So I have been using coffee as a preworkout caffeine boost but these past weeks I started to use sugarfree energy drinks and I'm wondering if they have any effect on my muscle to fat gain ratio. I know that aspartame (the sweetening in it) makes you less able to withstand sweets, as your brain still thinks it ate sugar but didnt get enough but as I have the discipline rarely seen in contemporary men, that is not an issue.