Hello! Thank you for sharing your concern with us. The most effective way to speed up your metabolism is exercise. Exercising by combining cardio 15 minutes cardio for example treadmill ( before training) , weight lifting training, and 20 minutes cardio at the end if the workout. Weightlifting helps building muscles, the more muscles you will have the higher your metabolism. Don t get confused with the mit that weightlifting makes you look like a man. It isn t true because a girl doesn t have as much testosterone as a man, which help in building muscles. Try to eat a high protein diet with cheese, egg, cottage cheese, milk chicken, fish and less carbohydrates such as bread, rice, cookies, spaghetti, desserts. Best regards.