If a patient has a medical condition that causes his cells to absorb fewer than normal molecules, this patient would likely feel very tired.

Fewer absorption of Oxygen molecules would likely make the patient feel very tired.

The body requires oxygen for the processing of metabolic activities. Oxygen molecule helps in the breakdown of several carbohydrates and proteins and results in the formation of ATP. ATP is the form of energy that makes us active and helps in doing work.

The lesser absorption of oxygen by the human body will result in the lack of supply of oxygen to the cells. In this condition, the activity of the body slows down. The slowed activity will result in the person feeling tired.

For more information about cells, refer the link:

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Oxygen

Explanation:

Hemoglobin helps carry oxygen around the body. When your body doesn't have enough hemoglobin, less oxygen reaches your tissues and muscles, depriving them of energy. In addition, your heart has to work harder to move more oxygen-rich blood around your body, which can make you tired