Adherence

Modifying food retail access (availability, proximity, or price) does not have a profound or independent effect on dietary consumption or obesity levels.

Simply building a supermarket in a food desert is unlikely to solve obesity or improve diet quality on its own. If you are on a tight budget, focus on 'economy' lines which can be as healthy as standard products, and prioritize food budgeting strategies over relying on the proximity of a single store type.