Sources of food include the general public, sometimes in the form of “food drives,” and government programs that buy and distribute excess farm products mostly to help support higher commodity prices. Food banks can also buy food either at market prices or from wholesalers and retailers at discounted prices, often at cost. Sometimes farmers will allow food banks to send gleaners to salvage leftover crops for free once their primary harvest is complete. A few food banks have even taken over their own farms, though such initiatives have not always been successful.

Many food banks don’t accept fresh produce, preferring canned or packaged food due to health and safety concerns, though some have tried to change this as part of a growing worldwide awareness of the importance of nutrition. As an example, in 2012, London Food Bank (Canada) started accepting perishable food, reporting that as well as the obvious health benefits, there were noticeable emotional benefits to recipients when they were given fresh food.