Full Definition

Malnutrition is significantly underrecognized in older adults and represents one of the most impactful, modifiable factors in geriatric health. It affects an estimated 15–30% of community-dwelling seniors and far higher proportions in hospital and long-term care settings. In older adults, malnutrition manifests as unintentional weight loss, muscle wasting (sarcopenia), micronutrient deficiencies, and inadequate protein intake.

Causes of malnutrition in seniors are multifactorial: reduced appetite (often from medications, illness, depression, or reduced taste and smell), dysphagia that limits food intake, social isolation reducing meal motivation, cognitive impairment causing forgotten meals, financial constraints, and institutional food quality or presentation problems.

The consequences of malnutrition are severe: impaired wound healing (critical for surgical and pressure ulcer recovery), weakened immune function, muscle weakness increasing fall risk, impaired medication metabolism, worsening cognitive function, and increased mortality. Malnutrition is both a cause and consequence of functional decline.

In quality senior care settings, nutritional assessment begins at admission, registered dietitians develop individualized nutrition plans, weight monitoring occurs regularly, and unintentional weight loss triggers clinical review. For families, consistent weight loss in a parent in a care facility is a warning sign that warrants direct questions to the nursing and dietary staff.