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ASPEN/Academy guidelines define moderate malnutrition in acute illness as intake <75% for ≥7 days, 5–10% weight loss, and mild-to-moderate physical findings. Severe malnutrition would require >10% weight loss or severe exam features. This classification ensures accurate coding and intervention.

Tolerance to EN is best judged clinically—patients with stable vital signs, soft nondistended abdomen, and no vomiting or significant discomfort are considered tolerant, regardless of residuals. Absence of bowel sounds is not a contraindication to EN and does not predict intolerance. Gastric residual volumes (GRVs) are often used, but evidence shows poor correlation with aspiration risk or EN tolerance; many guidelines recommend reducing emphasis on strict GRV cutoffs. Daily stool output reflects colonic function, not necessarily tolerance of upper GI EN. A holistic assessment—abdominal exam, emesis, abdominal pressure, and hemodynamic stability—guides safe advancement of EN. This clinical approach reduces unnecessary interruptions and improves delivery of prescribed nutrition, which is critical in critically ill and recovering patients.

Copper deficiency can cause neurologic dysfunction, including myelopathy and sensory ataxia, resembling B12 deficiency. It also causes anemia and neutropenia. Selenium deficiency causes cardiomyopathy, chromium deficiency causes insulin resistance, and zinc deficiency causes dermatitis. Monitoring copper in long-term PN is essential.

Vitamin A deficiency impairs rhodopsin regeneration in the retina, leading to night blindness as an early symptom. Severe deficiency can progress to xerophthalmia, keratomalacia, and blindness. Patients on long-term malabsorptive states or PN without adequate supplementation are at risk. Vitamin E deficiency causes neuropathy and hemolysis; vitamin K deficiency causes coagulopathy; vitamin D deficiency leads to rickets/osteomalacia. Vitamin A supplementation in PN (~3300 IU/day in adults) prevents deficiency. Clinical suspicion should arise in PN patients with ocular symptoms.

Autonomy gives competent patients the right to refuse or discontinue medical treatment. The clinician must respect the choice, ensuring informed decision-making and offering comfort care. Continuing PN against the patient’s will is unethical. Family or legal intervention is unnecessary when patient autonomy is clear.