1. Eat Spicy Foods: Hot red pepper, which contains the appetite-suppressing chemical capsaicin, and other spicy foods speed up your metabolism through the process of thermogenesis or turning energy, such as calories, into heat in your body. Think of your body as a machine. The more it works, digesting food, exercising etc., the more it burns.
Source and spot to read more: http://www.livestrong.com/article/493605-does-spicy-food-increase-the-metabolism/#ixzz1SrsFR5s9
2. Build Muscle
Every pound of muscle uses about 6 calories a day just to sustain itself, while each pound of fat burns only 2 calories daily.
3. Workout Harder
High-intensity exercise delivers a bigger, longer increase in resting metabolic rate than low- or moderate-intensity workouts.
4. Drink More Water
The body needs water to process calories. If you are even mildly dehydrated, your metabolism may slow down.
5. Ice, Ice Baby
Research suggests five or six glasses of water on the rocks can use up an extra 10 calories a day.
6. Keep Snacking
Having a small meal or snack every 3 to 4 hours keeps your metabolism cranking, so you burn more calories over the course of a day. Grazers tend to eat less during meal time.
7. Pursue Protein
The body burns many more calories digesting protein as it uses for fat or carbohydrates. Protein may require almost 25% more energy to digest compared to fat. Although you want to eat a balanced diet, replacing some carbs with lean, protein-rich foods can jump-start the metabolism at mealtime. Healthy sources of protein include lean beef, turkey, fish, white meat chicken, tofu, nuts, beans, eggs, and low-fat dairy products.
8. Black Coffee
Taken in moderation, one of coffee’s benefits may be a short-term increase in your metabolic rate.
9. Green Tea
Drinking green tea or oolong tea offers the combined benefits of caffeine and catechins, substances shown to rev up the metabolism for a couple hours. Research suggests that drinking two to four cups of either tea may push the body to burn 17% more calories than normal for a short period of time.
10. Keep Moving, especially in the a.m.
Source: WebMD, 2011: http://www.webmd.com/diet/slideshow-boost-your-metabolism