The Tip: Start increasing the number male invitees for your outings that involve food.

The Study: Indiana University of Pennsylvania and the University of Akron

The Theory: Researchers found women (and men!) ate less when dining with men than they did when dining with women. They attribute this to an increased awareness of established gender roles -- and be honest, as progressive as you may be, you're less likely scarf down your fourth slice or order super-sized burrito when there are guys around.

The Tip: Head to the ATM and withdraw a set amount of cash for the day and leave your credit card at home.

The Study: Cornell and Binghamton Universities

The Theory: Previous studies have found that, in general, we're more likely to overspend when paying with plastic because we can't see the physical money (cash) diminishing. Researchers at Cornell and Binghamton linked this phenomenon to our waistlines, theorizing that junk food purchases are often impulse purchases. When you have a set amount of cash withdrawn, you're less likely to blow it all on Snickers bars, soda and chips.