Bred in late 19th-century America, this pale and crispy salad vegetable brings fabulous texture to dishes, but it lacks the essential nutrients packed into greener leaves. "Iceberg lettuce provides a nice crunch but is low in nutrients, mostly consisting of water with a bit of fibre," says Jordan. "It's good for adding texture to salads, but it's not a nutritional star." Upgrade to a darker romaine or cos lettuce to get a little more nutritional value.

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Last updated by Laura Ellis.

The most nutritious vegetables to eat – and the ones with almost no benefits