This is true. For food deserts, sometimes lacking grocery stores, fast food is sometimes the only practical option. Convenience stores, bodegas, dollar stores,

This is true. For food deserts, sometimes lacking grocery stores, fast food is sometimes the only practical option. Convenience stores, bodegas, dollar stores, and fast food chains charge high unit prices and the majority of residents have little choice except to commute long distances to big box stores if they had the time, money, and transportation to do so which they probably don't. In these cases, demand for fast food becomes more inelastic where there are fewer or no other options. This is in contrast to areas with very high residential property values and lower BMIs where fast food shops are distant and uncommon.