Satiety · Article
Loss of Appetite: Common Causes and How to Eat Well When You're Not Hungry
Why appetite drops (illness, stress, medicines like GLP-1 drugs, aging or pregnancy), which warning signs mean seeing a doctor, and how to eat well when you're not hungry.
- Written by
- Alex Gonzalez
- Last updated
- Next review
- Sources
- 14 primary and 2 supporting
No clinical review. No advertising from drug companies and no affiliate links.How we work
Loss of appetite usually has a passing cause: an infection, a rough stretch, a new medicine. According to MedlinePlus, any illness can reduce appetite, and if the illness is treatable, appetite should come back once it’s cured[1]. When it lingers, it’s worth looking further: sadness or depression, chronic illness, aging or pregnancy. On drugs like Wegovy or Zepbound, eating less is the intended effect1516. Whatever the cause, the challenge is the same: making the little you eat give you what you need.
In 30 seconds
- MedlinePlus defines unintentional weight loss as losing 10 pounds (4.5 kg) or 5% of your normal body weight over 6 to 12 months or less without knowing why[2]. That’s a reason to see your doctor.
- With age, appetite drops because of changes in taste, smell, hormones and how the stomach fills and empties, but a 2016 review stresses that it isn’t inevitable[12].
- What comes up again and again in the sources: small, frequent meals, protein first, and drinks that contain protein.
- On GLP-1 medications, a 2025 advisory from four US societies reports that people eat 16% to 39% less than on placebo[14].
- If not feeling hungry is a relief and you want to eat as little as possible, or eating frightens you, talk to a professional.
I explain how hunger and fullness signals work in the science of satiety. Here I focus on what can take your appetite away and how to eat well when you don’t have one.
Common causes of loss of appetite
| Cause | What usually happens | Source |
|---|---|---|
| A short-term illness | Appetite drops while it lasts and comes back once you recover | MedlinePlus[1] |
| Acute stress | Right afterward, a brain hormone puts the brakes on appetite; hours later, appetite can rise | Sominsky and Spencer (2014)[13] |
| Sadness, grief or depression | Sudden change in appetite, often with weight loss or gain | MedlinePlus[7] |
| Medicines | Antibiotics, chemotherapy, codeine and morphine, among others; GLP-1 drugs lower it by design | MedlinePlus and the FDA labels11516 |
| Older age | Less taste and smell, feeling full sooner, loneliness, trouble chewing | Landi and colleagues (2016) and NIA912 |
| Pregnancy | Common in the first trimester, often with nausea | MedlinePlus and ACOG110 |
| Chronic illness | Liver, kidney or lung disease (COPD), heart failure, underactive thyroid, dementia, HIV, some cancers | MedlinePlus[1] |
| Street drugs | Amphetamines, cocaine and heroin | MedlinePlus[1] |
A note on words: according to MedlinePlus, the medical term for loss of appetite is “anorexia.”[1] That’s not the same as anorexia nervosa, an eating disorder I cover further down.
A short-term illness
The flu, a stomach bug or a urinary tract infection can take away your appetite for a few days. The MedlinePlus page on decreased appetite sums it up: any illness can reduce appetite[1]. On those days, keep an eye on fluids above all: not feeling like eating or drinking because you’re sick is one of the causes of dehydration MedlinePlus lists[6]. You can find a general daily water reference in the hydration calculator.
Stress, sadness and depression
Stress can shut your appetite down in an instant. According to a 2014 review, right after a stressful event, corticotropin-releasing hormone (CRH), which is made in the brain, curbs food intake. Over the following hours, cortisol and other glucocorticoids stimulate it[13]. That’s why stress takes some people’s appetite away and makes others hungry; I explain it in sleep, stress and appetite.
Sadness, grief and depression can take your appetite too. MedlinePlus lists a sudden change in appetite, often with weight gain or loss, among the symptoms of depression[7]. If loss of appetite comes with other signs of depression, MedlinePlus advises seeking medical help[1].
Medicines
Several medicines reduce appetite. MedlinePlus names antibiotics, chemotherapy medicines, codeine and morphine[1]. In older adults, who often take several at once, the Landi review adds heart medicines such as digoxin, amiodarone and spironolactone, and some psychiatric drugs, such as lithium or fluoxetine[12].
If you suspect a medicine is taking away your hunger, bring it up with your doctor. MedlinePlus is clear: don’t stop taking any medicine without talking to your provider first[1]. GLP-1 medications are a separate case, and I cover them in their own section.
With age: anorexia of aging
“Anorexia of aging” is the loss of appetite or food intake in older age. According to the review by Landi and colleagues, it’s very common, contributes to undernutrition and independently predicts more illness and death[12]. Its mechanisms add up[12]:
- Taste and smell. Both fade with age, at different rates. Salty and sweet tastes are often the first to go, and food loses its appeal[12]. The National Institute on Aging adds that dental problems and medication side effects can change these senses too[9].
- Hormones. Older adults seem to respond less to ghrelin, the hormone that drives hunger. There are also changes in CCK, one of the signals that bring a meal to an end.
- Stomach. The stomach stretches less easily as it fills, which can make you feel full sooner. Slower emptying makes the feeling of fullness last longer.
- Mouth. Missing teeth or poorly fitting dentures make chewing harder. That’s linked to eating less fiber, calcium and protein.
- Surroundings. Economic inequality and isolation weigh in: living alone is linked to less appetite and lower intake.
The authors insist that anorexia isn’t an unavoidable consequence of aging[12]. The NHS puts it another way: people aged 65 and over are particularly at risk of malnutrition, but weight loss isn’t an inevitable result of old age[11].
Pregnancy
MedlinePlus includes the first trimester of pregnancy among the causes of decreased appetite[1]. It often comes with nausea. According to ACOG, nausea and vomiting of pregnancy is common, usually starts before 9 weeks, and for most women goes away by 14 weeks. Its suggestions include five or six “mini meals” a day so your stomach is never empty, bland, low-fat foods, some protein at each meal, and drinking throughout the day[10].
There is a severe form, hyperemesis gravidarum, which ACOG says occurs in up to 3% of pregnancies and can lead to weight loss and dehydration[10]. The signs that mean calling are in the box below.
When to see a doctor
When to call your doctor
- You’re losing weight without trying. More than 10 pounds (4.5 kg) or 5% of your normal body weight over 6 to 12 months or less, with no explanation, or along with other symptoms (MedlinePlus)[2]. For the NHS, losing 5% to 10% or more of your weight over 3 to 6 months is one of the main signs of malnutrition[11].
- Loss of appetite comes with abdominal pain. MedlinePlus says to contact your provider if you have a prolonged poor appetite, a fever over 100°F (37.7°C) with the pain, unexplained weight loss, or you can’t keep down any food or liquids[3]. Sudden, sharp abdominal pain means getting medical help right away or calling 911[3].
- Swallowing is hard. Contact your provider if it doesn’t improve after a few days or keeps coming and going. Call right away if you have a fever or shortness of breath, are losing weight, cough or vomit up blood, or feel as if you’re choking during or after eating (MedlinePlus)[4].
- You fill up almost at once. Early satiety is worth a visit if it lasts days to weeks and doesn’t get better, or if you lose weight without trying, have dark stools, nausea and vomiting, abdominal pain or bloating, or fever and chills (MedlinePlus)[5].
- Sadness, alcohol, drugs or a new medicine may be behind it. MedlinePlus says to seek medical help in those cases[1]. If you’re thinking about harming yourself, call or text the 988 Suicide and Crisis Lifeline, any time (MedlinePlus)[7].
- You’re pregnant and vomiting, and you pass only a little dark urine or can’t urinate, can’t keep liquids down, feel dizzy or faint when you stand up, or have a racing or pounding heartbeat (ACOG)[10]. ACOG adds that abdominal pain, fever, headache, or nausea and vomiting that start for the first time after 9 weeks can point to another cause, and that losing weight makes it more of a problem[10].
To prepare for the visit, MedlinePlus suggests keeping a record of what you eat and drink for 24 hours or more[1]. You can do it alongside your symptoms in the symptom diary and write down your questions with the doctor-visit checklist.
How to eat well when you’re not hungry
The idea isn’t to force yourself to eat a lot, but to make what you do eat count. Here’s what the sources suggest, from most to least backing:
| If this happens | Try this | Source |
|---|---|---|
| A normal plate looks like too much | Several small meals and snacks through the day | MedlinePlus, NHS and the 2025 advisory11114 |
| You’re full after a few bites | Start with the protein part of the plate | 2025 advisory[14] |
| Solid food won’t go down | Smoothies or shakes with milk or yogurt, soups, cottage cheese | MedlinePlus and the 2025 advisory114 |
| Fat or fiber sits heavy | At that meal, dishes with less fat and less fiber | MedlinePlus (early satiety)[5] |
| Hours go by without eating | An alarm or reminder to eat | 2025 advisory[14] |
| Nothing appeals | Your favorite foods, more flavor and some company | MedlinePlus, NIA and Landi (2016)1912 |
Small, frequent meals
For people losing weight because of an illness, MedlinePlus advises raising protein and calorie intake with high-calorie, nutritious snacks or several small meals a day[1]. For malnutrition, the NHS suggests snacking between meals, eating foods fortified with extra calories and protein, and having drinks that contain plenty of calories[11]. The 2025 advisory on nutrition and GLP-1 medications adds that small, frequent meals may work when hunger and interest in food are low[14].
Some ideas to keep on hand:
- Breakfasts: 12 high-protein breakfasts for days when you have no appetite, with 12 to 28 g of protein each.
- Snacks: 25 snacks with protein or fiber, from 86 to 185 calories.
- Cooking ahead: batch cooking with a small appetite, so you don’t have to decide every day.
Protein first
According to the 2025 advisory, a low appetite or aversion to certain tastes can make it hard to get enough protein, and it suggests eating protein-rich foods first in a meal. It considers protein a priority for preserving muscle and bone[14]. What’s known about taste changes on these drugs is in food tastes different on GLP-1s. For older adults, the Landi review cites the PROT-AGE Study Group reference: at least 1.0 to 1.2 g of protein per kilogram of body weight a day (about 0.45 to 0.54 g per pound) to reduce the loss of muscle mass and strength[12].
How much you need depends on your weight, age and activity. You can estimate it with the protein calculator and find options in the ranking of high-protein foods.
Drinks that nourish
MedlinePlus notes that liquid protein drinks can help[1]. The 2025 advisory mentions smoothies and protein drinks made with fruit, vegetables and unsweetened milks or yogurt, plus cottage cheese and soups, which many people find more appealing than heavier foods such as red meat, cold cuts or hard cheeses[14].
There are 10 high-protein shakes without protein powder, with about 9 to 21 g of protein each. Nutritional supplement drinks are a different matter: the NHS says supplements should only be taken on the advice of a healthcare professional[11].
Easy-to-digest meals
If you fill up fast, MedlinePlus notes that a diet high in fat or fiber may make the feeling worse[5]. That doesn’t mean cutting fiber for good, but choosing softer textures for the meals that are hardest to get through. There are recipes in the easy-to-digest recipes collection and foods in the ranking of easy-to-digest foods. If nausea is part of it, I go into detail in nausea on GLP-1 medications: what to eat.
Flavor, variety and company
MedlinePlus suggests that family members offer the person their favorite foods[1]. The National Institute on Aging suggests boosting flavor with lemon juice, vinegar or herbs rather than extra salt, varying the shape, color and texture of foods, and sharing meals, for example at a senior center or a potluck[9]. For older adults, the Landi review proposes improving texture and flavor, adding variety and helping people eat when needed. It also recommends preventing isolation and encouraging shared meals[12].
Loss of appetite on Ozempic, Wegovy or Zepbound
What to expect
With these medications, eating less isn’t a side effect but how they work. Semaglutide is the active ingredient in Ozempic and Wegovy; tirzepatide, in Zepbound and Mounjaro.
- Wegovy (semaglutide). Its US label states that semaglutide decreases calorie intake, and the effects are likely mediated by affecting appetite[15].
- Zepbound (tirzepatide). Its US label says the same of tirzepatide: it decreases calorie intake, and the effects are likely mediated by affecting appetite. It adds that GLP-1 is a physiological regulator of appetite and caloric intake, and that both GIP and GLP-1 receptors are found in areas of the brain involved in appetite regulation[16].
- Not listed as a side effect. Neither US label lists decreased appetite among its adverse reactions; both describe it under how the drug works1516.
- Filling up sooner. MedlinePlus lists these medicines among the causes of early satiety[5].
The 2025 advisory puts a number on it: people eat 16% to 39% less than on placebo[14]. It also flags two risks. With so little interest in food, some people go several hours without eating and don’t get the nutrients they need. And below about 1,200 calories a day for women or 1,800 for men, the risk of falling short on vitamins and minerals goes up[14].
How to organize your eating at each stage of treatment is in what to eat on GLP-1 medications, and how to protect your muscle, in protein and muscle on GLP-1 medications.
When it’s not what you’d expect
When to call your doctor if you take a GLP-1 medication
- Severe stomach pain that won’t go away. The Wegovy and Zepbound Medication Guides describe the possible sign of pancreatitis (inflammation of the pancreas) this way: severe pain in your stomach area (abdomen) that will not go away, with or without nausea or vomiting; sometimes you may feel the pain from your abdomen to your back. They say to call your healthcare provider right away1516.
- You can’t keep fluids down. Nausea, vomiting and diarrhea can dehydrate you. Both US labels carry a warning on acute kidney injury due to volume depletion (section 5.5 for Wegovy, 5.3 for Zepbound): there have been postmarketing reports of acute kidney injury, in some cases requiring hemodialysis, and most occurred in patients whose nausea, vomiting or diarrhea led to dehydration1516. The signs are in hydration on GLP-1 medications.
- Signs that something is missing. The 2025 advisory lists fatigue beyond what you’d expect, excessive hair loss, flaky or itchy skin, muscle weakness, poor wound healing and unusual bruising[14].
- You’re pregnant or trying to be. The US labels state that weight loss offers no benefit to a pregnant patient and may cause fetal harm1516. The Wegovy label says to discontinue it at least 2 months before a planned pregnancy because of semaglutide’s long half-life[15], and the Zepbound label, to discontinue it when a pregnancy is recognized[16]. Talk it through with your doctor.
If your appetite drops so much that you can’t eat what you need, bring it up with your doctor. Any change to your treatment is up to your prescriber.
Loss of appetite and eating disorders
Not feeling hungry isn’t the same as forcing yourself not to eat. In anorexia nervosa, according to MedlinePlus, people avoid food, severely restrict it or eat very small amounts of only certain foods, and may see themselves as overweight even when they’re dangerously underweight[8]. It’s the least common of the three most common eating disorders, but it’s often the most serious[8].
Some signs worth pausing on: your lack of appetite feels like a relief and you want to keep it, you skip meals to make up for eating, or eating makes you feel afraid or guilty. The 2025 advisory recommends screening for eating disorders before starting a GLP-1 medication[14]. If you recognize yourself in any of this, talk to your doctor: eating disorders are serious mental health conditions, and there are treatments that help[8].
Frequently asked questions
Why am I not hungry?
Most often it’s something temporary: an infection, stress or a new medicine. If it lasts for weeks, you’re losing weight without trying or you have other symptoms, see your doctor to find the cause.
What can I eat when I have no appetite?
Small, frequent meals, starting with the protein, and drinks that nourish, such as smoothies with milk or yogurt, and soups. Choose what appeals to you and sits well, with softer textures if you fill up fast.
When is loss of appetite a concern?
When you lose more than 10 pounds (4.5 kg) or 5% of your body weight over 6 to 12 months without an explanation[2], or when it comes with pain, fever, trouble swallowing, vomiting that won’t stop or lasting sadness. In those cases, see your doctor.
Can anxiety make you lose your appetite?
It can. Right after a stressful event, a brain hormone curbs appetite; hours later, cortisol can increase it[13]. That’s why stress takes away some people’s appetite and makes others hungry.
Is it normal not to be hungry on Ozempic or Zepbound?
Yes, it’s part of how they work: the US labels say these drugs decrease calorie intake, likely by affecting appetite1516. What isn’t normal is being unable to keep fluids down, severe stomach pain, or signs that you’re short on nutrients. If that happens, call your doctor.
Are there vitamins or pills to boost appetite?
I don’t recommend any. For older adults, the Landi review notes that several medicines have been tested to stimulate appetite, but none is recommended in routine practice[12]. If you’re worried about eating too little, talk to your doctor before taking anything.
Why do older people eat less?
Because of several changes adding up: less taste and smell, feeling full sooner, trouble chewing, medicines and loneliness. It isn’t inevitable1112 and it can be managed, so it’s worth bringing up with a doctor.
Sources
Sources consulted for this article, with the access date.
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Appetite - decreased (Medical Encyclopedia, reviewed July 23, 2024).accessed .
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Weight loss - unintentional (Medical Encyclopedia, reviewed January 1, 2025).accessed .
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Abdominal pain (Medical Encyclopedia, reviewed January 13, 2026).accessed .
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Swallowing difficulty (Medical Encyclopedia, reviewed July 22, 2025).accessed .
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Satiety - early (Medical Encyclopedia, reviewed July 22, 2025).accessed .
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Dehydration (Medical Encyclopedia, reviewed July 1, 2025).accessed .
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Depression (Medical Encyclopedia, reviewed April 19, 2025).accessed .
- InstitutionMedlinePlus, US National Library of Medicine (NIH).Eating Disorders.accessed .
- InstitutionNational Institute on Aging (NIH).Overcoming Roadblocks to Healthy Eating (content reviewed April 7, 2022).accessed .
- InstitutionAmerican College of Obstetricians and Gynecologists (ACOG).Morning Sickness: Nausea and Vomiting of Pregnancy (FAQ126, last reviewed November 2025).accessed .
- InstitutionNHS (UK National Health Service).Malnutrition: overview and treatment (page last reviewed May 23, 2023).accessed .
- Other sourceNutrients (MDPI).Landi F, Calvani R, Tosato M, et al. Anorexia of Aging: Risk Factors, Consequences, and Potential Treatments. Nutrients. 2016;8(2):69. doi:10.3390/nu8020069.accessed .
- Other sourceFrontiers in Psychology.Sominsky L, Spencer SJ. Eating behavior and stress: a pathway to obesity. Front Psychol. 2014;5:434. doi:10.3389/fpsyg.2014.00434.accessed .
- Clinical guidelineObesity (The Obesity Society, Wiley).Mozaffarian D, et al. Nutritional priorities to support GLP-1 therapy for obesity: A joint Advisory from ACLM, ASN, OMA and The Obesity Society. Obesity. 2025;33(8):1475-1503. doi:10.1002/oby.24336.accessed .
- Drug labelU.S. Food and Drug Administration label, via DailyMed (National Library of Medicine).Wegovy (semaglutide) injection and tablets: US Prescribing Information and Medication Guide (sections 5.5, 8.1, 8.3, 12.1 and 12.2), revised 6/2026.accessed .
- Drug labelU.S. Food and Drug Administration label, via DailyMed (National Library of Medicine).Zepbound (tirzepatide) injection: US Prescribing Information and Medication Guide (sections 5.3, 8.1, 12.1 and 12.2), revised 8/2026.accessed .