Will Anxiety Cause Weight Loss on Mounjaro or Wegovy?

Anxiety activates the body's stress response, releasing hormones such as cortisol and adrenaline. These can suppress appetite in the short term, speed up digestion, and increase the body's overall energy use — all of which can lead to weight loss when stress or anxiety is sustained. Many people find they eat less when they are anxious, skip meals without realising, or experience gastrointestinal symptoms that reduce how much they absorb from food.

Where it gets complicated on a GLP-1 medicine

Mounjaro (tirzepatide) and Wegovy (semaglutide) already work through pathways that reduce appetite and slow stomach emptying. Both anxiety and these medicines can lower how much you want to eat. If you are losing weight faster than expected, or noticing reduced appetite that feels different from your usual pattern, anxiety could be a contributing factor — but so could a dose adjustment, a change in routine, or any number of other things. That is why tracking is so valuable.

Mood changes and GLP-1 medicines

Some people report changes in mood or anxiety levels while taking GLP-1 receptor agonists. This is a recognised area of ongoing research and monitoring. If you are experiencing new or worsening anxiety, or any significant mood change, it is important to raise this with your prescriber or doctor promptly — do not wait for your next routine appointment. You can also report unexpected side effects through your national reporting scheme (such as the UK's Yellow Card scheme) as well as to your healthcare professional. For more on how Mounjaro and anxiety are connected, that page covers the topic in more detail.

Other GI factors that can affect weight

Stress and anxiety are also known to affect the gut. If you are experiencing loose stools or diarrhoea alongside anxiety, this can compound weight loss further. It is worth knowing that diarrhoea and weight loss have their own relationship — and whether diarrhoea can cause weight loss is something many GLP-1 users find themselves wondering about too. The short answer is that persistent diarrhoea can lead to temporary weight fluctuations and should always be discussed with your healthcare professional if it is frequent or severe.

When multiple things are affecting your body at once — your medication, stress levels, sleep, appetite — a log is the clearest way to spot what is actually driving a change. GLP Trackr's side-effect and mood tracking lets you record how you are feeling each day alongside your weight and food intake, so that over time patterns become visible rather than guesswork.

The daily morning check-in — which takes about 30 seconds — captures mood, energy, sleep quality, and food-noise level alongside your weight. If anxiety is high on certain days and your appetite drops alongside it, that correlation will show up in your data. This kind of record is also genuinely useful to bring to your prescriber: instead of trying to recall "I think I felt worse around week four," you have a clear timeline to share.

The full guide to Mounjaro side effects covers the broader picture of what people commonly experience on these medicines, which can help you understand what is likely medication-related and what might be worth flagging separately.

A note on safety: if you are experiencing significant anxiety, mood changes, or unexplained rapid weight loss, please contact your prescriber or doctor — GLP Trackr helps you record what is happening so you can have that conversation, but it is not a substitute for clinical advice. Any concern about whether your symptoms are serious should go straight to a healthcare professional.

Start building your own picture — download GLP Trackr on the App Store or Google Play and get your first 7 days free. The mood and side-effect logs are there from day one.