Second-helping? Wait it out. U of Florida research shows that your brain may not signal a feeling of fullness until 10 minutes after you stop eating. Also found: the signal is even slower in obese people. One researcher suggests eating slowly may provide more time for the feeling of fullness to occur, but if you still feel like going back to the pot, try waiting out the desire for second helpings. Drink a glass of water, wait 20 minutes and then tune in to how you are really feeling. — source: BBC and University of Florida