Do the good folk eat wheat?

Has anyone ever come across "fairies do not eat wheat" in their lore/work before?

I did some actual Work last week and got a sense that I should be tabooing wheat, possibily dairy (because fruit and meat can be found in the forest) for this period. I can't do it; I struggle eating enough as it is, esp with the lockdown - it's a lot of extra planning and spoons that I won't be able to find.

But I've had similar feelings before, the Folk saying "we do not sow or reap, we take", and agriculture being specifically associated with mortals - whereas the Good Folk have fruits and meat, and possibly dairy (am I remembering this correctly? Either fairy cattle, or fairies wanting to do stuff with your cattle all the time) - but never wheat.

& this fits into some other stuff I'm doing, like wheat == Solar == mortal, associated with the rising and falling of the year and things which themselves rise and fall (the Good Folk are Lunar - they wax and wane from strength to strength, but do not die), and that bread-baking is a very Solar activity.

But I'm wondering if this lore actually comes from anywhere. Anyone have examples of the Good Folk interacting with wheat, or know where I might have got this "don't eat wheat" concept from?

Also welcoming simple ideas for lunches, breakfasts and dinners which don't include grain...