Is oatmeal, cubers, and apples bad for iguanas?

I feed my iguana all the necessary foods he needs to eat to be healthy but he likes to climb down my shoulder when I'm eating these certain foods, so i let him have a couple bites. I haven't found any information in iguana diets if these foods are ok for him. If they're not ok I do not wish to continue feeding them to him as they could be harmful to his liver or anything else internally.