To help speed up ur metabolism? You should, cut carbs (pasta, bread, potato, rice etc), eat protein (tuna, steak, chicken, salmon, fish) eat more veg and fruit. Exercise about an hour a day five days a week. Drink a pint of water in the morning, water is needed to carry the fats and toxic products that are broken down during fat depletion but it also speeds up metabolism. Drink about 8 glasses of water a day (I drink flavoured water though as its nicer and it also fills you up more which stops you excessively eating). Green tea and caffeine are the main ingredients in the 'fat burning' tablets, only in larger quantities, so when you exercise? have a coffee before you gym it. Put two spoonful's in. Green tea is good to drink and it is suggested it speeds up metabolism. Fruit and veg require the body to break it down for longer which increases the metabolism so eat 5 bits of fruit a day. ALSOO...I know this as I worked at a gym, the MAIN thing to increase metabolism...when in the gym? Cardio loses the fat HOWEVER you need to add in some weights (even light weights) this is a known fact that adding in weights builds a bit of muscle and this muscle will help speed up your metabolism by 45%.
To summarise: Cut carbs, eat high protein, drink more water & fruit & take up some exercise, drink green tea, do cardio to burn fat, some weights to build a bit muscle to speed up metabolism. Its fun! Try it