Loss of appetite: causes, medications & when you should act

Breakfast is left standing, lunch is only half eaten and in the evening the hunger is missing completely. Everyone knows temporary loss of appetite – with stress, heat or an infection it is normal. But when the appetite stays away for weeks and you lose weight unintentionally, you should take a closer look. Particularly often overlooked: many medications dampen the appetite as a side effect.

What you can do right now
When does it become problematic?
Common causes
Stimulating appetite – what helps?
Is it down to your medication?
Warning signs: when to see a doctor?
Preparing for the doctor's appointment
How brite supports you
FAQ

With unwanted weight loss of more than 5 % in 6 months or persistent vomiting, have it assessed by a doctor promptly.

1. What you can do right now

Quick help with loss of appetite

Small portions: rather 5–6 small meals than 3 large ones – small portions overwhelm the stomach less.
Favourite foods: eat what you fancy – every calorie counts when the appetite is missing.
Drinks: drink between meals, not with them – fluid fills the stomach and suppresses the appetite.
Movement: a short walk in the fresh air stimulates the appetite.
Check medications: are you taking metformin, semaglutide, iron preparations or citalopram? They can suppress the appetite.

2. Understanding loss of appetite – when does it become problematic?

Loss of appetite (medically inappetence) means that the natural feeling of hunger stays away or is greatly reduced. In the short term this is harmless – with infections, stress or heat the body regulates the appetite down.

5 % weight loss in 6 months – a warning sign! It becomes problematic when loss of appetite leads to unwanted weight loss of over 5 % in 6 months. Especially in older people, the downward spiral of less eating → less strength → less movement → even less appetite can become life-threatening.

3. Common causes of loss of appetite

3.1 Medications – more common than thought

Medication	Why it suppresses the appetite	What helps
Metformin	Nausea and loss of appetite especially in the first weeks – the most common side effect	Take with food, titrate up slowly
Semaglutide (Ozempic/Wegovy)	Dampens the feeling of hunger specifically via GLP-1 receptors in the brain – can turn out too strong	If the appetite suppression is too strong: adjust the dose
Iron preparations	Nausea and stomach complaints suppress the appetite	Take with orange juice, not on an empty stomach
Citalopram, escitalopram	Appetite suppression especially in the first weeks	Usually normalises after 2–4 weeks
Chemotherapy agents	Severe loss of appetite as a common side effect	Discuss supportive therapy with the oncologist

Table scrollable to the right

3.2 Gastrointestinal diseases

Gastritis, stomach ulcers, irritable bowel syndrome or food intolerances can dampen the appetite. Heartburn and bloating too make eating unpleasant.

3.3 Psychological strains

Depression, anxiety disorders, grief and chronic stress are common causes. Loss of appetite is one of the diagnostic criteria for major depression – it often goes together with tiredness, sleep disorders and a lack of drive.

3.4 Infections and fever

With acute infections (a cold, flu, a gastrointestinal infection) loss of appetite is normal and disappears with recovery once the fever subsides.

3.5 Old age

In old age the feeling of hunger and thirst declines. At the same time the number of medications rises – a double risk of malnutrition. Check the combination in the interaction check.

4. Stimulating appetite – what helps with a missing hunger

Nutrition tips

Five to six small meals a day instead of three large ones. Prioritise what you fancy – every calorie counts. Keep nutrient-rich snacks at hand (nuts, avocado, cheese, yoghurt). Smoothies and soups are good alternatives when solid food is difficult. Bitter substances can stimulate the appetite: gentian, artichoke, wormwood or dandelion as a tea or drops.

Lifestyle

A short walk before eating stimulates the appetite. Eating together – social meals demonstrably increase food intake. Drink between meals, not with them.

With a medication cause

Metformin: taking it with food (not on an empty stomach) and a slow dose increase reduce the nausea considerably. Iron preparations: take with orange juice (vitamin C promotes absorption). With persistent loss of appetite: speak to a doctor, discuss an alternative preparation if needed. Never stop on your own.

5. Is it down to your medication?

Digital medication plan: did the loss of appetite begin with a new medication? → Create a medication plan

Interaction check: several appetite-suppressing active ingredients at once? brite shows the combination. → Start the interaction check

Intake reminder: take metformin with food – the reminder helps to keep to the right time. → Set up a reminder

6. When should you have loss of appetite assessed?

Unwanted weight loss of more than 5 % in 6 months.
The loss of appetite lasts longer than 2 weeks.
Accompanying symptoms such as fever, night sweats or severe abdominal pain.
Difficulty swallowing or persistent vomiting.
A new medication shortly before the complaints began.

7. Preparing for the doctor's appointment – your checklist

Since when? When did the appetite decline?
Weight loss? How many kg in what period?
Medications: a complete list – over-the-counter remedies too.
Accompanying symptoms: nausea, pain, tiredness, mood changes?
Mental state: stress, grief, low mood?

How brite supports you in keeping an overview

brite helps you to recognise appetite-suppressing medications and to keep to the right intake time.

Digital medication plan – shows immediately whether a new medication is connected in time with the loss of appetite. To the medication plan
Interaction check – recognises when several appetite-suppressing active ingredients are combined. Check now
Intake reminder – taking metformin with food reduces nausea considerably. Set up a reminder

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