Let me put it this way - I never realised just how sick and incapacitated I was when I was obese... until I lost weight. And mind you, my obesity was entirely self-inflicted.
I thought I felt fine and was healthy at my heaviest - my bloodwork was good, after all, and I could walk, so clearly I must've been Healthy, right? Well, nope. All the little pains and niggles I had, the aching knees, the getting out of breath when taking the stairs, the lack of ability to run any distance, the back pain, the hip pain, the permanent tiredness... I never realised how badly all of the above affected my daily life until it all disappeared when I lost weight.
I'm at an almost-healthy weight now and the difference is breathtaking. I can MOVE. Easily. Without pain that I was so used to I considered it normal. I have ENERGY. I can run for a while without feeling like I'm going to drop dead.
I am only in my mid-twenties, so yeah, I was reasonably 'healthy' when I was obese, but now I can see that my shit choices would have caught up with me sooner or later and that I WAS eating myself to disability. Every single day I carried an extra 30kg on my body - that's a heavy load. Losing that crippling weight made me healthier. I'm no longer at risk of... well, a rather disturbing menu of disease.
It wasn't easy, but it was worth it - I always had a messed up relationship with food, but I did it VERY slowly (took me 2 years to lose 30kg) and I really understand it now - obesity kills, cripples, and incapacitates, and is usually preventable AND curable.
So please, stop glorifying obesity. Stop normalising it. You're not helping obese people by saying they can be healthy at any size. You CANNOT be healthy and mordibly obese - there's a reason why it's called MORBID obesity. Yes, skinny people get sick too, but they're sick despite their size, not because of it. And whilst obese people might... function... at their weight for now, it'll catch up with them sooner or later. And yes, many of their health problems will be caused directly by the excess fat they're carrying.
I look at that cover and I see a very, very sick person. I don't want to be like her. She's neither inspirational nor amazing nor beautiful. She's a picture of sickness, a warning really. I'd much rather look at models who are a healthy size 12.