Where would most likely be evidence that the person is not digesting food correctly?

The most likely place to find evidence that a person is not digesting food correctly would be in their feces. Undigested food particles or excessive amounts of fat in the feces can indicate that the person is not properly breaking down and absorbing nutrients from their food. Other signs of malabsorption, which is the medical term for incomplete or impaired absorption of nutrients from food, can include:

Changes in bowel movements, such as diarrhea, constipation, or both.

Abdominal pain or discomfort.

Bloating or gas.

Weight loss or difficulty gaining weight.

Fatigue or weakness.

Skin rashes or other skin problems.

Brittle nails or hair.

If you are experiencing any of these symptoms, it is important to talk to your doctor to determine the cause and get proper treatment.