Turtles...can or can't eat Iceberg lettuce?

I have painted turtles and someone was being really rude to my one question. He then got to the point of iceberg lettuce....
What is wrong with Iceberg lettuce and can Painted turtles eat it?
I haven't fed my painted turtles Iceberg lettuce b/c my friend was talking about it when she had her turtle(year ago)
Update: If you know of a lettuce that they can eat or should eat, tell me. Also if you know of any other food tell me.
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