Having lettuce in your poop is often a result of your body not being able to digest the lettuce fully, which then allows the undigested lettuce to end up in your poop.
Lettuce is naturally high in fiber and the human body cannot fully digest all that fiber in lettuce so the undigested fiber passes through your system and then appears in your poop.
Lettuce contains a type of fiber that humans can't break down which is called cellulose and if you don't chew the lettuce thoroughly it can also result in larger pieces of the lettuce passing through your digestive system without being fully digested.
Healthy poop should appear as and look like a sausage or log with a smooth surface and be relatively easy to pass and be brown in color.
However healthy poop can be either brown or even green in color and still be healthy.
A healthy poop, should reflect a mixture of all the colors of the food you eat and that bile.
Almost any shade of brown, or even green, is considered OK.
Normal poop color is brown.
This is due to the presence of bile in the stool.
Normal poop color can range from light yellow to brown to almost black.
However if your poop is red, maroon, black, clay-colored, pale, yellow, or green this may signify a problem.
Bile from the liver creates the typical brown hue of a healthy bowel movement.
When the poop is very pale, it often means that not enough bile is reaching the poop.
Problems with the gallbladder, pancreas, or liver are reasons why poop may not contain enough bile.
Normally poop should be brown, have a peanut-butter texture, and look like a sausage.
If you have abnormal colors, it may be due to something you ingested.
But it may also be due to serious illness.
If it's abnormal once, it's likely nothing to worry about.
Symptoms of an intestinal blockage include severe belly pain or cramping, vomiting, not being able to pass stool or gas, and other signs of belly distress.
Floating poop is often an indication of high fat content, which can be a sign of malabsorption, a condition in which you can't absorb enough fat and other nutrients from the food you're ingesting.