My ROT is that just about any leaves or stems are going to be OK, in just about any quantity I can stomach, and I need to look out for the real storage parts of a plant--fruits and tubers. Where is the plant saving up for the next generation? Plants don't invest very heavily in leaves.

there was a discussion a while back about bamboo shoots, but they don't carry them in the local Food Lion and I'm not too worried.

As noted above, it wasn't the lettuce that got me here. However, my all-time biggest problem binge food WAS apples. I have noticed I do ok if I keep the salads to the leaves-and-stems parts.