When my dad was a 12-year-old kid in Red Bluff, California, circa 1928, part of the extended family was a man he knew as Uncle Jack Cotney. That they knew of, or he'd admit to, Uncle Jack had survived some 25 stand-up gunfights in his life.
Green tea is a fat burner that does speed up the metabolism, as far as energy drinks however they really speed up the heart not your metabolism. If you're looking for something that will speed up your metabolism there are better choices for that. Good Luck, Casey.
Metabolism is the rate at which the body burns up the calories. Drinking Three or four cups of green tea is seen to improve the metabolic rate by 4% over Twenty four hours. Green tea contains chemicals called catechin and polyphenols which have antioxidant properties and also act as metabolism boosters.