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The concept of a cheat day is a weight-loss staple, but it's also the Achilles' heel of many eating plans. A day of eating whatever you want can add up to thousands (yes, thousands) of extra calories. It can also make it harder to get back on track the next day, when your brain has a chocolate cake hangover. Instead of splurging for an entire day, Lisa Young, Ph.D., R.D., the author of The Portion Teller Plan, recommends limiting yourself to just one cheat meal each week. "Plan it, enjoy it, and as long as it happens just once a week you won't break the calorie bank."