问答题 "Food desert" is a term that describes geographic areas where mainstream grocery stores are either totally absent or inaccessible to low-income residents because of high prices and inadequate public transit. While typically associated with large urban communities, this phenomenon also occurs in rural neighborhoods that suffer from inferior schools and substandard housing. From a lack of fresh vegetables arise significant negative health impacts, foremost among which is obesity that is linked to an array of serious illnesses. The prevalence of junk food is going to have deadly consequences. It takes more than determination to improve the availability and affordability of healthy foods for victims of "food desert".