It depends on the nuts. I lived in a place that had an almond tree in the back yard and they're fine. I like them roasted and that's real easy, just put some almonds in a bowl with a knob of butter and microwave them for a few seconds.So nuts must be soaked and then roasted, seems lately lot more soaking and pre-prep....
In tropical regions a lot of traditional people use flour made from Cycad nuts to make bread. If they're not leached properly before using they are deadly.