Answer:
Marcy should decline
Explanation:
Since Marcy's weight and her friend's weight is not specified, the safest bet is that she should refuse. Marcy could lose a lot more weight than her friend did because they don't weight the same. In addition, everyone loses weight in different ways, so if she tries the supplement, she could lose healthy weight her body needs to live, and you know, kick the bucket. All because her friend took the supplement.
