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.
Soil pH measures the acidity of the soil. Romaine lettuce requires a neutral pH between 6.0 and 6.5. Existing successful vegetable garden soil usually falls within this range. For new beds, a soil test determines the pH. Use a home testing kit or take a soil sample to a testing laboratory to determine pH.omaine lettuce (Lactuca sativa) produces an upright head of large loose leaves. The crisp leaves and firm central rim make it a prized fresh addition to salads. Like most lettuce, romaine grows best in cool weather when the temperatures are above freezing, but below 80 degrees Fahrenheit.