Original sentence: Placebo-controlled studies have consistently found ephedrine in combination with caffeine to be effective in promoting fat loss without increasing serious adverse events.The aspirin component has been alleged to increase the thermogenic response to the ephedrine component but study results on this have been inconclusive
Edited sentence: Another marketing claim made for the ECA stack was that it would increase athletic performance, but repeated studies in the medical literature have not demonstrated a positive effect on athletic performance.One study found a positive effect in obese women but not women of normal weight; a later study found no effect.Placebo-controlled studies have consistently found ephedrine in combination with caffeine to be effective in promoting moderate fat loss without increasing serious adverse events compared to the placebo.The aspirin component of ECA was alleged to increase the thermogenic response to the ephedrine component but study results on this have been inconclusive