Have you ever stood in line behind someone with obesity at the supermarket and judged them on the basis of the items they were pulling out of their cart? Or behind someone with obesity at a fast food place and judged them on the basis of their order?
Now ask yourself if you have, or would have, similarly judged a thin person pulling out those same items or making that same order.
And it's worth noting, there's no good answer here.
If you answered, no, you wouldn't have judged a thin person similarly, well that reflects weight bias.
And if you answered, yes, you'd be judging them the same way, well that reflects you judging people on the basis of things that are none of your business.
Everyone's life is complicated, and moreover, food plays roles far beyond fuel and serves as comfort, as celebration, is one of life's most seminal pleasures, and it's not for anyone to judge anyone else on the basis of their choices therein.