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.
One cup of shredded green leaf lettuce contains 133 micrograms of vitamin A, which is 15 percent of the 900 micrograms men need each day and 19 percent of the 700 micrograms women should have on a daily basis.eaf lettuce is the star in salads, and salads are perhaps one of the most nutritious foods, provided that they're not drowning in high-fat salad dressing and topped with unhealthy ingredients such as bacon.