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.
Water revs up metabolism and helps you feel full. Replace calorie-filled beverages with water, and drink a glass before meals to help you feel fuller. Drinking more water helps amp up metabolism - especially if your glass is icy cold. Your body must work to warm the water up, burning a few extra calories in the process.