Blame your brain for overeating

Put on a few extra pounds over Christmas? Wonder why you feel compelled to eat half a box of chocolates half an hour after finishing your second plate of turkey, dressing, mashed potatoes and gravy? Feel a little guilty?

Well, new research offers clues to one of the most baffling aspects of the eternal battle of the bulge: why we keep eating even when we're full.

Short version: blame your brain.

When you're hungry, food looks more appealing than when you're not: hence the old adage about never s...