Set in a post-apocalyptic future, The Road (2006) follows a father and his young son heading south on a mostly deserted road, pushing a shopping cart with all their belongings. Any human they encounter is a threat to either steal their food or worse, to eat them as food. Every second is a fight for survival, and barely a page goes by where there is not a description of hunger. The father's sole purpose is to keep his son alive.
I would recommend this Cormac McCarthy title to readers of dystopian fiction.
Check out our list Welcome to Dystopia for more ideas.