@Butter-Girl depending on how far you moved, there might be some trees close by. It wasn’t until I identified what a black walnut fruit looked like that I realized they’re all over around me, mostly on public land.
Yeah, I imagine an occasion single nut off the tree isn’t going to do much harm. I still wouldn’t make a habit of it, but I wouldn’t fret over it either.
Considering the work involved, most people wouldn’t bother getting to the point of overeating them straight off the tree.
I know that TerraSoul sells some nuts direct from refrigeration when you buy from their website. I used to get their Brazil nuts and keep them cold, eating one a day for selenium, after scraping the skin off *a seed/nut’s skin is where their phytic acid is concentrated, and that stuff will bind up important nutrients, including but not limited to calcium, magnesium, zinc, selenium, and potassium. Contrary to what you read online, soaking doesn’t always fix this, especially if the seed/nut isn’t viable to sprout (heat treated/irradiated/broken/deshelled in some cases)
I definitely second what LucH said in regards to using Vitamin E to reduce harmful effects.