If you want to speed up your metabolism you need to exercise and workout with weights, but exercising will help tremendously. As you progress, you can include a little weight training.
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i dont know if there is any true food to help.. exercise if the key to increase your metabolism..
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chillies apparently help speed up metabolism. i took weight loss support tablets, which were also to aid in metabolism adjustment, and they worked well. look for them at your local pharmacy
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You should actually try to eat more vegetables and fruits. Stay away from junk, unless its diet, or has less calories.
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Research affirm that a diet of chillis and capsicum tend to switch on the metabolism. Most personal trainers I know also recommend drinking caffeine (without the sugar, creamer and milk) before a work out.
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Always have breakfast, it kick starts your metabolism.

Drink plenty of water
Green Tea
Apples and pears
Oatmeal
Broccoli
Low-Fat Yogurt
Grapefruit
Hot Peppers
Lean Beef, Pork, Chicken, and Turkey
Salmon, Tuna, and Sardines
Soup

foods that boost your metabolism are proteins, so eat a lean steak, with plenty of vegetables, and go for a walk. Within hours, you’ll feel vital energetic and within days, you’ll start to lose weight again.

http://www.fitfaq.com/2004/07/15-foods-that-boost-metabolism.html

http://wow.gm/north-america/united-states/virginia/article/2008/2/10/foods-that-boost-metabolism-what-should-you-eat-to-lose-weight
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http://ezinearticles.com/?Foods-That-Boost-Metabolism–Raise-Your-Metabolism-And-Lose-Weight-Fast&id=481824
http://wow.gm/north-america/united-states/virginia/article/2008/2/10/foods-that-boost-metabolism-what-should-you-eat-to-lose-weight