This is very true, and it is almost like the fight-or-flight response, where your body gets the adrenaline rushing and that is when you hear about people being able to lift cars and jump from 6-story buildings. It is a natural instinct of survival that we all have inside of us. Hope this helps.
Marcy should not do it. Supplements don't make you lose weight, they make you lose fat, something your body needs. Excersising would be way healthier for her than supplements.