There are no rules there about how to crack a walnut to pick out the meat.
Reason? Yes, wheat is a domesticated product. There are risks associated with such things. Walnuts were not, at that time, domesticated. They came surrounded by an astringent cover that made sure anything inside (the nut) was as sanitary as it was going to get.
A wheat field provides perfect conditions for the growth of any number of poisonous plants. Wheat fields, of course, don't exist in a state of nature although wheat does.
I have absolutely no problem with the regulation of products produced by domestic animals, or in a condition of domestication, or further processed through fermintation or mold growth. Just none at all! I'm pretty sure God thinks the same way in these matters.
Actually, if you go to the Middle East where wheat and barley originated you can find wild wheat fields that yield quite a bit of wheat. Wild barley, too. Not as high a yield as cultivated fields with modern strains, but they’re there.
OTOH, you’ll never see a wild corn field. That crop does NOT exist in nature. It was genetically engineered by ancient Central Americans.
>> I’m pretty sure God thinks the same way in these matters. <<
So you speak for God now? This government is not God! Your total disregard for the constitution is striking as is your knowledge of Biblical principle. You probably also think the government should take the place of the Church in the care of poor and orphans.