I think you can still help as a doctor; on a side note, this can also be done with more attention in some kind of home healthcare system, maybe?
It's just a thought. With some more individualized attention in a home healthcare support system for certain individuals who cannot walk due to their diabetic condition or age, you could potentially help them (may need to coordinate with their family as well and with their food preferences or culture). It is a bit difficult sometimes though I'd imagine... (In terms of someone possibly craving or going back to certain behaviors....)
I also think it can be targeted (this goal of "healthy eating") by looking into several possibilities:
1) Maybe on the business/culinary side, help with supporting some kind of "healthy eating" options and nutritional education?
2) On the research side, help with checking the genetics related to certain people's responses to certain diets? Sometimes diet needs to be individualized to some extent, taking into account of biological, psychological, sociological factors... et cetera (For example, cancer cells typically exhibit the "Warburg effect" meaning that cancer cells typically rely predominantly on glucose, upregulate glucose transporters, and the cancer cell's mitochondrial activity seems to be impaired, i.e., cancer cell's mitochondria not being able to process lipids for beta-oxidation and amino acids for ketogenic purposes as efficiently compared to normal cells, but instead seem to rely mostly on glucose.) Carbohydrates are still important to some extent of course, but maybe some kind of education on different kinds of carbohydrates? Oh well. Maybe finding some kind of balance of providing some low-carb options (useful for some diabetics and those looking for a keto-related diet) that an individual will find palatable and thus likely to at least adhere? . . .
3) Starting early with childhood education? We have to be careful of course, nutrition guidelines tend to change over the years and it can be difficult for some people to take the general advice (again, individualized attention may help, with respect to cultural foods, questions, genetics) -- what are some things that you want to see changed? How can you help feed the children healthy food? How can you help educate the children and their parents on finding the "right" kind of foods to eat? (Just some questions that I'm thinking about.)
Just brainstorming. I hope your day goes well. 🙂