Plants may be sentient beings like animals so how do you decide what to eat?

There is some evidence that plants are 'sentient beings' and can communicate (e.g. see [this article](http://www.pri.org/stories/2014-01-09/new-research-plant-intelligence-may-forever-change-how-you-think-about-plants) or [this wikipedia page](http://en.wikipedia.org/wiki/Plant_perception_(physiology))) . However Buddhists believe eating meat is wrong because of killing a living entity, what about plants? If this is true what can you eat?