A new iOS app called LeftoverSwap allows users to exchange what is in their refrigerators with others. The free app allows Apple users to upload photos of leftovers for others to eat.

The basis of the app connects neighbors who want to give up or take unwanted food. By using GPS location and chat features, people with food link up with hungry people and hand over the food. However, there are possible health concerns raising some attention.

According to their website, LeftoverSwap encourages people to exchange food, which helps by "reducing waste, eating locally, and want to build [community] relationships."

With other peer-to-peer sharing services like Kickstarter and Uber growing in popularity, LeftoverSwap hopes to help feed others and reduce food waste.

Food waste is a serious problem in the U.S., and many other companies are trying to do their part to reduce uneaten food. LeftoverSwap stated that 40 percent of food produced ends up wasted.

"LeftoverSwappers don't feel the need to eat an enormous restaurant portion, and instead pass it on to a hungrier neighbor, in turn learning their name and avoiding excess calories," the company said on its website. "Through increasing the efficiency of each plot of land dedicated to food production, we can reduce our intensive use of natural resources, and reduce our expansion into sensitive environmental areas."

Farmers and producers are able to donate surplus crops to food banks through Food Cowboy and Cropmobster. In Europe, tens of thousands of users joined similar services to LeftoverSwap such as FoodSharing.de.

Health officials are worried that LeftoverSwap might spread food-borne illnesses through distributing partially consumed food. FoodSharing.de does not allow eggs, raw meat or fish to be traded for this very reason.

Developers have only released an iOS version, but state on their website that web and Android versions of LeftoverSwap will be available soon.