If you deny the reality of your body or your life, you'll never be able to dress any of it well - even the parts you love. You have to see it all to work with any of it.
Whether you're as healthy as you should be or not, that doesn't disallow you to look your best. Style is only possible from a place of self-acceptance.
I think that the way to have style is to accept where your body is right now, heavier or skinnier, whether you're going to change in the future and dress it as it is. The fact is you can always find clothes. It may be harder for plus sized people, I completely understand that. But I don't believe that it's impossible to dress with style.