Malnutrition in Older Adults: Signs and Prevention

What malnutrition means

Malnutrition is a state resulting from a lack of intake or absorption of nutrition, leading to altered body composition (loss of fat and muscle) and diminished function. Definitions used by clinicians (such as the ESPEN criteria) include unintentional weight loss, a low body mass index or low muscle mass, and reduced food intake or illness that affects absorption. It includes protein-energy undernutrition and deficiencies of vitamins and minerals such as vitamin D, B12, iron, calcium and zinc. It overlaps with frailty and sarcopenia; see sarcopenia: muscle loss, protein and strength and frailty in older adults: what it means and what helps.

Why it matters

Undernutrition in older adults is linked with:

• Muscle loss, weakness, falls and fractures.
• Reduced immunity and more infections.
• Slow wound healing and a higher risk of pressure sores; see pressure ulcers: stages, wound care and prevention.
• Longer hospital stays, more complications after surgery and slower recovery.
• Low mood, tiredness and poor quality of life.
• Greater dependence and higher mortality.

Risk factors

• Illness: heart failure, COPD, kidney disease, cancer, infections, diabetes, thyroid disease, gastrointestinal problems, chronic pain, tuberculosis.
• Poor appetite; see loss of appetite in older adults: causes and practical fixes.
• Dental and swallowing problems; see teeth, dentures and eating well in later life and swallowing problems (dysphagia) in older adults.
• Medicines that reduce appetite, cause nausea, dry mouth or taste change, or interfere with nutrients; see polypharmacy and deprescribing.
• Dementia, depression, grief, loneliness; see dementia, eating and weight loss and depression in older adults.
• Physical limits: poor mobility, tremor, arthritis, poor eyesight, breathlessness while eating, difficulty shopping or cooking; see eating with tremor or weak grip.
• Social and economic: living alone, dependence on a cook, financial strain, food insecurity, bereavement.
• Restrictive diets: over-restricted diabetic, low-salt, low-fat or vegetarian diets without planning; religious fasting; see fasting, festivals and older adults: staying safe.
• Hospital admission or recent illness.
• Alcohol, tobacco and substance use.
• Digestive disorders and malabsorption.

Signs of undernutrition

Visible - Unintentional weight loss, and loose clothes, belts and dentures. - Thin arms, legs and face, prominent bones, muscle wasting. - Small portions, skipping meals, leaving food on the plate. - Tiredness, weakness, slower walking, difficulty rising from a chair. - Frequent infections, slow healing of cuts or sores. - Pale skin, dry hair, brittle nails, sore mouth or tongue. - Swollen ankles or feet (in severe protein deficiency, or from other causes). - Feeling cold, dizziness, low mood, poor concentration, irritability. - Falls.

Measurable - Weight, the single most useful measure; see weighing scales and unplanned weight loss in older adults. - Body mass index (BMI): below about 20 to 22 in older adults is a warning (some guidance uses 20 for under seventy and 22 above seventy); the doctor interprets. - Mid-upper arm or calf circumference: a nurse or dietician can measure; a very thin calf suggests low muscle. - Blood tests (albumin, haemoglobin, vitamins) are not reliable alone but support the picture.

How to screen at home

A simple approach, adapted from validated tools such as the Malnutrition Universal Screening Tool (MUST) and the Mini Nutritional Assessment short form, asks:

1. Has your parent lost weight unintentionally? Roughly 5 per cent loss over three to six months (for example 3 kg from 60 kg) is a concern; 10 per cent or more is high risk. 2. Is the BMI low? Weight in kilograms divided by height in metres squared; under about 20 to 22 raises concern. 3. Is the person eating much less than usual, and for how long (more than five days is a worry), or acutely ill with no food intake expected? 4. Any chewing, swallowing or mouth problems? 5. Any recent illness, hospital stay, surgery or stress? 6. Any mood change, memory problems or reduced mobility? 7. Any problem shopping, cooking or feeding?

If several answers are yes, ask the doctor or a dietician for a proper assessment. Keep a weight chart: weigh weekly, at the same time of day, in light clothing, on the same scale; record and compare.

What to do: food first

### 1. Treat the causes

See the doctor to review illnesses, medicines, mood, pain, constipation, mouth and teeth, swallowing and any signs of infection. Treat what can be treated. Many problems, such as poor teeth, dry mouth or constipation, have simple solutions.

### 2. Little and often, fortified

• Offer three small meals and two to three snacks or drinks daily, at times of day when the person is hungriest, often morning.
• Fortify, without increasing volume: add ghee, oil, butter, milk powder, grated paneer, mashed egg, ground nuts, nut butter, besan or sattu, seeds, cream or full-fat milk to everyday foods, as the dietician advises, taking account of heart disease, diabetes, kidney disease; see loss of appetite in older adults: causes and practical fixes.
• Protein at every meal: dal, eggs, dairy, soya, nuts, fish, chicken; see how much protein do older adults need and high-protein Indian meals for seniors.
• Energy-dense choices: khichdi with ghee, paneer parathas, kheer, halwa, milk-based shakes with banana or mango, nut laddoos in small portions, curd with jaggery.
• Do not impose "light" diets such as thin soups, plain rice and dal water, or strict fat-free regimes, on someone who is losing weight.
• Relax unnecessary restrictions where the doctor and dietician agree: for example, strict salt, sugar or fat restriction in someone with poor intake may be eased to improve eating; this must be a medical decision.

### 3. Make eating easy and pleasant

• Eat together; company improves intake.
• Comfortable, upright seating, good light, glasses and dentures in place.
• Familiar, favourite and culturally appropriate food, with appealing colour and aroma.
• Texture adjustments: soft or pureed foods for chewing or swallowing problems, with speech therapist advice; see soft and pureed diets.
• Adaptive cutlery and cups; see easy-grip cutlery guide.
• Assistance with feeding without hurrying; see feeding someone who cannot feed themselves.
• Drinks between meals, not before; see hydration for older adults: how much and how to remember.

### 4. Supplements when needed

If dietary changes are not enough, the doctor or dietician may prescribe or recommend:

• Oral nutritional supplements (sip feeds), between meals, typically one to three servings daily; see nutrition supplements and sip feeds: when food is not enough.
• Protein powder added to food; see protein powder for older adults: who needs it and how to choose.
• Vitamin and mineral supplements for proven deficiencies, such as vitamin D, B12 and iron; see vitamin D deficiency in India, vitamin B12 in older vegetarians and iron and anaemia in older adults. A multivitamin may help if intake is very low; see multivitamins for older adults: helpful or wasteful?.
• Tube feeding in selected cases, a medical decision in consultation with the family, with specialist teams.

Check with the doctor or pharmacist about interactions and conditions such as kidney disease, diabetes and blood thinners before using supplements; see supplements and medicine interactions: a safety guide. Never stop or change prescribed medicines because of supplements.

### 5. Movement and strength

Gentle activity stimulates appetite and rebuilds muscle; see chair exercises for seniors and resistance band routine for seniors.

### 6. Monitor and review

• Weigh weekly; aim for stable or rising weight. Record intake for a few days.
• Review every two to four weeks with the doctor or dietician; adjust the plan.
• Reassess the causes if there is no improvement.

Red flags: see a doctor soon

• Unintentional weight loss of 5 per cent or more in three to six months, or rapid loss.
• Not eating for several days, or very low intake with weakness.
• Difficulty swallowing, coughing at meals, or pain on eating.
• Persistent vomiting or diarrhoea; see diarrhoea and dehydration in older adults.
• Blood in stool or vomit, black stools.
• Swollen legs or abdomen, breathlessness.
• Confusion, drowsiness or new falls.
• Sores that do not heal.
• Low mood or hopelessness.
• Signs of dehydration: dark urine, dizziness, dry mouth; seek urgent help for severe symptoms; call 112.

When to ask a professional

Ask the doctor to look for causes of weight loss and poor intake, and to review medicines. Ask a dietician for a personalised, culturally suited plan. Ask a dentist and a speech and language therapist about teeth and swallowing. Ask a pharmacist about supplement quality and interactions. Seek help promptly for rapid weight loss, inability to eat or drink, or signs of dehydration or infection.