IMO very unproffessional opinion if your true ideal weight is 178 and your 115 overweight your heart probably wouldn't benefit from getting amped up for exercise. Heres the trick don't eat a huge meal after you do a crazy workout but do eat something.
just saw the edit 15 lbs nvm go for it.
obviously just at 15... the gain 5 lbs weight thing is complete absurd so disregard that, just looked it up jack3d got a lot cheaper. They say half an hour pre workout, not true takes an hour. Do not take this if your about to sit for 4 hours you'll feel like a massive sugar rush. But I've found if you use it before workout you don't fall asleep in class after you workout (great plus to a college student)The claim you don't hard crash is true. Which is good cause if whatever you take makes you crash, whenn you crash, you stop burning calories.