GLP-1 Medications and Cravings: How Ozempic, Wegovy, and Mounjaro Work
GLP-1 drugs may influence appetite and reward pathways, but evidence for effects on cravings is early and not fully understood.
Medicines like Ozempic, Wegovy, and Mounjaro have revolutionised the way doctors treat obesity and diabetes. These shots help people lose weight and manage their blood sugar levels. But what if they do even more?
Science backs this up. Brain scans show that these medicines quiet down parts of the brain that make you want food and light up the parts that help you feel full and satisfied. Some early studies even found that some people using these drugs drank less alcohol or used fewer opioids.
How is that possible? These medicines do not just work in the stomach. They also work in the brain. They act on areas involved in reward and motivation, such as the hypothalamus, VTA, and nucleus accumbens. These areas help control our "wanting" feelings. By changing how the brain uses chemicals like dopamine, these drugs may make cravings weaker and easier to ignore.
In this article, we will examine how these medications affect not only hunger but also habits and urges. You’ll learn how they work, how safe they are, and what this could mean for the future of health.
What Are GLP-1 Agonists and How Do They Affect Hunger and Cravings
GLP-1 agonists mimic natural gut hormones that regulate hunger. Early studies suggest possible effects on cravings, but evidence remains limited.
GLP‑1 agonists are medicines used to help treat type 2 diabetes and obesity. They copy a natural hormone in your body called GLP‑1, which is made in the gut after you eat.
Common types of GLP‑1 drugs
The first GLP-1 medicine, Exenatide, was introduced in 2005. Since then, others have been made, including:
- Liraglutide (Victoza for diabetes, Saxenda for weight loss)
- Dulaglutide (Trulicity), Lixisenatide (Adlyxin)
- Semaglutide (Ozempic, Wegovy, and Rybelsus, which is a tablet)
- Tirzepatide (Mounjaro and Zepbound) works on two gut hormones, not just GLP‑1.
Why were they made?
Your body’s natural GLP‑1 breaks down very fast, within 1 or 2 minutes. These drugs were made to last much longer, so they keep working in your body to help:
- Lower blood sugar
- Make you feel full
- Help you lose weight.
How do they work?
In the body (gut and pancreas):
- Help the pancreas release insulin when blood sugar is high
- Stop the liver from making too much sugar
- Slow down how fast your stomach empties so you feel full longer
In the brain:
GLP-1 receptors are also found in the brain, in areas that control hunger, reward, and emotions, such as the hypothalamus, VTA, and amygdala.
These medications appear to suppress hunger signals and alter the brain's response to food or other rewards.
|
What |
Details |
|---|---|
|
What they are |
Shots (or pills) acting as GLP-1 hormone |
|
Main job |
Lower blood sugar, reduce hunger, slow digestion |
|
Popular names |
Ozempic, Wegovy, Saxenda, Mounjaro |
|
Work in the |
Pancreas, stomach, brain |
How GLP-1 Medicines Work in the Body and Brain
These medicines slow digestion, regulate blood sugar, and interact with brain regions involved in appetite. Their impact on reward pathways is still being investigated.
Most people think these medicines only slow down digestion or help with blood sugar. However, they also work deep inside the brain, altering how we perceive food and other cravings.
1. In the Body (Peripheral Effects)
Slowing Down Digestion
These medicines slow down the movement of food through your stomach. This helps you feel full for a more extended period and prevents your blood sugar from spiking after meals. In one study, the time it took for the stomach to empty food increased from approximately 80 minutes to 140 minutes with the use of these drugs.
Helping the Pancreas
They help your body produce more insulin when your blood sugar levels are high. They also stop your liver from making too much sugar. This helps keep your blood sugar steady and supports weight loss.
2. In the Brain (Central Effects)
Working on Brain Circuits
GLP‑1 medicines don’t just work in the stomach—they also act on parts of the brain that control hunger and reward. These include the hypothalamus, VTA, and nucleus accumbens. Some of these drugs can enter the brain and change how you react to cravings.
Changing the Dopamine System
Dopamine is a brain chemical that makes you feel pleasure or "want" something. GLP‑1 drugs reduce this signal, so you don’t feel the same urge for junk food or even drugs like alcohol or cocaine. In lab tests, mice given GLP‑1 stopped seeking out these substances as much.
Balancing Brain Chemicals
These medicines may also affect other brain chemicals like serotonin and GABA. That could help reduce habits like overeating or smoking by calming brain activity.
3. Real-Life Changes in Cravings
Eating Less
In studies, people taking GLP‑1 medicines ate 16% to 39% fewer calories each day. They felt fuller and had fewer hunger pangs.
Choosing Healthier Foods
People on these drugs often lose interest in high-fat, sugary foods. Instead, they start to prefer more filling, protein-rich meals. This suggests that their taste preferences may be changing.
Drinking and Smoking Less
Some people taking semaglutide drank 30% to 65% less alcohol. Others said they smoked less or lost the urge to gamble.
Less Desire for Other Rewards
Some users say they also feel fewer urges to shop, gamble, or even have sex. This might be because dopamine signals are lower. However, a few people report feeling emotionally "flat" or experiencing less joy from everyday things.
4. The Full Picture: Two Ways These Medicines Help
|
Effect |
In the Body |
In the Brain |
|---|---|---|
|
Digestion |
Slows stomach emptying |
— |
|
Metabolism |
Increases insulin |
— |
|
Hunger |
Feel full longer |
Appetite suppression |
|
Reward |
— |
Reduced dopamine signalling |
These medicines don’t just help with weight; they also alter how the brain responds to cravings. That’s why they may help with addictions and other habits, too. It’s a potent mix of body and brain working together.
Clinical and Real-World Evidence of GLP-1s on Cravings
Studies show reduced hunger and calorie intake, but craving-related effects are based on early research and patient reports rather than confirmed clinical trials.
GLP‑1 drugs like semaglutide and tirzepatide don’t just sound promising; they’ve been tested in big studies and are helping real people every day.
Semaglutide: STEP Trials
STEP 1 Trial
- People took 2.4 mg of semaglutide each week and made lifestyle changes.
- After 68 weeks, they lost almost 15% of their body weight.
- People who got a fake shot (placebo) only lost about 2.4%.
STEP 5 Trial
After 2 years, people still kept the weight off—around 15.2% weight loss, and over 60% lost at least 10% of their starting weight.
STEP UP Trial
- This newer study used a higher dose (7.2 mg).
- People lost over 20% of their weight, and 1 in 3 lost more than 25%.
Tirzepatide: A Dual-Action Star
SURMOUNT-1 Trial
People on tirzepatide lost up to 20.9% of their body weight after 72 weeks.
Higher doses led to even better results.
Three-Year Data
Weight loss stayed strong; on average, people kept off about 19.4%, and some lost over 30%.
There was very little weight regain.
How People Felt
Many said they felt:
- Less hungry (41%)
- Fewer cravings (22%)
Real Life vs Clinical Trials
Big studies show strong results. But in real life, it can be harder.
A study of 8,000 people showed:
- People who stayed on the medicine lost about 12% in 1 year
- People who stopped early lost only about 3.6%
Why the difference?
- Missing doses
- Lower strength
- Side effects
- Supply problems
- Cost
People who followed treatment closely still achieved significant weight loss, up to 18%, with tirzepatide.
What About Cravings?
Both semaglutide and tirzepatide helped people:
- Eat less overall
- Feel less hungry
- Crave junk food less
This isn’t just about eating fewer calories. These drugs change how your brain works, making people want food less, especially unhealthy food.
|
Medicine & Study |
Time |
Changes |
|---|---|---|
|
Semaglutide STEP |
68–104 weeks |
14.9–15.2% weight loss |
|
Tirzepatide |
72 weeks–3 years |
20.9%–30% |
|
Real-world |
1 year |
12% if continued |
GLP‑1 medicines help people eat less, not by willpower, but by changing how their bodies and brains work.
Side Effects and Safety of GLP-1 Medications
GLP-1 medicines commonly cause digestive symptoms and may pose rare risks. Craving-related effects are not part of their approved safety profile.
GLP‑1 drugs can be life-changing, but they’re not perfect. It’s essential to be aware of potential side effects, risks, and what may happen if you stop taking them. Here’s what you and your doctor should keep in mind.
1. Tummy Troubles Are Common
Many people have stomach problems when they first start GLP‑1 medicines:
- Nausea
- Vomiting
- Diarrhoea
- Constipation
- Bloating or a full feeling
These issues are more common when the dose increases too rapidly. They often get better over time. That’s why doctors start with a low dose and increase it slowly, about every 4 weeks.
Short-acting GLP‑1s cause more nausea. Long-acting ones (such as semaglutide or tirzepatide) are usually easier to manage.
2. Other Health Risks to Watch For
Pancreatitis (pancreas swelling):
There were early worries about this, but big studies show that GLP‑1 drugs do not raise the risk for most people. Still, doctors are careful if you’ve had it before.
Gallbladder problems:
Some people, especially on tirzepatide, may have a higher chance of gallbladder issues. This can include pain or gallstones.
Thyroid tumours (in animals):
In rats, these drugs caused rare thyroid tumours. Humans have not shown the same risk, but people with a family history of thyroid cancer or MEN 2 (a rare condition) should avoid these drugs.
Small lab changes:
Some people experience a slight increase in pancreatic enzymes. Hair thinning is also reported sometimes, but it's usually mild and temporary.
3. Mental Health and Emotions
Some users say they feel:
- Anxious
- Moody
- Sleep problems
- “Flat” or emotionally numb
4. What Happens If You Stop?
Many people gain weight back after stopping GLP‑1 drugs.
In one study, people regained two-thirds of the weight they had lost within a year of stopping treatment.
In the real world:
- Half of the people stop within 1 year
- Most stop by in 2 years
- To avoid weight regain, you need a long-term plan. This might include:
- Slowly stopping the drug
- Eating well
- Staying active
- Getting support
Summary Table For Side Effects
|
Problem Area |
Possible Issue |
What to Do |
|
Stomach |
Nausea, bloating, constipation |
Start low, go slow, stay hydrated |
|
Pancreas/Gallbladder |
Pancreatitis, gallstones |
Check your history; talk to your doctor |
|
Thyroid |
Tumour risk in rodents (not proven in people) |
Don’t take it if you have thyroid cancer in your family |
|
Mental Health |
Mood changes, feeling flat |
Keep track of your feelings; ask for support |
|
Stopping the Drug |
Quick weight regain |
Plan: use healthy habits to stay on track |
Maximising Results with GLP-1s for Craving and Weight Control
Healthy eating, physical activity, and behavioural support can improve overall treatment outcomes. Craving reduction varies widely and is not guaranteed.
1. Eat Smart – Focus on Good Nutrition
Eat More Protein
Try to get 25 to 30 grams of protein with each meal. This helps you feel full and keeps your muscles strong as you lose weight.
Choose Nutritious Foods
Since you’re eating less, it’s essential to make your food count. Pick foods rich in vitamins like:
- Leafy greens
- Berries
- Fatty fish
- Beans and lentils
- Nuts and seeds
Eat Mindfully
Take your time with meals. Eat slowly, enjoy each bite, and stop when you feel full. This helps you notice your hunger signals and avoid overeating.
2. Stay Active: Move Your Body
Strength Training
Lifting weights or doing bodyweight exercises 2–3 times a week keeps your muscles strong during weight loss.
Cardio Exercise
Walking, biking, or swimming helps your heart and burns energy.
Everyday Movement
Even small things help:
- Take the stairs
- Stand up often
- Do stretches during breaks
3. Control Cravings: Simple Tricks
Plan Your Meals
Having regular meals stops you from getting too hungry or reaching for snacks without thinking.
Keep Healthy Snacks Nearby
If you feel a craving, try a piece of fruit, veggie sticks, or a warm drink like herbal tea instead.
Understand Your Feelings
Sometimes, we eat when we're bored, sad, or stressed. Try things like:
- Journaling
- Breathing exercises
- A short walk
- to manage emotions without food.
4. Get Support: Mentally and Emotionally
Emotionally
Talk to Someone
Therapists can help you understand why you eat the way you do and teach you new habits.
Join a Group or Coaching Session
It’s easier when you’re not alone. Sharing your journey with others helps you stay motivated.
Have Regular Check-Ups
Visit your doctor or dietitian every few months. They’ll help adjust your dose and make sure everything’s going well.
5. Think Long-Term: Plan Ahead
Check Your Progress
Every 3-6 months, look at your:
- Weight
- Cravings
- Side effects
- Mood and energy
Slowly Lower the Dose (If Ready)
If you and your doctor decide to stop the medicine, reduce it gradually. Maintain healthy habits to prevent weight gain and maintain a healthy weight.
Build a New Routine
Continue eating well, staying active, and seeking support even after stopping the medication.
Conclusion
Healthy eating, physical activity, and behavioural support can improve overall treatment outcomes. Craving reduction varies widely and is not guaranteed.
GLP‑1 medicines like Ozempic, Wegovy, and Mounjaro don’t just help you eat fewer calories; they also help your brain stop craving food so much. These medicines work in two main ways: they make you feel full for longer by slowing stomach emptying, and they calm the parts of your brain that trigger cravings for comfort or enjoyment.
People taking these medicines often say they’re not as hungry and don't think about food as much. Some even say they’ve stopped wanting things like alcohol or cigarettes. However, for the best results, it’s also essential to eat healthily, stay active, and seek support if you're feeling stressed or down. These medicines work best when they’re part of a complete plan, not just taken on their own.
