GLP-1 side effects, tracked and explained.
The most common GLP-1 side effects on Ozempic, Wegovy, Mounjaro and Zepbound, and what the research actually says to do about each one.
Every GLP-1 has the same family of side effects: nausea, fatigue, constipation, occasional vomiting, headache, and a few rarer but important ones. They are mostly predictable. They mostly improve. A small number are emergencies worth recognising the first time, not the fifth.
the foodose research library is a clear, evidence-based account of what works for each one, and the calculator turns this week's symptoms into a plan that accounts for them. The combination is the difference between a vague memory of a bad month and knowing which lever to pull on a bad Tuesday.
Below: a short list of the side effects worth knowing about, with a full explainer for each. Every article cites the registration trials, the FDA labels, and peer-reviewed sources. No diet-culture noise. No miracle cures.
Built around how this medication actually works.
Nausea, and what helps
How common it is, how long a bout lasts, what the NHS suggests, where ginger fits, and when to call a doctor.
Constipation, the loop that works
Fibre, water, magnesium, movement, the four-part protocol most prescribers don't have time to walk you through.
Gallbladder and pancreatitis
Rare but real. The signs to recognise immediately, and who's at higher risk.
Mood, sleep, fatigue
The less talked-about ones. The data, the framework, and the path back to feeling like yourself.
What the studies actually say.
Evidence-based summaries of the papers that informed every part of this page. Each article cites its sources.
Nausea on a GLP-1: what helps, and when to get help
Nausea is the most common stomach side effect of Ozempic, Wegovy and Mounjaro. How common it is, how long it lasts, what the NHS and the experts suggest, where ginger fits, and…
Sulphur burps and gas on Mounjaro or Wegovy: why they happen, and what helps
Eggy burps, wind and bloating are listed side effects of Mounjaro and Wegovy. How common they are, why they can smell of sulphur, what to eat and avoid, why salad can suddenly…
Still hungry on Mounjaro or Wegovy? Why it happens, and what to do
Hungry on a GLP-1, or hungrier after a dose increase? The likely reasons, from low starting doses and long gaps between meals to the end of the injection week and your period, and…
Constipation on a GLP-1: the fibre, water, magnesium loop that actually works
Slower gastric emptying is how GLP-1s work. It is also why roughly one in four people on semaglutide develop constipation. Here is the protocol that fixes it without bringing back…
GLP-1 fatigue: why month two flattens you, and what to do about it
The exhaustion that hits at week six is one of the least talked-about side effects of GLP-1s. Here is the math behind it, not enough food, not enough protein, not enough…
Gallbladder risk on a GLP-1: what to watch for, and what protects you
Fast weight loss is the biggest single risk factor for gallstones. GLP-1s deliver fast weight loss. Here is what the data shows about the actual risk, and the small things that…
Pancreatitis on a GLP-1: rare, real, and exactly what to watch for
Acute pancreatitis on a GLP-1 is uncommon, but it is the side effect that earns a label warning for a reason. Here are the exact signs that should send you to A&E, and the people…
Mood, anxiety, and GLP-1s: what the data actually shows
There were reports. There were FDA reviews. There were headlines. Here is a careful look at what the suicidality and mental-health data on GLP-1s really says, and what to do if…
GLP-1s and sleep: better, worse, or both?
Some women sleep better the moment they start. Others develop new acid reflux at 3am for the first time in their lives. Here is what the literature says, and what to do if the…
GLP-1s and gastroparesis: separating the noise from the signal
Reports of severe stomach paralysis on GLP-1s made headlines in 2023. The data since has been more careful. Here is what gastroparesis is, who it actually happens to, and the…
GLP-1s and your heart: the protection that starts before the weight comes off
Ozempic and Mounjaro do more than shrink the scale. They lower the risk of heart attack and stroke, and the latest data shows the protection begins early, before most of the…
GLP-1s and fatty liver: what the new MASH approval actually means for you
Fatty liver is common, quiet, and more frequent in women than most people realise. In 2025 and 2026, GLP-1 medications became the first drugs approved to treat its serious form.…
Ozempic face: what it is, what helps, what doesn't
Loose skin and a hollow look after fast weight loss has a name now. It isn't the drug, it's the speed. Here's what the evidence says about slowing it down without slowing your…
Hair shedding on Ozempic: why it happens at month three, and what actually helps
Telogen effluvium is the medical name. Rapid weight loss is the trigger. Protein, iron, and patience are most of the answer.
GLP-1 Joint Pain and Knee Osteoarthritis: What the Research Actually Shows
GLP-1 joint pain and knee osteoarthritis: STEP-9 cut knee pain in mostly women, and new research hints at cartilage benefit beyond weight loss. The honest picture.
GLP-1s and your kidneys: the quiet organ these drugs may actually protect
Lost in the weight-loss headlines is one of the strongest findings about these drugs: they appear to protect the kidneys. For women with diabetes, PCOS or high blood pressure,…
Beyond weight: how GLP-1s calm inflammation, and why that quietly helps women most
The cancer findings, the heart findings, the autoimmune findings: a single thread runs under this year's GLP-1 research. These drugs lower inflammation. Here is what that means,…
Microdosing GLP-1s for inflammation, joint pain and a calmer mind: what the evidence shows
People microdose tirzepatide and semaglutide hoping for less inflammation, less joint pain, calmer autoimmune symptoms or a quieter mind. What the trials show at licensed doses,…
Loose skin after weight loss: what is real, what helps, and what to ignore
Loose skin is one of the most common worries women have about losing a lot of weight on a GLP-1. Here is the honest version: what causes it, what genuinely helps, and which…
Bone density on a GLP-1: a quiet question worth asking
Rapid weight loss has always affected bone. The GLP-1 era is a new test of an old finding. Here is what the early data shows, and the three small habits that protect your skeleton…
GLP-1s and cancer risk: what the new breast-cancer headlines actually say
Two 2026 studies linked GLP-1 medications to a large drop in obesity-related cancers, including roughly 30% lower breast cancer risk in women. Encouraging, real, and easy to…
Alcohol on a GLP-1: what changes, what doesn't, and the one drink that catches everyone out
The drug doesn't ban alcohol. Your body just reads it differently now. Here's what the early evidence shows about why drinking on a GLP-1 feels strange, and the practical rules…
GLP-1, the Brain, Dementia and Mood: The Honest Picture
What we know about GLP-1, brain, dementia and mood: lower dementia and addiction risk in observational data, but no benefit in early Alzheimer disease.
GLP-1s and gut health: fibre, the microbiome, and a calmer digestion
GLP-1s slow the gut, which is why constipation and bloating are so common. Here is how fibre, fluids and a few habits keep your digestion, and your microbiome, on your side.
GLP-1s and dry mouth, bad breath and your teeth: the oral-health side no one mentions
Dry mouth, bad breath and acid from occasional vomiting can quietly affect your teeth on a GLP-1. Here is the simple dental routine that protects your smile while you lose weight.
Eating less on a GLP-1: how to avoid nutrient gaps when appetite is low
When you eat a fraction of what you used to, it is easy to fall short on protein, iron, calcium and B12. Here is how women can keep the nutrients in while the calories come down.
GLP-1 medicines and anxiety: what the research actually shows
Some people feel calmer on Ozempic, Wegovy or Mounjaro. Others feel more anxious. The research points both ways depending on how it was done. What the trials, the large record…
Foods to Avoid on GLP-1: The Honest List, and Why Each One Hurts
Foods to avoid on GLP-1, handled honestly. Almost nothing is banned, but seven things reliably make a slow stomach feel worse. Here is the mechanism for each.
Fibre on GLP-1: The Constipation Fix, and How to Reach 25-35g Without Bloating
Fibre on GLP-1 constipation: why the medication hardens stool, how to reach 25-35g a day without bloating, and when psyllium actually helps.
Track nausea, fatigue and 12 more GLP-1 symptoms in one place. Free, and no sign-up.
Built around how your body actually works on Ozempic, Wegovy, Mounjaro and Zepbound. It runs in your browser, there is nothing to install, and nothing you type is stored.
For the daily version of this, food, dose, symptoms and the trend, there is the Foodose app for iPhone.