What if in their neighborhood there are new restaurants with cheap, plant-based foods too? And if packaged food with refined sugars (cereals) and unhealthy oils

What if in their neighborhood there are new restaurants with cheap, plant-based foods too? And if packaged food with refined sugars (cereals) and unhealthy oils got more expensive at the same time? Humans can change their diets. It would help to be subsidizing healthy foods instead of refined sugars.