I qualified control with a rather narrow question, I agree, but I genuinely don't understand what can constitute as not having control over what goes into your mouth if you are a high functioning adult who buys your own groceries/meals.
How about different hormones which drives hunger and outside of your conscious control, because you have a genetic predisposition to produce more of those?
I genuinely don't understand some people who talk like they have full conscious control over every minute of their day and their whole life.
Hormone signalling isn't control, if it were then society would cease to function and among many other terrible things you'd lose bodily autonomy as anyone who wanted to sleep with you and was strong enough to subdue you would do so every time they had the urge.
Actual daily levels of hormones or genetic predisposition have a huge effect on self-control or conscious control.
A relative of mine had a stroke which resulted in the loss of part of the brain. Most people don't have such a drastic stroke, but it's enough if you're born with a different gene and you have a slightly different connectivity in your cortex to not have as much self-control as the next person.
That's a clear example of you, as an adult, not having full control over what goes into your mouth. How much control do you have over what comes out of your mouth? Have you heard of foreign accent syndrome?
What control do you have over what your grocery store stocks? What control do you have over how much the food at your grocery store costs? How much control do you have over how much money you make?
All of these things contribute to what you end up putting into your mouth. But also, you don't have to imagine this, Just look up what percentage of the population is "overweight", and look up how that number has changed since we as a society went into a moral panic about it.