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.
Romaine Lettuce Benefits: Romaine lettuce is, first and foremost, a low calorie vegetable. It is high in fiber and water content, too, making it a suitable food for individuals looking to manage or lose weight. Romaine lettuce has heart-healthy benefits, too. As it turns out, the fiber in this leaf vegetable binds with bile acids. The latter are primarily made up of cholesterol which the liver makes to aid in the process of storing fats in the body. When you eat romaine lettuce, its fiber binds with bile acids and both get eliminated via the bowels.