I would hazard a guess that if you both stopped with your restaurant visit, you probably would have still gained some weight, but not five pounds. The key is moderation. Sure, you can go have that hamburger, but you need to stop there. The next time you have a wicked craving for something, (and we all know there will be a next time) go ahead and have it, but don't do it every day and pick just one thing. Then you can do a caloric exchange of sorts, like add a couple of miles to your walk, or do 25 more jumping jacks, or eat fewer potatoes.
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