"Why do some foods make you fat while others make you thin?" I'm sure you have asked yourself that question before. Eating foods that speed up metabolism is a concern that is on the minds of many people. This problem is due to the fact that the foods that make you fat get converted to fat quickly and with little energy. Foods that speed up metabolism are usually foods that take more time and effort to digest and therefore make your thinner.
Without getting too technical, we can name the foods that speed up metabolism "negative calorie foods." What they do is make your digestive system work very hard during digestion because they contain mostly fibrous materials, something the body cannot easily break down or store as fat.
The basics: Your body burns more energy (calories) when converting that food into fuel than the total amount of calories in your meal. Essentially, you use enough energy to burn off the food you ate AND some extra body fat while you speed up your metabolism. Take a look at this example.
A salad contains about 100 calories but it takes your body 150 calories to complete the digestion process. Your body has converted all 100 calories from the salad AND an additional 50 calories from extra fat stored in your body, which results in a net calorie loss.
How it really works for most of us is quite the opposite. We consume a rich fudge brownie containing 245 calories but our body burns only 80 calories to digest it. So that means we have GAINED 165 calories which will be stored away as body fat for "later use". The big problem comes when you are not exercising on a regular basis to burn up those stored calories. That's when they sit there around your waste or thighs and collect until you can't fit into your clothes anymore.
Get more familiar with negative calorie foods by searching the internet for a list that you can get meals ideas from. Incorporate these foods that boost your metabolism into your daily eating habits and soon enough you can start to see and feel the healthy effects they have on your body.