Geriatric Syndrome
Unintentional Weight Loss: Outpatient Workup
Unintentional weight loss of 5% or more over 6–12 months in an older adult is clinically significant and warrants a structured workup — it is independently associated with increased mortality, sarcopenia, frailty, falls, and undiagnosed malignancy or dementia. This guide presents a stepwise outpatient approach grouped by the 'Meals on Wheels' framework: medications (digoxin, SSRIs, metformin, NSAIDs), emotional issues (depression), elder abuse, late-life paranoia, swallowing problems, oral problems, no money, wandering and dementia, hyperthyroidism/hypothyroidism, enteric problems, eating problems, low-salt/low-cholesterol diets, social problems, and stones. Initial workup includes CBC, CMP, TSH, ferritin, B12, HIV when appropriate, age-appropriate cancer screening, chest imaging, and depression and cognitive screening. Covers when to escalate workup, when to involve dietitian and SLP, and when to reframe goals to comfort and quality of life.
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Outpatient Clinical Reference · Geriatric Syndromes
Unintentional Weight Loss Workup
MEALS framework · Stepwise lab workup · Medication causes · Intervention ladder
MEALS Mnemonic
Systematic approach to the 5 most common causes of unintentional weight loss in older adults.
Medications
Metformin, SSRIs, digoxin, opioids, topiramate, GLP-1 agonists — all reduce appetite. Review every medication and ask: did the weight loss start after a medication change?
Emotional (Depression)
PHQ-9 screening. Depression is the most common treatable cause. Mirtazapine treats both depression and appetite loss. Social isolation compounds the problem.
Anorexia of Aging
Physiologic decrease in appetite with age. Reduced taste and smell. Early satiety. Slower gastric emptying. This is real — but it is a diagnosis of exclusion.
Late-life (Dementia)
Forgetting to eat. Forgetting how to eat. Apraxia of swallowing. Resistance to eating. This progresses — plan ahead with family.
Social
Food insecurity. Cannot afford food. Cannot get to store. Cannot prepare meals. Lives alone and does not eat alone. Ask these questions directly.
References: Gaddey HL, Holder KK. Unintentional Weight Loss in Older Adults. Am Fam Physician 2021. · AGS Guidelines. · Morley JE. Anorexia of Aging. JAMDA 2012. · ASPEN Nutrition Guidelines 2021.
Evidence sources
- · AGS guidance on weight loss in older adults
- · Gaddey HL, AAFP 2014
Review status
Last reviewed: 2026-04
Reviewed by the MyClinicianGuide editorial team. Cadence: annual.
Educational reference for licensed clinicians (NP, PA, MD, DO). Not a substitute for clinical judgment, institutional protocols, or specialty consultation. Apply in context of the full clinical picture, patient goals, and current standards of care. See About AI guidance for AI-related limitations.
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