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Both iceberg lettuce and romaine lettuce contain vital nutrients that help us live our best lives. Iceberg is about 13 calories per serving while romaine is about 15 calories. However, romaine ...
Raw iceberg lettuce is 96% water, 3% carbohydrates, and contains negligible protein and fat (table). In a reference amount of 100 grams (3.5 oz), iceberg lettuce supplies 14 calories and is a rich source (20% or more of the Daily Value, DV) of vitamin K (20% DV), with no other micronutrients in significant content (table).
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It is known as lettuce opium because of its sedative and analgesic properties. It has also been reported to promote a mild sensation of euphoria . [ 1 ] [ 2 ] Because it is a latex , lactucarium physically resembles opium , in that it is excreted as a white fluid and can be reduced to a thick smokable solid.
Leaf vegetables most often come from short-lived herbaceous plants, such as lettuce and spinach. Woody plants of various species also provide edible leaves. The leaves of many fodder crops are also edible for humans, but are usually only eaten under famine conditions. Examples include alfalfa, clover, and most grasses, including wheat and barley.
Modern varieties of lettuce are only slightly bitter or not at all, such as iceberg lettuce and romaine lettuce. However, in the past domestic lettuce was bitter, and heirloom varieties of lettuce that are bitter are still available to gardeners. Romaine lettuce is the most commonly used variety, perhaps because it still preserves a slight ...
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