Malnutrition signs in older people: what families can notice early
You visit your mum and something is different. The biscuit tin is still full, her cardigan hangs a little lower and she seems tired by lunchtime. This guide sets out the signs the NHS lists, how to work out whether weight loss is significant, what professionals check, and when to pick up the phone to the GP.
If you are nodding at two or more of these, read on.
Last reviewed 3 November 2026 · Checked against NHS guidance · 13 min read
What to look for first
The main sign of malnutrition, according to the NHS, is losing weight without trying, especially 5 to 10% of body weight within 3 to 6 months. Because weight is not always obvious, look for clothes, belts, rings or dentures becoming loose, less interest in food and drink, tiredness, weakness, poor concentration, feeling cold, low mood, and illnesses or wounds that take longer to heal. Adults aged 65 and over are among the groups the NHS says are particularly at risk. Someone can be malnourished even at a healthy weight. If you notice these signs, encourage the person to see their GP, who can check weight and history and may refer to a dietitian.
Why malnutrition in later life is so easy to miss
Malnutrition here means undernutrition: a diet that does not give the body enough of the energy, protein, vitamins and minerals it needs. The NHS calls it a serious condition. The British Dietetic Association (BDA) says around 3 million adults, or 1 in 20, are affected, citing NHS England figures, and that it touches every system in the body.
It slips under the radar for a few reasons. Change happens slowly, so the people who see someone every day are often the last to notice. Older people may play down a smaller appetite, or put it down to age. And the NHS points out that a person can be malnourished at a healthy weight, or even while overweight, if they are not getting enough vitamins and minerals. A rounded face does not rule it out.
Why it matters: the BDA lists tiredness and lethargy, falls, difficulty coughing (which raises the chance of a chest infection), anxiety and depression, and a reduced ability to fight infection among the effects. It also says, plainly, that weight loss is not an inevitable part of ageing. Noticing early gives the GP the best chance to find the cause.
Nine signs carers can see without a set of scales
These come from the NHS symptoms page and the BDA's fact sheet on older people. One on its own may mean little. Several together, or a clear change from how the person usually is, is worth acting on.
Watch for signs of not drinking enough, too. nidirect notes that thirst fades with age, and lists dark urine passed in small amounts, headaches, confusion, irritability and poor concentration as possible signs of dehydration. These can have other causes, so mention them to the GP as well.
Working out whether weight loss is significant
The NHS describes three weight-related signs: losing 5 to 10% of body weight without trying within 3 to 6 months, a body mass index (BMI) under 18.5, or under 20 for some people who are still at risk. NICE guidance for professionals goes further: it treats unintentional loss of more than 10% within 3 to 6 months, a BMI under 18.5, or a BMI under 20 with more than 5% loss in that time as signs that someone is malnourished.
Percentages are hard to do in your head, and weight scales at home vary. If you know roughly what the person weighed a few months ago, the calculator below gives you the percentage to mention to the GP. It is not a test or a diagnosis.
Weight change calculator
Enter an earlier weight and today's weight in the same unit. Nothing is stored or sent anywhere.
Two practical points. Weigh at a similar time of day in similar clothes, and write the number down with the date. And if there are no scales at home, the GP surgery or practice nurse can weigh the person, and a loose belt or ring is a useful clue in itself.
Worried, but not sure what to do next?
Supporting an Older Person With Poor Appetite walks family carers from noticing to acting, in 2 hours at your own pace (£12.99):
- A When-to-see-the-GP checker for the signs on this page
- A Weight check log and a Food and fluid chart
- How to prepare for the GP appointment and what to ask
- Red flags that mean calling 111 or 999
Clues around the home that are worth a second look
Beyond the person themselves, the home often tells the story. None of these proves anything, but each is a reason to look more closely and gently ask how things are going.
- Food going unused. Shopping from last week still unopened, or meals you left untouched.
- Very little fresh food. A fridge with just milk and butter, or a cupboard of only biscuits.
- Hard-to-open packaging set aside. Jars and tins left unopened can point to weak or painful hands.
- Cooking has stopped. Pans not used, or a switch to toast and tea for most meals.
- Avoiding certain foods. Leaving meat, crusts or apples can point to sore teeth or dentures.
- Fewer drinks. The same cup of tea going cold, or cutting down to avoid trips to the toilet.
- Eating alone, every meal. The BDA says eating alone and social isolation can reduce appetite.
- Missed shopping trips. Problems getting out, carrying bags or reaching the shops.
What can sit behind a falling appetite
Spotting the signs is half of it. The other half is the cause, which is the GP's job to find, but knowing the common ones helps you give useful information. These are the causes the NHS lists.
| Type of cause | Examples the NHS gives | What you might notice |
|---|---|---|
| Long-term conditions | Conditions that cause loss of appetite, nausea or bowel changes, such as cancer, liver disease and some lung conditions such as COPD | Feeling sick, not finishing meals, changes in toilet habits |
| Mental health | Depression and other conditions that affect mood and the desire to eat | Withdrawal, low mood, losing interest in things |
| Memory | Dementia, which can mean a person forgets to eat | Meals missed, food left out, unsure whether they have eaten |
| Medicines | Side effects such as nausea, loss of appetite or diarrhoea | Appetite changed after a new medicine or a dose change |
| Mouth and teeth | Poor dental health or dentures that do not fit properly | Choosing soft food, wincing when chewing |
| Getting about | A physical disability or impairment that makes moving, cooking or shopping hard | Shopping not done, cooking given up |
| Social and money | Living alone, social isolation, low income, limited cooking knowledge, alcohol dependency | Very simple meals, an empty fridge, worry about bills |
Swallowing deserves its own mention. The NHS dysphagia page lists coughing or choking when eating or drinking, food feeling stuck, a gurgly wet voice after eating or drinking and difficulty chewing as symptoms, and says that over time swallowing problems can lead to weight loss and repeated chest infections. These need an urgent GP appointment or a call to 111.
Four beliefs that hold families back from getting help
How professionals screen: MUST in plain words
You may hear a nurse or GP mention "MUST". It stands for the Malnutrition Universal Screening Tool, developed by BAPEN, the British Association for Parenteral and Enteral Nutrition. BAPEN describes it as a tool for trained staff to identify adults who are malnourished or at risk. It is not a do-it-yourself test, but knowing what it looks at helps you bring the right information.
| Step | What the professional checks | How it is scored |
|---|---|---|
| 1. BMI | Height and weight, or other measurements if these cannot be taken | 0, 1 or 2 from a BMI chart |
| 2. Unplanned weight loss | How much weight has been lost without trying in the past 3 to 6 months | Under 5% scores 0, 5 to 10% scores 1, over 10% scores 2 |
| 3. Acute illness | Whether an acute illness has meant, or is likely to mean, no food for more than 5 days | Adds 2 if so |
| 4. Overall risk | The three scores added together | 0 low, 1 medium, 2 or more high |
| 5. Plan | A care plan agreed and recorded using the guidelines or local policy | Routine care, observation or nutrition support |
NICE guidance says hospital inpatients should be screened on admission and weekly, outpatients at their first clinic appointment, and people in care homes on admission and whenever there is concern. So if your relative goes into hospital or a care home, it is reasonable to ask whether they have been screened and what the result was.
A two-week record to take to the GP
GP appointments are short. A simple record gives the doctor facts rather than impressions and saves time. The BDA suggests asking gentle questions about what someone has been eating and whether they have lost weight without trying; writing the answers down turns them into evidence.
What to note each day
| Date | Meals and snacks (how much was eaten) | Drinks | Weight, if known | Anything else |
|---|---|---|---|---|
| Mon | Half a bowl of cereal, a few spoons of soup, no evening meal | 3 cups of tea | Not weighed | Tired, said food tastes of nothing |
| Tue | Toast at breakfast, sandwich half eaten | 2 cups of tea, a glass of water | Not weighed | Coughed while drinking |
| Wed | ... | ... | ... | ... |
Bring as well: a list of all medicines, including any from the chemist; any weights you know, with dates; when you first noticed a change; and the questions you want answered. Asking whether a referral to a dietitian would help is entirely reasonable, since the NHS says the GP may refer to one.
A hypothetical family noticing the change
A woman in her late seventies lives alone after her husband died last year. Her son visits on Sundays. Over two months he notices she wears the same thick jumper every visit, the fruit bowl he fills is untouched, and her wedding ring now slides over her knuckle. She says she is "just not bothered about cooking for one".
He writes down what he has seen, checks her weight on her bathroom scales and finds it is well below the figure on her last hospital letter from the spring. Using the calculator, the drop works out at a little over 8%. He books a GP appointment with her agreement, brings his notes and her medicines list, and asks about a dietitian and local lunch clubs.
The point of the example is the order of events: notice, record, talk with her, then involve the GP. It does not say what the GP will find.
Deciding how quickly to act
- coughing or choking when eating or drinking, or food feeling stuck
- a wet, gurgly voice or shortness of breath after eating or drinking
- eating or drinking almost nothing, or signs of dehydration with confusion
- weight loss without trying, especially 5 to 10% or more over 3 to 6 months
- several of the nine signs, or a clear change from normal
- appetite change after a new medicine (ask the pharmacist too)
Raising it without making them feel watched
Many older people are proud of managing on their own, and comments about weight or food can feel like criticism. A few approaches that tend to land better:
- Start with how they feel, not what they weigh. "You seem tired lately, how are you finding things?" opens more doors than "You've lost weight."
- Share a meal. The BDA notes that eating with friends or family can help. Eating together also shows you what is easy and what is not.
- Ask about practical barriers. Teeth, shopping, energy to cook and opening packets are easier to talk about than appetite.
- Make the GP visit about energy or a check-up. Offer to go with them and take notes.
- Respect their choices. The NHS treatment page notes that consent is needed for nutrition support. Your role is to support decisions, not make them.
If caring is starting to take up more of your week, the family caregiving courses cover care plans, sharing tasks between relatives and looking after yourself.
When the GP, NHS 111 or a pharmacist should be involved
- Weight is falling without trying, or clothes, rings or dentures are getting looser: see the GP, who can check weight, height and history and may refer to a dietitian.
- Little or nothing has been eaten for several days, or is likely to be: get advice promptly.
- Coughing or choking with food or drink, or a gurgly voice after drinking: urgent GP appointment or 111.
- Appetite changed after starting or changing a medicine: ask the pharmacist or GP, and do not stop a medicine without advice.
- Low mood, confusion or memory changes alongside eating less: tell the GP about all of these together.
Learn to support them with confidence
Noticing the signs is often where families feel most alone. These self-paced courses give you the checkers, logs and planners to move from worry to a clear plan, at your own pace. They are educational, written by Dr Aqsa Mukhtiar, and do not diagnose or treat any condition. See all healthy ageing courses too.
Supporting an Older Person With Poor Appetite
Spot the signs, keep a weight and fluid record, prepare for the GP and know the red flags that need urgent help.
Supporting an Ageing Parent
Start the hard conversation, request a needs assessment and organise appointments, care options and family roles.
Nutrition for Older Adults
For older people themselves: protein, bones, drinks and a malnutrition risk checker to use at home.
Full refund within 14 days if you have completed less than 20% of the course and no certificate has been issued. Courses are educational and do not treat any condition.
Related guides
- Which course should I take?: find the right course for you or a relative.
- Eatwell Guide explained: what a balanced day of food looks like.
- Healthy ageing courses: staying well, active and independent in later life.
Malnutrition in later life: what families ask
What are the first signs of malnutrition in older people?
The NHS lists unintentional weight loss as the main sign, often noticed as clothes, belts and jewellery becoming looser. Other signs include reduced appetite or interest in food and drink, tiredness, weakness, poor concentration, feeling cold, low mood, and illnesses or wounds that take longer to heal.
How much weight loss is a concern in an elderly person?
The NHS says losing 5 to 10% of body weight without trying within 3 to 6 months is a sign of malnutrition. NICE treats unintentional loss of more than 10% within 3 to 6 months as a sign that someone is malnourished. Any weight loss without trying is worth discussing with a GP.
Can an older person be malnourished if they are not thin?
Yes. The NHS says someone can be malnourished while at a healthy weight or even overweight, for example if they are not getting enough vitamins and minerals.
What is the MUST screening tool?
MUST is the Malnutrition Universal Screening Tool developed by BAPEN. Trained staff use it to score BMI, unplanned weight loss over the past 3 to 6 months and whether acute illness has meant no food for more than 5 days, giving a low, medium or high risk result and a care plan.
What causes malnutrition in older people?
The NHS lists long-term conditions that reduce appetite, depression, dementia, side effects of medicines, poor dental health or dentures that do not fit, physical difficulties with shopping or cooking, living alone, low income and alcohol dependency among the causes.
When should I take my elderly parent to the GP about not eating?
Book a GP appointment if they are losing weight without trying, have several signs of malnutrition, or their appetite changed after a new medicine. Get urgent advice from the GP or NHS 111 for coughing or choking when eating, or if they are eating or drinking almost nothing.
How can I bring up eating and weight with a parent without upsetting them?
Start with how they are feeling rather than their weight, share a meal, ask about practical barriers such as teeth, shopping or cooking, and offer to go with them to a GP appointment. Respect their choices, as consent is needed for any nutrition support. You can browse every course and guide on the My Nutri Care home page.
Sources
Show all 9 official sources
- NHS: Malnutrition (last reviewed 23 May 2023)
- NHS: Symptoms of malnutrition (last reviewed 23 May 2023)
- NHS: Causes of malnutrition (last reviewed 23 May 2023)
- NHS: Treatment for malnutrition (last reviewed 23 May 2023)
- NHS: Swallowing problems (dysphagia) (last reviewed 26 October 2026)
- NICE CG32: Nutrition support for adults, key priorities for implementation
- BAPEN: The MUST explanatory booklet
- British Dietetic Association: Malnutrition in older people (7 October 2020)
- nidirect: Healthy eating for older adults (last modified 5 February 2026)
This article is general information for families and carers, based on NHS, NICE, BAPEN and BDA guidance. It cannot tell you whether someone is malnourished and is not a diagnosis. If you are worried about an older person's eating, drinking or weight, speak to their GP, pharmacist or a registered dietitian, call NHS 111 for urgent advice, or 999 in an emergency.
