CSflim

But wheat does not have the ability to feel pain.
This should be quite clear from the point of view of evolution: Wheat simply cannot take any action to avoid the threat to its well being (source of 'pain'), hence it would not evolve the entirly usless ability to feel pain.
This is in confirmation with what we observe: the reaction of wheat to being cut up does nothing to suggest to us that it feels pain (unlike a dog or a human).

This is also backed up from the anatomy of wheat: its lacks a central nervous system and a brain!

Hence eating wheat and other plants is acceptable. Eating animals is not.

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