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Some foods that make you fatter and others make you skinnier. Why is this? The foods that cause you to gain weight take little energy to burn. They are processed right away and then stored at fat. Foods that make you skinnier are usually foods that speed up metabolism by using up more energy during the digestion.

The foods that speed up metabolism are classified as “negative calorie foods”. These foods do not have some mystical properties that erase the number of calories in your body (don’t I wish?) so the name can be a bit misleading.

What actually happens is that these foods cause your body work harder during the digestion process. Foods like this already contain a decreased amount of calories to begin. They are also full of fibrous materials that the system can’t easily break down; therefore it uses more energy during the process.