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.
The rich supply of vitamin A and vitamin C found in romaine lettuce helps to protect against eye disorders. Deficiencies in these antioxidants can lead to a thickening of the cornea, glaucoma, cataracts, macular degeneration, and possibly even blindness as one ages.our body does not make powerful vitamin C on its own naturally and relies on foods high in vitamin C. The body also does not store vitamin C, so it is important that you get this essential vitamin frequently from whole food sources including leafy greens like romaine lettuce.