Originally Posted by Regina Schmid

Checking Google as for the nutrition of lettuce, I found the following:

Wikipedia:

Lettuce is a fat free, low calorie food and is good for a well balanced
diet. It is a valuable source of vitamin A and folic acid. Lactucarium (or
“Lettuce Opium”) is a mild opiate-like substance that is contained in all
types of lettuce. Both the Romans and Egyptians took advantage of this
property eating lettuce at the end of a meal to induce sleep.

On Nutrition Facts you will find detailed
information about the contents of iceberg lettuce.

There is more information in the internet. Just check "iceberg lettuce". It
is that simple.

Regina
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