He wants acceptance and love, everyone wants that. He also noticed he got more attention when he is skinny with abs. There is such a huge pressure in the Kpop industries for idols to have an image of perfection, and often that means no fat. Baekhyun dealt with years of trying to keep his weight under control, he would go from looking slightly chubby to starving, back and forth. He finally stopped that and changed his diet to mostly meat and now he avoids carbs so he doesn't have to limit what he eats, and he looks healthier than ever. He also became more muscular so he appears thin without looking sickly. I feel so bad for Jimin tho, like I will love him no matter what he looks like. But I can't say that for everyone, some people only want a Jimin with abs. It makes me so mad.