Oh no! I gave my guinea pig iceberg lettuce! Will he die?

'Iceberg lettuce - this won't kill your guinea pig if you give him or her a little piece, but it has virtually no nutritional value, is quite fibrous and watery. It's been known to give guinea pigs diarrhea. With the great selection of other more leafy, dark lettuces available, just avoid this one and go with one of the others.'