Types of Food

Foods that help to open the heart chakra are namely green fruits and vegetables. These include peppers, grapes, kiwis, cucumbers, and many other green vegetables. 

http://transformfxfitness.com/2013/03/benefits-of-green-fruits-and-vegetables-happy-st-pattys-day/

Source:
http://www.yogabound.com/anahata-anahatha-4th-chakra-unbeaten-or-heart-chakra/
http://theresaann.hubpages.com/hub/anahata-the-heart-chakra