There are
7 tips to speed up your metabolism. Calories do count, but it's also about how efficiently your body burns those calories. Your metabolism plays a big part in regulating your weight. Metabolism is the way your body uses up calories from the food you eat and turns them into energy.
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really neither one is good
really neither one is good for you, but if you really have to drink one then definitely go for the diet coke b/c you really want to cut refined/processed sugar out of your diet when trying to lose weight and be healthy.