For me being food "sober" is a combonaton of what i eat AND how much I eat. If I eat a moderate amount of protein and carbs, with plenty of fiber and green vegis then I feel good. When I eat lik that a little refined sugar doesn't seem to make feel to lousy. So an example would be if I ate 4-5 oz of beef (which is usually considered 1 1/2-2 servings by nutritionists) half a potato with skin and reduced fat sour cream, a salad with vinaigrette, and a cup of broccoli with a teaspoon of butter or a little vinaigrette. This would be a fairly large meal volume wise, but it wouldn't make me feel lazy and bloated. If I were to then eat a single serving of cheesecake then I normally would still feel pretty good, and have decent energy.
on the other hand, on days where I decide to not be food "sober" I might order a pizza, eat 3 or 4 slices, maybe eat a salad maybe not, and then at desert the cheesecake makes me go from feeling full and sleepy to just plain lousy.
Ive even had days where I start with the more balanced meal, but when I want more and go back for seconds, only the starch and meat make it on to my plate. I don't even dislike the vegis, I just think thy don't provide the same experience as meat, fat, and starch/sugar. So when you say food sober that is what it means to me. It is pretty much a seperate issue from weight loss, and is much more about how I feel when I'm done eating.