I've always heard it's just a taste issue. Supposedly, they can upset your stomach, too, but I wouldn't worry about it. It happens when they grow too close to the surface, instead of being hilled up, or at least that's how it happens in my garden. If I don't get enough dirt piled up around the plants, the one near the top will be green. They're a little harder than the others, but I've never noticed a bitter taste or anything.

Just eat them.

 

I googled it and don't know if at my age now I would want to take the chance with the green one`s. When I was younger those would have been the least of my worries.