Have you ever seen that show "Intervention" on A&E (it airs Sunday nights @ 10)? One episode highlighted a young lady with bulimia and as a part of her ritual to control her caloric intake, she chewed and spit, just as you're describing. A quick Google search of the terms "chew spit food" uncovers info stating that this behavior is often present in conjunction with anorexia and/or bulimia. Some health practitioners view chewing and spitting as a behavior concurrent with those aforementioned eating disorders, while others consider it a disorder on its own.
Some information suggests that doing this with foods like sweets (candy bar, for example) can screw up your insulin levels because some of the candy is absorbed by the tongue. Kinda defeats the purpose, no?
If you're eating generally healthfully and exercising a moderate amount, yada yada yada, and otherwise living a healthy lifestyle, it seems reasonable that you should be able to allot yourself some calories for treats, so that you wouldn't have to concern yourself with spitting out the "extra" food.
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