Randy is trying to lose weight, but he wants to lose it fast—in time for his vacation to the beach in a few weeks. He saw a commercial for a new powder that can be added to shakes or coffee to help with weight loss. It comes with a 100% money-back guarantee that he will lose 20 pounds a week! Randy thinks it would be much easier and faster than changing everything he eats and trying to get to the gym. What might be some of the side effects? Check all that apply.