I think what the parent meant by "no dietary changes" is that they didn't have to exercise any special discipline over their diet. If I'm exercising regularly

I think what the parent meant by "no dietary changes" is that they didn't have to exercise any special discipline over their diet. If I'm exercising regularly with sufficient intensity my appetite will go up, yes, but I still lose weight. For me, when training, keeping weight on is the dietary challenge. It's hard to eat enough!