To the people saying thin people also have food noise, I find this really confusing, admittedly as a fat autistic person. I do have rigid thinking, and I know this probably contributes to my confusion.
Everything in my life is pathologised by the professionals involved in my care. One of our senses is interoception, the ability to feel things going on inside our bodies, the main ones being pain, temperature and hunger. When you're autistic you can feel these on varying levels. I have really poor interoception. I've had to have a health passport built because I can't tell when I'm actually dying and it leads to a lot of diagnostic overshadowing. I had sepsis, peri and myocarditis and the only thing I realised about myself was that my skin was red. I didn't realise my shoulder was dislocated, just that my arm wouldn't move. I'm always either too hot or too cold. I complain whatever the weather. With hunger, I never just feel hungry. I feel like I'm starving. I feel so sick and so nauseous, and I get the shakes. When I'm eating, I never eat just the right amount because even while I'm eating I feel like I'm starving until suddenly I feel fit to burst. Then not long after the feeling of starvation comes back. On WLI, that horrible feeling of starving goes.
I know in my case it's probably extreme, not everybody facing obesity is autistic, but obesity itself is a disease. It can affect how you process your hunger hormones and your fullness hormones, and the sensation this gives you in your body and the timings of these sensations.
My nan, who has been thin all her life doesn't know what food noise is. She eats when she's hungry and she stops when she's full. My own child eats when he is hungry and he stops when he is full.
I also eat when I'm hungry and I stop when I'm full but I feel hungrier more often than they do, and I don't get the feeling of fullness till much later, even if I give myself small portions, even if I give myself 20 minutes before continuing, even if I chug loads of water to make my stomach heavy.
Obesity is a disease you pretty much have all of your life even if you've been obese and you have managed to lose the weight, and it needs to be managed. For some people that can be managed with the right foods and for others it can't simply just be managed by moderating foods and it needs medical or surgical intervention.
I'm not saying things people never feel hunger or don't hold off or can eat what they want, but it's not like that for everybody. Everybody has a sense of interoception and some people just know what their bodies need and can cope with that.