Scary! I have been blending apples with seeds for a long time because I read in one of the books (probably by a very famous raw foodist - I don't want to name the book without verifying and I don't have the book with me right now) that apple seeds contain iodine and raw foodists need it because we don't use iodized salt.
It appears from the above that we should not be eating sweet potatoes raw.
Also, I thought that potato skin is nutritious - the source below says that it is toxic.
I will only comment on the apples. While apples do have cyanide, the body is fully capable of processing it and therefore it doesn't matter. In fact, every healthy cell in the body is capable of neutralizing the poison - except for, you guessed it, cancer cells. When the poison comes into contact with healthy cells, it is neutralized; when it comes into contact with a cancer cell, the cell is destroyed. Sounds like a good deal to me. I'll keep eating my apples thank you.