Yes - the term (at least here in the US) for such areas is "food desert". In short, it is an area where there is no grocery store / supermarket to get fresh, healthy food. Thus, people end up getting their food from what is close (convenience store, bodega, dollar store, etc). Most of these places sell heavily processed junk food for high prices. The people eat junk that makes them fat, because that is what is available.
As pointed out these are often in poor urban areas, but can occur in poor rural areas as well and are actually more common in rural areas.
Notice the commonality between the areas? Yup.. poor, low income areas.
Although dated (from 2011) the government has maps of them available here.
ERS's Food Desert Locator is a mapping tool that presents a spatial overview of where food deserts are located and provides selected characteristics of the populations that live in them.
www.ers.usda.gov