Appetite Stimulants

Overview

Appetite stimulants are medicines or planned eating strategies used to help someone feel more like eating when poor appetite is causing unplanned weight loss or poor nutrition. They are not a quick fix for healthy people who want to gain weight. Most of the time, the first step is finding and treating the reason appetite dropped — such as an illness, a medicine side effect, low mood, pain, or a swallowing or dental problem — and then using food-based support alongside any medicine your healthcare team recommends.

Poor appetite and unplanned weight loss are very common. They affect up to a third of people in hospital and many people living with long-term illness at home. Because appetite problems are so common, appetite-support medicines are used in general practice, hospital wards, and specialist care, though usually as one part of a wider plan.

Appetite problems and the use of appetite stimulants are most often seen in older adults, people living with cancer or long-term heart, lung, kidney or liver disease, people with dementia, people recovering from surgery or serious infection, and people with depression, anxiety or long-standing pain. Children with poor growth, and people with eating or swallowing difficulties, may also need support. Anyone can be affected at some point, especially during illness or after a big life change such as bereavement or living alone.

Symptoms

Common symptoms

• Little or no interest in food, or food feeling unappealing
• Feeling full very quickly, or feeling full long after a small meal
• Skipping meals or eating much less than usual
• Unplanned weight loss, or clothes and rings feeling loose
• Tiredness, low energy and feeling weak
• Food tasting different, bland or metallic
• Nausea, a heavy feeling in the stomach, or early fullness
• Taking much longer to finish a meal, or needing to rest mid-meal
• Low mood, or mealtimes feeling like a chore or a source of stress

Symptoms in children

• Weight not going up, or weight going down, on the growth chart
• Slower growth in height over time
• Refusing food, holding food in the mouth, or very slow eating
• Being very selective about foods, or distress at mealtimes
• Fewer wet nappies, or fewer trips to the toilet than usual
• Being more tired, more clingy, or less playful than usual

Symptoms in older adults

• Losing weight without trying, sometimes noticed first in looser clothes or dentures that no longer fit
• Losing muscle, feeling weaker, or finding it harder to get up from a chair
• Confusion or drowsiness, which can be a sign of not drinking or eating enough
• Dry mouth, poor-fitting dentures, or tooth pain making eating uncomfortable
• Eating less because of loneliness, low mood, or difficulty shopping and cooking
• Feeling cold, dizzy on standing, or more prone to falls

Causes

Main causes

• An underlying illness such as cancer, long-term heart, lung, kidney or liver disease, or an infection
• Side effects of medicines, including some painkillers, antidepressants and heart medicines
• Low mood, depression, anxiety, grief, or loneliness
• Pain, nausea, constipation, or a bloated stomach
• Dental problems, a dry mouth, or poorly fitting dentures
• Swallowing difficulties or a sore mouth or throat
• Changes in taste and smell, which are common with illness and with ageing
• Dementia or confusion, which can mean meals are forgotten or not recognised
• Practical problems such as difficulty shopping, cooking, or holding cutlery
• Alcohol use, smoking, or a very restricted diet

Risk factors

• Being older, especially living alone or with limited income
• Having a long-term physical or mental health condition
• Taking several medicines at once
• Recent surgery, hospital stay, or serious infection
• Difficulties with chewing, swallowing or dentures
• Depression, bereavement or social isolation
• Frailty, limited mobility, or needing help with daily tasks
• Poverty or difficulty affording or accessing food

When to see a doctor

See a doctor urgently if:

• You or someone you care for has lost weight quickly, or clothes and jewellery have become noticeably loose
• Food or drink is going down the wrong way, or swallowing has become difficult
• Vomiting or diarrhoea that will not settle, or signs of dehydration
• A new lump, bleeding, or pain that is getting worse
• Appetite loss that comes on suddenly with confusion, fever, or feeling very unwell

Book a routine appointment if:

• Appetite has been poor for more than a few weeks, or is affecting daily life
• Mealtimes feel stressful, or eating has become a struggle
• You have started a new medicine and noticed your appetite has changed
• You are worried about a child's eating or growth
• You feel low in mood, or food has stopped being enjoyable
• You would like advice on whether nutritional drinks or appetite-support medicines might help

Diagnosis

There is no single test for poor appetite. Your healthcare professional will usually start by asking about your eating, weight history, mood, medicines and symptoms, and will look for the underlying cause. They may weigh you, check your height to work out your body mass index, and ask you to keep a simple food diary for a few days. A short screening questionnaire is often used to spot people at risk of malnutrition. If an appetite-support medicine is being considered, they will want to know what else has been tried and whether the benefits are likely to outweigh the side effects.

Tests that may be done

• Weight and weight trend over recent weeks or months, plus body mass index
• A malnutrition screening questionnaire — a short set of questions about weight loss, eating and illness
• Blood tests to look for anaemia, infection, thyroid problems, kidney or liver changes, and vitamin levels
• A review of all your medicines, including ones bought over the counter
• A mouth and dental check
• A swallowing assessment if food or drink is going down the wrong way
• Stool or urine tests if there are gut or bladder symptoms
• Scans or camera tests, if the history or blood tests suggest an underlying condition
• A mood and memory check where depression or dementia might be part of the picture

What to expect at your appointment

Expect a conversation rather than a quick prescription. Your clinician will want to understand the whole picture, which may mean more than one appointment and a referral to a dietitian. They will usually explain that treating the cause and improving nutrition come first, and that any appetite-support medicine is a trial with a clear plan for reviewing it — often with a weight check after a few weeks to see whether it is helping. Ask questions, and bring a list of your medicines and any recent weights if you can.

Treatment

Treatment for poor appetite starts with the cause. That might mean changing a medicine that is dulling appetite, treating pain or nausea, fixing a dental problem, lifting low mood, or helping with shopping and cooking. Alongside that, food-based support comes first: small, frequent, energy-rich meals and drinks, and a dietitian's advice if needed. Appetite-support medicines are considered in selected cases, usually by a doctor with experience in this area, and usually as a time-limited trial alongside good nutrition rather than instead of it.

Self-care at home

• Eat by the clock rather than waiting to feel hungry — small amounts every two to three hours
• Choose small, energy-rich portions: add milk, cheese, olive oil, butter, cream, nut butter or mashed avocado to everyday foods
• Have drinks between meals rather than just before, so you do not fill up on liquid
• Keep foods you enjoy within easy reach, and accept help with shopping and cooking
• Try cold or room-temperature foods if smells put you off, and keep the kitchen well ventilated
• Look after your mouth: brush gently, rinse with water, and see a dentist if dentures rub or teeth hurt
• Ask about nutritional drinks and powders from your pharmacist or dietitian — these are food products, not medicines
• Gentle movement such as a short walk before a meal can help appetite
• Eat with others when you can — company often makes food more appealing

Medical treatments

Appetite-support medicines work in different ways — some affect hormones or signals in the body that control hunger, and others ease nausea, improve mood, or help food move through the gut more comfortably. Because they can cause side effects and do not suit everyone, they are usually prescribed only after the underlying cause has been reviewed and food-based support has been tried. When they are used, they are often started as a short trial, with a clear plan to check appetite, weight, and side effects after a few weeks. If there is no benefit, or side effects are troublesome, they are usually stopped. Your clinician will also review whether any of your existing medicines could be reducing appetite. Never start, stop, or change any medicine on your own — always talk to your doctor or pharmacist first.

When is surgery considered?

Surgery is not a treatment for poor appetite itself. However, sometimes appetite is affected by a problem that needs a procedure — for example a dental problem, a narrowing in the gut, or a painful hernia. If your clinician suspects something like this, they will explain the options and what recovery might mean for eating afterwards.

Living with this condition

Living with a small appetite is easier when meals are low-effort and low-pressure. Keep a simple routine, put the biggest meal at the time of day when you feel best — often breakfast or lunch — and treat snacks as equal partners to meals rather than extras. Keep a note of your weight every couple of weeks, or ask your nurse or pharmacist to weigh you. Tell your family or carers what helps and what does not; well-meant pressure to 'eat up' often makes things harder, while gentle, practical help works better.

Lifestyle tips

• Keep a regular daily rhythm, with meals and snacks at similar times
• Build in rest before meals so you are not too tired to eat
• Ask for help with shopping, cooking, or preparation — this is practical support, not a burden
• Reduce strong cooking smells and keep the room where you eat calm and pleasant
• Limit alcohol, which can replace food and affect appetite and mood
• If you smoke, ask for support to stop — it affects taste and appetite
• Keep up dental check-ups and mention any denture or mouth pain early

Diet and exercise

There is no single 'best' diet for a small appetite, but energy-rich, easy-to-eat food helps most people. Aim for small portions of foods you enjoy, and add extra nourishment to them where you can — full-fat milk, cheese, yoghurt, eggs, beans, nut butters, and healthy oils all add energy without adding much bulk. Protein matters for keeping muscle, so try to include some at each eating occasion. Gentle activity — a short walk, chair-based exercises, or a few minutes in the garden — can support appetite and muscle strength, but rest is just as important. If you have a long-term condition affecting your heart, kidneys or blood sugar, ask your dietitian or doctor about tailoring this advice to you.

Mental health and emotional wellbeing

Losing your appetite can be worrying and isolating, and it often goes hand in hand with low mood, anxiety, or grief. Feeling pressured at mealtimes can make things worse. It is completely understandable to find this hard, and support is available. Talk to your doctor or nurse about how you are feeling — mood and appetite are closely linked, and treating one often helps the other. If you feel hopeless, or have thoughts of harming yourself, please contact your local emergency number or a crisis line in your country straight away, or reach out to someone you trust and ask them to stay with you while you get help.

Prevention

Not all appetite loss can be prevented, especially when it comes with a serious illness. But some of the harm it causes can be reduced by catching it early. Weighing yourself or being weighed regularly, mentioning appetite changes early, getting medicines reviewed when you start something new, treating pain and low mood, and keeping up with dental care are all practical steps. If you know a period of poor eating is likely — for example around surgery or during treatment for a long-term condition — ask in advance for dietitian support rather than waiting until weight has already dropped.

Screening programmes

Many healthcare settings use a short malnutrition screening questionnaire at appointments, on hospital admission, and sometimes in care homes. It asks about recent weight loss, how much you have been eating, and whether you are acutely unwell. If the score suggests a risk, a fuller assessment and dietitian referral usually follow. Ask your GP surgery or practice nurse if a nutrition check is part of your routine care, particularly if you live with a long-term condition.

Complications

If left untreated

• Malnutrition — not getting enough energy, protein and nutrients to keep the body working well
• Loss of muscle, leading to weakness, slower walking, and a higher risk of falls
• Slower recovery from illness, infection or surgery, and wounds healing more slowly
• A weaker immune system, so infections are more likely or last longer
• Low mood, poor concentration, and reduced quality of life
• Problems with vitamins and minerals, which can affect the nerves, bones and blood
• More frequent hospital stays for people living with long-term conditions

Long-term outlook

For most people, appetite improves once the cause is found and treated, and small, steady gains in weight and strength make a real difference. Appetite-support medicines can help some people, and even a modest improvement in eating can support recovery and everyday energy. Progress is often gradual rather than dramatic, and setbacks are normal — they are not a sign of failure. With the right support from your healthcare team, family and friends, there is good reason to feel hopeful.

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