Can Whey Protein make you gain weight?
Yes, whey protein powder can cause weight gain, but by adding lean muscle mass. This is a healthy addition to your body in most cases and nothing to be concerned about.
While people using protein powder are more likely to lose weight through fat loss, in rare cases it can also cause weight gain where very excessive amounts are consumed. When highly excessive amounts of protein powder are consumed and unused by the body, they can be converted to fat stores. This is fairly unlikely however, as protein is not easily converted into fat stores by the body.