Before the advent of the variety of salads, there were only 2 lettuce - the Romaine/Cos and the Icebergs ... at least in my world. Now, one can find such a variety of lettuce, it can take quite a bit of time to pick the (type of) lettuce at the supermarkets.
Variety there may be, but the Romaine/Cos wins hands down for the most nutrients of all ... that is if we consider water is not a nutrient. But water IS one of the essential nutrients. So, I would have to say, all lettuces are made equal but not equal in the variety of different nutrients they contain, nor the amounts of nutrients for each type of nutrients they contain.
For example, Romaine/Cos is high is Vitamin K while Icebergs are high in water contents. Equal amount of nutrients - just different types in different amounts.
Water contents aside, Romaine/Cos has been suggested to contain the most variety of nutrients and, antioxidants for that matter.
(Romaine/Cos, please take a bow)
Now Found/Grown in:
Apparently, it's name "Romaine" is derived from its passage of transportation to the West (in the ancients days), from Rome.
"Cos", on the other hand, is suggested, that is where it was introduced ... the Greek Island of Cos.
Romaine or Cos, it's now the famous ingredients in a lot of salads.
And it's ancestors were thought to be a weed until the Egyptians made it a symbol of a God - the fertility God, Min.
It has come a long way and developed into different varieties.
Romaine/Cos is one of the better known ones and is synonymous with the word "salad". Although these days, some salads are known not to have one leave of lettuce in them!
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