That's such a simplistic look at weight gain lol. Wanting food is caused by neurochemicals in your body first before you even eat a bite. Eg Prader-Willis patients gain weight because they have excess ghrellin which makes them super hungry. (It's obvious they do not have Prader-Willis).
Vitamins are over the counter. We are supposed to eat them every day. Doctors literally ask you if you eat a balanced diet as their first screening question because they are supposed to fix vitamin deficiencies first before treating anything else (lol as if they do that). I think adults, who walk by these same vitamins every day at the store and see ads for them, can read a vague internet comment that they know is a stranger, and know if they should talk to their doctor about their health conditions etc or not. I think they can decide for themselves if they want to try a vitamin regimen, that again, is over the counter and has recommended daily intakes by nutritionists so your body can function.
Further, there is no overdose range for vitamin k, as in, we haven't found an upper limit where it'll kill you, although if deficient in vitamin e, then blood clots can happen. COQ10 is likewise very safe. https://pubmed.ncbi.nlm.nih.gov/19096117/
Vitamin E is pretty safe unless you macrodose it every day for a while, and even then, as long as you've got vitamin k (and in some weightlifters do vitamin C) on board it shouldn't be an issue. And again, I never said to macrodose or gave any dose, so why the shaming and policing?
Last, most overweight people are eating a lot of animal products that contain retinol type vitamin a instead of beta carotene type vitamin a found in plants. Because of the way retinol works, you HAVE to absorb it. To deal with the extra retinol, you need vitamin e and vitamin k, so you start craving fats. Then often people want meat and cheese or a pasta with meat, lasagna, pizza, etc, (which btw I eat too and I eat meat) and yeah they get some vitamin k in that, but not enough vitamin e to deal with the retinol. Which then causes stuff like eczema, allergies, pink irritated skin, dry skin, headache, high blood pressure, nausea, diarrhea - the stuff on the accutane side effects list.
So the craving continues and feeds itself. I used to be hungry AFTER I ATE and wished I could eat more, and that's not uncommon in people who eat caloric excess - because they actually DO need to eat something else.
If you take vitamin e, it treats vitamin a overdose symptoms relating to the skin sloughing off and heightened immune system issues. But also vitamin e should be given with vitamin k since vitamin k is relatively benign anyway and helps produce osteocalcin which helps people exercise and want to move/feel good moving.