Absorption is the process by which nutrients, drugs, or other substances are taken up from the gastrointestinal tract or other sites into the bloodstream or lymphatic system. It is crucial in clinical practice as it influences the efficacy of medications and the nutritional status of patients; impaired absorption can lead to deficiencies or treatment failures. A key example is the malabsorption syndrome, where conditions like coeliac disease hinder nutrient uptake, resulting in significant health complications.

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