Photo: Lara Robby/Studio D

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Day 18: Pass the Popcorn
Here's some math you'll like: For the same number of calories (about 90), you can eat nine potato chips or three cups of air-popped (and fiber-packed) popcorn. Put a quarter cup of kernels in a paper lunch bag and fold over the top. Microwave on high for about two minutes or until the kernels stop popping. Then coat with cooking spray, sprinkle on garlic salt or cinnamon, and voilà—cravings curbed.