According to science, the answer is no.
Let Your Body Talk
Why Do We Feel Hungry?
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