Always eat breakfast! Skipping breakfast sends the message to your body that you're starving because you haven't had food in 18+ hours. As a protective mechanism, your metabolism slows down. Food, especially complex carbohydrates, fuels your metabolism.
Eat earlier in the day! Research has demonstrated that you can lose weight simply by eating a substantial breakfast and lunch, and a light dinner. Dinner should be eaten as early as possible, preferably at least four hours before bedtime.
Never eat less than 1200 calories per day! Less than 1200 is usually not enough to support your basal metabolism and thus will slow your metabolism.
Snack frequently! Complex carbohydrates (fruits, vegetables, and grains) fuel your metabolism. Also, snacking prevents you from becoming too hungry. The hungrier you are, the less control you have over what and how much you eat.
Eat more carbohydrates (food from plants), and less fat (food from many animals and other food with added fat)! Carbohydrates boost your metabolism and have fewer calories per weight than fat.
Do some type of aerobic exercise (walking, jogging, swimming, stationary cycling, aerobic dancing, etc.) on a daily basis (preferably in the morning)! Forget this twice-a-week stuff. Our bodies were designed to be active on a daily basis!
In addition to your regular aerobic exercise, take a brisk 10 to 15 minute walk at lunch or in the evening. This serves to boost your metabolism even more!
Tone your muscles with weight training three days per week. Toned muscles send your metabolism through the roof. Do it!
Look for situations to be active. Park as far from the store as you can rather than looking for the closest parking spot. Use the stairs rather than the elevator, a broom rather than a blower, etc. Look for the "hard" way to do things!
Avoid alcohol! YES! Alcohol depresses your metabolism and stimulates your appetite.