What is the theme in Angela's Ashes by Frank McCourt?

The hunger experienced by Frank, his family and many of his childhood friends and neighbors is palpable in this book. Frank is constantly in search of food, both for himself and for his siblings, and they all at one time or another are forced to steal and beg for anything to eat. On the holidays, they eat the heads of animals – the only part cheap enough to buy from the butcher.