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.
Drinking tea may boost your metabolism and help keep you slim, according to a report in the Journal of Nutrition. In one study, people who drank five 10-ounce servings of oolong tea for three days increased their metabolism by 3 percent more than people who drank water. That boost amounted to 67 calories per day.