I dont assume that. I am perfectly aware that weight has very little correlation to health.
But for me personally, i have an ovarian syndrome that both causes weight, and is worsened by it. If i dont lose the weight that is causing my PCOS to become worse, then i may not be able to have children. PCOS also increases the risk of developing type 2 diabetes.
I am losing weight because i have a disorder, not because i want to be healthier.
But go ahead, id rather lose a follower than have someone who doesnt respect my choice to live a longer life and be able to have kids