What are signs your body is not absorbing nutrients properly?

When your body isn't absorbing nutrients properly, you may notice persistent fatigue and weakness even after adequate sleep, since cells aren't getting the fuel they need. Unexplained weight loss despite eating enough is another common sign, along with bloating, gas, diarrhea, or pale and greasy stools, which indicate undigested fats passing through. Physical signs include brittle nails, hair loss, dry skin, and mouth sores, often pointing to deficiencies in iron, zinc, or B vitamins. Bone pain or frequent fractures can suggest poor calcium or vitamin D absorption. Anemia, muscle cramps, numbness or tingling in the extremities, and a weakened immune system with frequent illness are also red flags. Persistent symptoms warrant medical evaluation including blood tests.