A food that is as much trouble to eat as it is to burn. The theory is that you expend so much energy chewing and digesting these foods that you end up with a caloric deficit after eating them. The number of calories you burn chewing and digesting a food is dependent on your metabolism, so they may not be negative calories foods for everyone, but for for people trying to lose weight they make great snacks:
celery
carrots
horseradish
lemon juice
cucumber
Lettuce
cabbage
sugarfree gum
mustard
Parsley
Red Peppers
Green Peppers
Sour relish
Sauerkraut
Watercress
vinegar

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