One huge common misconception is that metabolism and energy are the same. Metabolism in layman's terms is really just the process of how our body breaks down matter or in a dieter's case food, and also the process it builds cells like muscle tissue.
I'm sure you have heard of negative calorie foods, things like broccoli and grapefruit. I hate to be the bearer of bad news but they are not "negative calories" and the only thing that could be truly called a negative calorie food is water, which is another advantage to getting your 8-12 glasses a day. All foods have a Thermic Effect, or TEF for short. The thermic effect is related to the amount of energy needed to metabolize food. Protein is the ultimate burner and dietary fat will have very little effect on your metabolism. The TEF of protein is around 30-33%, so to metabolize a calorie of protein it takes 1/3 calorie of energy. Or for every 100 calories from protein it takes 33 calories to process it. Dietary fat is only 2-3%, and carbohydrates only about 7%, making Protein the undisputed Metabolism Booster of the World!
So protein is one way to increase your metabolism, another huge way to increase metabolism is lifting weights. Lifting weights helps metabolism 2 very important ways.
1. When we lift we are tearing muscle tissue that will need to be rebuilt later, causing an increase in metabolism.
2. After the muscle are rebuilt and now stronger it takes more calories daily for them to function and maintain thus increasing our resting metabolism.
Metabolism is extremely important to weight loss, when we are dieting our stored body-fat really can be the main source of energy to run our metabolism. When our metabolism slows down our weight-loss will slow down too.