Confusion about vegetables

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When I shared my post about the smoothie a days ago. After I opened up about adding a lettuce as ingredient, one of the responder claimed by her friends doctor that lettuce had no vitamins what so ever. Then she waited for clarification from another mylotter and it turns out that this one didn't like lettuce on the smoothie. I learned that there's another term for cabbage and they called it iceberg lettuce. And this were the confusion came from, turns out they were about another vegetable. I could be wrong, maybe they're still confused...like me But it was a good discussion. Despite of that I would still think of adding lettuce to the smoothie but I still have mustard and bokchoi so not yet.