I’m a Pathologist: The "Biological Cost" of Ozempic and Mounjaro.

0:00 In 2024, humanity discovered something extraordinary.

0:04 [music] A weekly injection that could quiet hunger, stabilize blood sugar,

0:09 and melt weight faster than anything medicine had seen.

0:13 Headlines called it the end of obesity, the billiondoll miracle, the cure.

0:20 But I'm a pathologist, and in my world,

0:22 miracles don't really exist in this setting.

0:26 There's always mechanisms behind [music] everything.

0:29 Anytime you override a biological system that took 2 million years to evolve,

0:34 you are making a trade.

0:35 And every trade has an invoice, a cost to pay and a receipt.

0:40 Right now, the public conversation around GLP-1 medications,

0:44 some of as you may know them commercially, Ompic and Monero, is chaotic.

0:53 Half promise salvage and half warn of disaster.

0:58 Very few explain the biology.

1:01 So today we're going to fix that.

1:04 Please feel free to leave your experience in the comments below.

1:07 I read every single one.

1:08 I'm Dr.

1:09 Amin Haday, triple board certified pathologist,

1:11 physician, [music] and a susan clinical professor.

1:14 My career is spent reading the truth written inside human cells.

1:20 Cells don't argue.

1:21 Cells don't lie.

1:23 They respond to chemistry.

1:25 If clear science-based breakdowns like this help you,

1:28 feel free to like this video so more people can find evidence over confusion.

1:36 This video is your evidence-based mechanism first understanding of GLP-1 drugs.

1:42 How they work, why they work,

1:44 [music] why they sometimes backfire, and how to use them safely.

1:52 We'll walk through the evolutionary trap behind modern obesity,

1:57 the lizard brain that controls hunger,

2:00 the Gilla monster discovery that changed medicine,

2:04 the engineering behind 7-day appetite suppression,

2:08 the benefits, the trade-offs, and the real world risks.

2:13 And finally, the safe medically aligned exit strategy.

2:18 This is not fear.

2:19 This is not hype and it's purely physiology.

2:24 If you appreciate science explained clearly,

2:26 liking and subscribing helps these videos reach

2:29 more people who need clarity and not confusion.

2:33 So, let's begin.

2:34 You first have to understand why losing weight is biologically difficult.

2:40 Let me start with a truth almost no one hears from their doctor.

2:44 Obesity is not a moral failure.

2:47 It's an evolutionary success.

2:51 For 99.9% of human history, starvation, not overeating,

2:57 was the number one cause of death.

3:00 Anthropologists writing in the Journal of Human

3:04 Evolution describe how hunger shaped early human survival.

3:10 The people who could store fat the most efficiently survived.

3:14 Those who burned through calories quickly didn't.

3:19 So, you are the descendants of the world's best fat stores.

3:25 Your biology is optimized to survive scarcity,

3:28 but you live in an age of abundance.

3:31 Your genes expect famine.

3:34 You're surrounded by Uber Eatats and Door Dash.

3:38 And by the way, no affiliation.

3:40 This mismatch is what evolutionary biologists call an evolutionary mismatch.

3:47 Your biology is ancient.

3:50 Your environment is new.

3:53 And this conflict makes weight loss

3:56 feel like swimming against a biochemical current.

4:00 But it gets more interesting once you understand the wiring.

4:04 In the deepest part of your brain lies the hypothalamus,

4:09 the lizard brain, responsible for survival,

4:12 temperature, thirst, stress, and hunger.

4:17 This region defends your body fat set point with military precision.

4:24 It uses two hormones to do it.

4:26 Grein, which is essentially the gas pedal,

4:30 is produced by the stomach when empty.

4:33 It travels up the vagus nerve and says we need food.

4:38 This is primal overpowering and has been shown

4:43 in nature reviews endocrinology to override willpower completely.

4:48 Then we have leptin which is the break.

4:51 It's produced by fat cells.

4:54 When stores are full, leptin tells the brain, "We have enough.

4:58 Stop eating." But here's the problem.

5:01 In obesity, the brain becomes leptin resistant just

5:07 like you stop smelling perfume after a few minutes.

5:11 This is why someone can have 80, 100,

5:14 even 150 lbs of energy stored in their body and still feel hungry.

5:21 This isn't weakness, it's wiring.

5:25 GLP-1 medications override this broken circuit.

5:29 But the discovery didn't begin in a lab.

5:32 It began in a desert with a venomous lizard.

5:37 In the 1980s, scientists noticed something fascinating.

5:41 If you inject sugar into someone's bloodstream, the insulin response is small.

5:47 But if they drink the same sugar, the insulin response is huge.

5:53 Why?

5:54 Because the gut warns the body in advance.

5:59 Intestinal cells called L cells release a hormone called GLP-1.

6:05 GLP1 does three things immediately.

6:08 It prepares the pancreas for insulin.

6:11 It slows the stomach.

6:13 It tells the brain we're satisfied.

6:17 This is called the incretin effect.

6:20 first described in the journal of clinical investigation.

6:23 But natural GLP-1 breaks down in just

6:27 two minutes because of an enzyme called DPP4.

6:32 If scientists wanted to use GLP-1 as a drug, they needed to outsmart DPP4.

6:40 The breakthrough came from a creature most people

6:44 have never even heard of, the Gilla Monster.

6:48 In the deserts, there is a venomous lizard that eats only a few times a year.

6:55 A researcher named Dr.

6:57 John Ang discovered its venom contain a molecule

7:00 called extendin 4 described in endocrinology in 1992.

7:07 Accendin 4 acts like GLP-1,

7:11 binds the same receptor, but doesn't break down quickly.

7:16 It doesn't get sliced apart by DPP4.

7:19 It survives.

7:21 This was the blueprint for the first GLP-1 medications.

7:27 But modern scientists took this idea and engineered something far more powerful,

7:34 a hormone that can survive for 7 days.

7:39 This is the part that blows people's minds.

7:42 Smoglutide, the molecule in ompic and wiggoi is a triumph of modern chemistry.

7:51 Researchers wanted something that behaved like natural GLP1 but lasted

7:57 long enough to be effective as a weekly therapy.

8:02 They did two brilliant things and it was discussed in nature biology in 2017.

8:08 They changed one amino acid.

8:12 This prevents DPP4 from cutting the molecule.

8:16 They attached a C18 fatty acid tail.

8:20 This tail binds to albumin which is a massive

8:23 protein circulating in your blood for about a week.

8:28 Albamin acts like a cruise ship.

8:31 Semaglutide attaches to it and coast through your bloodstream for days.

8:37 A hormone that should last only 2 minutes now lasts 168 hours.

8:45 This one modification changed the landscape of metabolic medicine.

8:51 And then came the upgrade.

8:55 Terzepatite known as Monero and Zepbound doesn't activate just one receptor.

9:05 It activates two GLP1 and GIP.

9:09 The dual action was first described in the New

9:13 England Journal of Medicine in 2022 comparing tzipatite to semolutide.

9:20 When combined, GLP1 quiets appetite.

9:25 GIP stabilizes nausea and enhances glucose control.

9:32 This synergy allows for deeper appetite reduction

9:36 with potentially better tolerance for many patients.

9:40 This is why turepite often leads to greater average weight

9:44 loss than semlutide in clinical trials though individual results vary.

9:50 We've covered the evolutionary trap, the wiring,

9:54 the discovery, the engineering, and the upgrade.

9:58 Now, we need to talk about the part nobody explains clearly.

10:01 The trade-offs, the risks, the physiology behind side effects.

10:06 It's not fear, not hype, just biology.

10:10 GLP-1 medications work in part by slowing stomach emptying,

10:14 something documented extensively in gastroenterology research,

10:20 including clinical gastroenterology and hepatology in 2023.

10:25 For many people, this effect is mild and therapeutic.

10:31 It keeps food in the stomach longer, reducing appetite.

10:37 But for a subset of individuals,

10:39 especially at higher doses, this delay can become more pronounced.

10:45 Some people experience nausea, reflex,

10:47 bloating, early fullness, slower digestion.

10:52 Most of the time these symptoms are manageable

10:56 but sometimes they improve with dose adjustment but in rare

11:02 cases the slowing can be significant enough that clinicians

11:07 evaluate for delayed gastric emptying sometimes referred to as gastroparesis.

11:14 Case reports published in GI literature describe

11:17 a small number of patients developing more severe symptoms.

11:22 Bloating, vomiting, and difficulty handling solid meals.

11:27 Again, it's rare, but it's real.

11:32 Not a guarantee, but important to understand.

11:36 And then there's something patients don't hear until the day of surgery,

11:40 the anesthesia problem.

11:43 If your stomach empties more slowly than usual,

11:46 you may have residual food in your stomach even after fasting.

11:51 This matters because anesthesia turns off the protective airway reflexes.

11:57 If vomiting occurs while sedated, stomach contents can enter the lungs.

12:03 Sometimes anesthesiologists call this aspiration.

12:07 Because of this, the American Society of Anesthesiologists in 2023 issued

12:13 updated guidelines recommending special precautions

12:17 for patients on GLP-1 medications before surgery.

12:22 This doesn't mean anesthesia is unsafe, but it does mean your anesthesiologist

12:29 needs to know you're on these medications.

12:32 So, awareness is prevention.

12:36 Let's talk about the pancreas.

12:38 One of the most misunderstood topics in the GLP-1 discussion.

12:43 There have been reports of pancreatitis,

12:45 which is the inflammation of the pancreas in people taking GLP-1 medications.

12:51 Large clinical trials, including those published in gastroenterology in 2022,

12:57 show that the overall risk appears low,

13:00 but the prescribing information include caution for a reason.

13:05 People with a history of pancreatitis, very high triglycerides,

13:10 heavy alcohol use already carry a baseline risk for pancreatic inflammation.

13:17 For these individuals,

13:18 clinicians often use extra caution when considering GLP-1 drugs.

13:25 Most patients will never experience this issue.

13:28 But if someone on these medications develops persistent severe abdominal pain,

13:35 that is something a physician should evaluate.

13:38 This isn't fear.

13:39 It's simply understanding the physiology and respecting individual risk factors.

13:46 Every GLP1 medication has a boxed warning

13:50 related to thyroid sea cell tumors in animals.

13:55 specifically rodents.

13:58 Here's the nuance.

13:59 Rodents have many GLP-1 receptors on their thyroid C cells.

14:04 Humans have far fewer.

14:07 This is why rodent studies showed tumors and human studies

14:12 have not shown a clear increase at least so far.

14:17 This study was published in thyroid journal in 2023.

14:21 However, and this is important,

14:24 people with a personal or family history of medularary thyroid cancer

14:29 or the genetic condition men too are

14:33 generally advised not to take these medications.

14:37 Not because we've proven harm in humans,

14:41 but because we don't yet have 20-year population data.

14:47 This is what good medicine does.

14:49 It weighs uncertainty honestly and protects

14:54 the people who have known genetic vulnerabilities.

14:57 Muscle loss.

14:58 This is the most underrated biological

15:01 trade-off and one that surprises almost everyone.

15:05 When you lose weight quickly from any method, you lose both fat and muscle.

15:11 On GLP-1 medications, appetite drops dramatically.

15:16 Protein intake often decreases.

15:18 strength training becomes harder.

15:21 Nausea can reduce food variety.

15:25 Emerging studies, include those in the Obesity Journal in 2023,

15:30 show that without deliberate nutritional and resistant training support,

15:36 some patients lose a meaningful percentage of lean mass.

15:41 Why does this matter?

15:43 Because muscle is the engine of your metabolism.

15:48 The main side of glucose disposal, a buffer against insulin resistance,

15:56 a protector against falls, a predictor of longevity.

16:01 So less muscle means lower metabolic rate,

16:06 lower metabolic rate means easier weight gain.

16:13 This is not unavoidable, but without strategy, it is very common.

16:19 This is why the protein floor and strength training,

16:23 which we'll cover in the next part, are non-negotiable.

16:27 Now, let's talk about facial changes.

16:29 There's a lot of buzz about ompic face.

16:33 Here's the truth.

16:34 It's not the drug damaging the skin.

16:37 It's rapid fat loss.

16:40 When fat pads in the face shrink quickly,

16:43 the skin doesn't always retract at the same pace.

16:47 Plastic surgeons and dermatologists,

16:49 including those publishing in the aesthetic surgery journal in 2024,

16:54 describe this as a simple volume change.

16:59 It's not a toxicity reaction.

17:00 It's physics.

17:02 Slower, steadier weight loss preserves facial structure better.

17:07 Strength training and protein intake helps too.

17:12 This is a topic I hear quietly in clinics and see openly in support groups.

17:18 Some people describe feeling less impulsive,

17:22 less interested in food, calmer, more stable, and for many, this is a benefit,

17:29 especially those who struggle with emotional or binge eating.

17:34 But a subset describe something different.

17:38 Less motivation, less pressure, muted joy,

17:42 a grayscale feeling, lower reward drive.

17:48 It's not sadness.

17:49 It's not quite depression, just reduced spark.

17:55 Pre-clinical research in translational psychiatry published

17:59 in 2024 and ongoing human studies suggest

18:03 GLP-1 receptors in the reward pathways including

18:06 the nucleus encumbent may modulate dopamine signaling.

18:13 Not everyone, not dramatically in most, but enough for people to notice.

18:20 This is why monitoring your mental and emotional

18:24 landscape is important while on these medications.

18:29 If you feel flatter than expected, your clinician probably wants to know.

18:35 Now we arrive at the question everyone asks.

18:38 If I stop ompic or monero, will I gain the weight back?

18:43 The most evidence aligned answer is

18:47 many people regain weight without a strategy.

18:51 Not because they failed, because biology rebounds.

18:56 In the step one extension trial published

18:59 in New England Journal of Medicine in 2022,

19:02 participants regained roughly 2/3 of the weight they lost 12

19:08 months after stopping unless they had a robust lifestyle support.

19:13 Here's why this happens.

19:15 This is the part nobody explains clearly.

19:19 Hunger hormones surge back.

19:22 While on GLP medications, ghrein, your hunger hormone is suppressed.

19:28 When the medication leaves your system, ghrein doesn't return to baseline.

19:33 It overshoots.

19:36 This is well documented in metabolic

19:38 studies published in endocrine reviews in 2021.

19:42 Number two, appetite returns faster than satiety signals.

19:47 the brain stem, the hypothalamus regains sensitivity before the gut does.

19:54 That mismatch creates a transient hyper hunger period.

20:00 Number three is muscle mass has decreased.

20:04 During weight loss, people often lose some lean mass.

20:08 Less muscle means a slower metabolic rate.

20:12 This is well documented in obesity journals in 2023.

20:17 So when appetite returns, the engine is smaller.

20:24 Fat reaccumulates faster than muscle.

20:29 This is a universal physiological pattern called preferential atapose regain.

20:37 This was demonstrated in metabolism journal quite well in 2019.

20:42 Fat comes back quickly.

20:45 Muscle rebuilds slowly.

20:48 This combination creates what researchers call rebound physiology.

20:53 This is not about willpower.

20:56 This is not about character.

20:58 This is chemistry.

20:59 It's physics.

21:00 And physics can be engineered.

21:04 That brings us to the path forward,

21:07 which are my protocols that are based on peer-reviewed literature.

21:12 If you are on GLP-1 medications now, or if you ever plan to stop,

21:18 these next steps are core of protecting your biology.

21:23 Of course, this has to happen after you speak to your personal physician.

21:29 These protocols are supported by evidence from journals like sports medicine,

21:35 cell metabolism and nutrition reviews.

21:39 This is how you prevent muscle loss.

21:43 This is how you minimize rebound and land safely.

21:49 Rule number one, the protein floor.

21:53 This is a non-negotiable.

21:56 When appetite is low, protein is the first thing to disappear,

22:01 but it is the last thing your body wants to lose.

22:06 Aim for adequate protein intake daily.

22:10 Your clinician should guide your specific target.

22:13 If solid food feels heavy, there are alternatives such as clear whey isolate,

22:21 collagen and essential amino acids, dairy proteins, and egg white proteins.

22:28 Why?

22:29 Because leucine and other amino acids directly signal the muscle to stay intact.

22:37 Protein is proactively your muscle insurance

22:40 and muscle is your metabolic insurance.

22:44 This was shown in journal of physiology in 2020.

22:48 Rule number two, strength training is mandatory.

22:53 There is no drug, no supplement,

22:55 no hack that can replace mechanical load on muscle.

23:01 Resistant training two to four days per week is helpful.

23:06 You can try squats, deadlifts, rows, presses, pulls.

23:13 This signals your body, don't break down this tissue.

23:18 We need it.

23:20 Studies in sports medicine 2023 show that even 2 days per week

23:25 of resistant training can drastically reduce lean mass loss during weight loss.

23:32 This is not about looking fit.

23:35 This is about metabolic preservation.

23:38 Rule number three, taper slowly.

23:41 If you ever decide, of course,

23:43 in synergy with your medical doctor to come off GLP-1 medications,

23:49 do not stop abruptly.

23:51 A sudden drop in GLP1 signaling creates a rapid rebound in appetite.

23:57 A gradual taper allows hunger hormones to recalibrate,

24:02 satiety signals to normalize,

24:06 your routine to strengthen, your muscles to grow, your metabolism to stabilize.

24:13 This approach is supported by clinical

24:15 observations in obesity medicine practices and aligns

24:20 with the physiology described in endocrinology

24:23 and metabolism clinics which was published in 2022.

24:28 Your body needs time to readjust.

24:32 Give it that time.

24:34 Rule number four is use fiber as a mechanical satiety tool.

24:41 Once medication doses decrease,

24:44 your stomach begins sending hunger signals again.

24:49 To bridge this gap, use high volume,

24:51 low calorie foods to stretch the stomach's mechanical receptors.

24:56 You can uh try oats, beans, berries, vegetables, lentils, psyllium husk.

25:06 This strategy is backed by satiety

25:09 research published in appetite journal in 2020.

25:14 Chemical satiety by GLP1 transitions

25:19 to mechanical satiety with fiber and volume.

25:26 This is how you hand the baton from the drug to your stomach.

25:32 Rule number five, monitor mood, motivation, and joy.

25:37 GLP-1 receptors exist in the reward pathways of the brain.

25:43 Some individuals experience a calmer, quieter relationship with food,

25:49 which can be beneficial, but a smaller subset describe it muted emotional tone.

25:58 If your motivation drops, if you lose interest in hobbies,

26:04 if life feels flatter, speak with your physician.

26:08 Studies in translational psychiatry in 2024 are exploring this finding.

26:14 It may be dose related, transient, or it may require adjustment.

26:22 Your emotional landscape is as important as your metabolic one.

26:28 GLP-1 medications have taught us something profound.

26:32 Obesity is biology, not a moral issue.

26:38 For many, these medications reduce cardiovascular risk,

26:43 improve metabolic health, stabilize blood sugar,

26:48 calm obsessive food thoughts, break cycles that have lasted for decades.

26:55 For others, these drugs are a bridge,

26:58 a tool that helps them build new habits while biology stabilizes.

27:04 And for some, there are real tradeoffs that require careful navigation.

27:12 There is no oneizefitsall answer.

27:16 There is only informed consent, evidence-based decisionmaking,

27:21 and respect for the complexity of the human body.

27:26 You're not weak.

27:28 You're not broken.

27:30 You're not a moral failure.

27:33 You're a human being living in an environment

27:35 your biology was never designed for.

27:40 And now finally you have a tool, a powerful one,

27:44 pair it with a protocol that honors your physiology.

27:50 Thank you for your time, your curiosity,

27:52 and your commitment to understanding your body on a deeper level.

27:56 Let's continue building a life that is healthy,

28:00 coherent, energized, and uninflamed.

28:03 [music] I'm Dr.

28:05 Hayad and I'll see you in the next