I think I've inadvertently hit a hot spot. Or perhaps everyone's love for piggies makes them a bit quick to criticize? It certainly doesn't help if I hand out ammunition by not being clear. I have no wish to misguide anyone.

When I said "iceburg lettuce is ok", I meant that YuselinMaikel who began this thread about his piggies who are eating iceburg lettuce and not having diarrhea is not giving his piggies something toxic. I should have spoken more generally. I give our piggies a piece of iceburg lettuce about the size of my thumb maybe once a week as a small part of a balanced diet of other greens and veggies. Please do not hear me say that iceburg lettuce should have anything more than a very small part in a piggie's diet.
That is a very nice chart you pointed out, pigsforlife and Jenni. Very thorough. One thing is has is serving size! Hooray! It's so nice to see charts with serving sizes. When planning a piggies diet serving size is very important. Apples, for example. A serving of 10.39g/1-2 times per week approximately equals a serving of 3-4g/3-5 times per week. We keep lots of veggies and fruit in the house, so I just prefer to give our piggies a lot of variety daily with smaller amounts of each veggie than to give a full serving at one time.