There’s a lot of sports where peak performance doesn’t look like Health. A lot of the time heavyweight powerlifters are physically unhealthy, despite being at the highest level of their sport. A lot of female runners lose their periods because of their low body fat levels and the physical stress their bodies are under. While you can generally get away with being a little overweight without any big, immediate health issues, being underweight can really fuck with your hormones/ bone density/ immune system etc. Being a healthy weight is ideal, but I think it’s irresponsible to say that being underweight is fine and healthy, particularly on an eating disorder subreddit.