These substances cause excessive amounts of water to remain in the stool, leading to diarrhea. Certain foods (such as some fruits and beans) and sugar substitutes in dietetic foods, candy, and chewing gum (for example, hexitols, sorbitol, and mannitol) can cause osmotic diarrhea.
The four most common types of green lettuce -- green leaf, romaine, butterhead and iceberg -- have 13 to 17 calories in 100 grams, which is about a 1/2-cup serving of shredded lettuce. They deliver 1 gram of protein, or about 2 percent of the recommended daily intake.
In addition, romaine lettuce is a very good source of dietary fiber, manganese, potassium, biotin, vitamin B1, copper, iron, and vitamin C. It is also a good source of vitamin B2, omega-3 fatty acids, vitamin B6, phosphorus, chromium, magnesium, calcium, and pantothenic acid. link that takes you to the In-Depth Nutritional Profile for Romaine lettuce, featuring information over 80 nutrients, can be found under the Food Rating System Chart. In addition to the nutrients highlighted in our ratings chart, an in-depth nutritional profile for Romaine lettuce is also available.