Even a seemingly healthy salad from a fast food restaurant is often light on fiber—simple lettuce greens provide only about 0.5 grams of fiber per cup. Look for salads that include other vegetables, and whenever possible, up the fiber content by adding your own nuts, beans, or corn.

Dark Leafy Vegetables These plant foods are great sources of folate and a host of vitamins and minerals. They also provide a punch of fiber that help clear your colon. It’s important to note that not all leafy vegetables are created equally. A cup of iceberg lettuce, for example, has nearly no nutritional value.

Canned or cooked vegetables such as green beans, carrots and potatoes (without the skin) Eggs, fish and poultry. Refined white bread. Fruit and vegetable juice with no pulp.

Eat high-fiber cereals. Vegetables can also add fiber to your diet. Some high-fiber vegetables are asparagus, broccoli, corn, squash, and potatoes (with the skin still on). Salads made with lettuce, spinach, and cabbage will also help.

After dealing with chronic bloat and stomach problems, I decided to ditch salads. Raw, cruciferous vegetables are tough to digest because they’re fibrous. If you have an unhealthy gastrointestinal tract or food sensitivities, then you’re more likely to have a bad reaction to digesting raw vegetables.

Butter lettuce may be easier for some people to digest because it has a low fiber content; however everyone reacts differently to different fruits and vegetables.

You may occasionally experience stomach pain after eating salads. It’s hard to believe that something as innocuous as lettuce could cause stomach pain. However, many people find that they have stomach cramps and diarrhea after eating salad, and sometimes it’s pretty severe.

Vegetables high in water such as lettuce, celery, watercress, asparagus, cucumber, peppers, tomatoes and radishes digest in 30-40 minutes. Cooked leafy and cruciferous vegetables such as kale, brussel sprouts, broccoli, cauliflower and bok choy digest in around 40-50 minutes.

This usually is high-fiber vegetable matter, which normally isn’t broken down and absorbed in your digestive tract. Undigested food in stool isn’t a problem unless it’s accompanied by persistent diarrhea, weight loss or other changes in your bowel habits. If you have such signs and symptoms, consult your doctor.

E-coli can cause vomiting, diarrhea, and severe stomach cramps. The strain of E-coli in this lettuce is particularly dangerous, however, as it can cause kidney failure.

After you eat, it takes about six to eight hours for food to pass through your stomach and small intestine. Food then enters your large intestine (colon) for further digestion, absorption of water and, finally, elimination of undigested food. It takes about 36 hours for food to move through the entire colon.

The gastrocolic reflex is a normal reaction the body has to eating food in varying intensities. When food hits your stomach, your body releases certain hormones. These hormones tell your colon to contract to move food through your colon and out of your body.