Which burns fat faster — fasting or Ozempic?
In this eye-opening interview, weight loss expert Dr. Jason Fung breaks down the truth about intermittent fasting and Ozempic (semaglutide) for fat loss. Are these weight loss injections worth the hype, or is there a safer, more natural alternative?
Dr. Jason Fung, Weight Loss Expert
🔥 Discover:
Why Ozempic might not be a long-term solution
The surprising benefits of fasting backed by science
How hormones—not calories—control your body fat
What most doctors won’t tell you about sustainable fat loss
Dr. Fung, author of The Obesity Code, shares real-world results, success stories, and science-based insights that challenge everything we think we know about burning fat.
💥 Whether you’re considering GLP-1 drugs or looking for a natural fat-burning strategy, this video will change the way you see weight loss.
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Will FASTING Burn Fat Faster than OZEMPIC? Dr. Jason Fung, Weight Loss Expert
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Inspired by No.1 Weight Loss Way: Eat Food That BURN FAT LIKE OZEMPIC
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Will FASTING Burn Fat Faster than OZEMPIC? Dr. Jason Fung, Weight Loss Expert
Transcript
Time Text
0:00
0:00 ozempic is the ozempic is the American name
0:02 and these are all in a class called
0:05 GLP1s They essentially really reduce the
0:08 appetite which goes to show you that and
0:10 people lose weight like a lot of weight
0:12 Weight loss injections like ompic and
0:15 Monaro promise shockingly big results
0:18 with a small needle But what if the
0:21 ancient practice of fasting is not only
0:23 safer but more effective if you want to
0:27 lose weight because it’s important then
0:29 you can just set aside a period of time
0:31 that you don’t eat Let your body eat
0:34 your body fat That’s what fasting is
0:36 doing for you And it’s totally natural
0:39 because that’s what it’s there for That
0:42 body fat is not there for looks It’s
0:44 there for you as a source as a store of
0:47 calories So fasting just lets you use
0:49 that World’s number one weight loss
0:51 expert Dr Jason fun puts modern medicine
0:55 head-to-head with our metabolic biology
0:58 to find out which actually works better
1:01 and why the answer will probably shock
1:03 you Even in the academic centers they
1:05 all think about sort of calories how to
1:08 get calories down how to reduce calories
1:10 And I always say well it’s not about the
1:12 calories right it’s about fixing the
1:14 hormones that are behind the calories
1:16 This isn’t just another health debate
1:18 We’re comparing the most hyped modern
1:20 drug with the most ancient healing
1:22 practice One costs thousands The other
1:26 is free One is prescription only The
1:29 other you can start today The big
1:32 promises of fat loss drugs GLP1 agonists
1:36 like OMIC promise dramatic fat loss The
1:39 lesson it’s teaching you about weight
1:41 loss is that it’s not about controlling
1:43 the calories because the doesn’t burn
1:46 any calories It’s about controlling your
1:48 hunger It’s about that one level deeper
1:52 Why are you taking so many calories so
1:53 if you simply reduce the hunger you’re
1:56 going to naturally eat fewer calories
1:58 which is going to cause weight loss And
2:00 that’s what this ismpic does It really
2:02 reduces your appetite to very low levels
2:05 Users report less hunger smaller
2:07 portions and massive sudden weight drops
2:10 Even Elon Musk credits them But is
2:13 appetite suppression enough for real
2:16 lasting change the old butt gold power
2:19 of
2:20 fasting fasting isn’t a fad It’s
2:23 hardwired into our biology Fasting
2:26 actually activates the body for example
2:28 is is very interesting because I think
2:30 it’s like if you’re a caveman for
2:32 example or cave woman and it’s winter
2:33 and there’s nothing to eat If your body
2:35 starts to shut down then evolutionarily
2:38 you’re going to die right because you
2:40 have less energy You can’t go out and
2:41 hunt So our body is just not that stupid
2:43 So what it does is it says “Okay well
2:45 I’m going to give you more energy So I’m
2:46 going to activate the body but then I’m
2:48 going to change where you’re getting
2:50 your energy from.” You’re not going to
2:52 get the energy from the food You’re
2:53 going to get it from your body fat
2:54 stores which is your stored food Dr
2:56 Jason Fun brought it back into the
2:58 spotlight not just as a tradition but as
3:01 a metabolic weapon Fasting doesn’t
3:04 suppress appetite it resets it How they
3:07 actually work fat loss drugs send
3:10 signals to your brain to eat less That’s
3:12 what this ompic does It really reduces
3:15 your appetite to very low levels How
3:17 it’s this this hormone called GLP1 uh
3:20 which is a natural sort of hormone It’s
3:22 it’s released mostly in the intestines
3:25 and the distal intestine and the small
3:26 intestine And in response to certain
3:29 foods it it goes up right so when you
3:32 eat the body has a homeostatic mechanism
3:35 So again remember you know people think
3:38 that we’re just eating machines We eat
3:39 until you know we explode sort of thing
3:41 but that’s not true When you eat you
3:44 actually activate the GLP-1 along with
3:47 other hormones There’s multiple hormonal
3:49 systems The GLP1 is the one we’re
3:50 interested in You activate GLP1 which
3:53 then sets into motion the the the
3:56 instructions for you to stop eating
3:58 right so the act of eating sort of sets
4:00 in motion that whole feedback loop to
4:03 stop right so this is homeostasis which
4:05 is trying to keep things at a proper
4:06 level They mimic a hormone glp1 that
4:10 tells your body I’m full Fasting it
4:13 triggers your natural fat burning mode
4:16 Insulin drops Growth hormone rises Bonus
4:20 insight Why the calories model fails For
4:23 decades we’ve been told to eat less move
4:26 more But what if that advice is outdated
4:29 or even harmful so we see this in almost
4:33 every single study We’ve known about it
4:35 for like 80 years at least You eat fewer
4:38 calories your body burns fewer calories
4:41 Well that’s going to limit how much
4:43 weight you’re going to lose right so
4:45 this idea that just eat fewer calories
4:47 will automatically lead to weight loss
4:50 is completely false because we know that
4:53:00 eating fewer calories leads also to
4:56:00 burning fewer calories So you eat 500
4:59:00 less your body but burns 500 less and
5:02:00 you’re not losing any body weight Dr Fun
5:04:00 calls out the calorie model as
5:06:00 fundamentally broken and introduces the
5:09:00 real culprit your hormones Well why
5:13:00 can’t you burn the fat that’s on your
5:14:00 body cuz there’s 200 300,000 calories of
5:18:00 body fat Why can’t you access it it’s
5:20:00 because you haven’t activated the right
5:22:00 hormones so that you can access it If
5:25:00 you eat the wrong foods and you’re
5:27:00 eating all the time so you’re eating 10
5:29:00 times a day eight times a day like
5:30:00 people say you should you’re eating low
5:32:00 fat so you’re eating tons of carbs
5:34:00 you’re spiking your insulin Insulin
5:35:00 prevents you from burning body fat Okay
5:38:00 so we’ve again we’ve known about this
5:40:00 for 80 years So now you eat 1,500
5:43:00 calories but you’re keeping your insulin
5:44:00 levels really high So fewer calories but
5:47:00 lots of high carb foods eating all the
5:49:00 time insulin stays high You’re you’re
5:52:00 taking in 1500 Your body is now burning
5:55:00 2,000 but you can’t burn any body fat So
5:58:00 the calories that are stored in your
5:59:00 body fat cannot be cannot be sort of
6:02:00 taken out It’s like it’s in the bank and
6:04:00 the bank is closed It’s you can’t take
6:06:00 it out The side effects they don’t talk
6:09:00 about Fasting builds resilience but
6:12:00 drugs may build dependency The GLP1s
6:15:00 then go to the brain So they do certain
6:17:00 things They help with digestion so they
6:19:00 increase insulin response And then they
6:21:00 go to the brain it crosses um the the
6:23:00 the the bloodb brain barrier So the
6:26:00 GLP1s gets released by the active eating
6:30:00 goes into the brain crosses and is
6:32:00 active um in the sort of midbrain area
6:35:00 that tells your body to stop eating What
6:37:00 these GLP1s do of course is that it
6:40:00 gives you the hormone that tells you to
6:42:00 stop eating even though you haven’t
6:44:00 eaten It’s sort of that’s that’s the way
6:46:00 the drug works So then what people tell
6:48:00 you is that you know they’re just not
6:50:00 hungry And if they’re not hungry then
6:52:00 they don’t eat And when they don’t eat
6:54:00 of course insulin falls and you start to
6:56:00 burn calories and lose weight Ompic
6:59:00 users often regain weight when they stop
7:01:00 Why because they haven’t fixed the root
7:03:00 problem hormone imbalance But it wasn’t
7:06:00 about controlling the calories It was
7:09:00 about controlling the hunger That was
7:11:00 the important part of it It’s the
7:14:00 hormones right every successful drug to
7:17:00 gain or lose weight right is a hormone
7:20:00 It’s a hormone based because that’s
7:22:00 instructions to the body Metabolism
7:24:00 boosted or broken Think fasting slows
7:27:00 your metabolism Think again One of the
7:30:00 things people talked about was you know
7:32:00 it’s going to make you eat more later
7:35:00 It’s going to make you more hungry Your
7:36:00 basil metabolic rate is going to go down
7:38:00 This was one of the big myths of
7:39:00 intermittent fasting That’s going to
7:40:00 cause the so-called starvation mode
7:43:00 right and this is the idea that your
7:44:00 basil metabolic rate will fall so low
7:46:00 that when you do start to eat you’re
7:48:00 going to gain weight again So I said
7:51:00 well let’s think about this You can do a
7:53:00 study where you take somebody say you
7:55:00 for example and you could fast them for
7:57:00 4 days and measure how much how many
8:00:00 calories they’re burning their basil
8:02:00 metabolic rate on day zero before the
8:04:00 fast and measure them 4 days into the
8:06:00 fast and see how many calories you’re
8:08:00 burning So on day zero they say you’re
8:11:00 you’re burning say 2,000 calories a day
8:13:00 On day four of zero food you don’t eat
8:16:00 any food for 4 days They measure how
8:18:00 much calories you’re burning Your body
8:19:00 is burning 2,200 calories Your basil
8:22:00 metabolic rate didn’t go down it went up
8:26:00 Studies show it actually boosts
8:28:00 metabolic rate shortterm Meanwhile
8:31:00 long-term reliance on drugs may
8:33:00 downregulate your natural hunger signals
8:35:00 Who loses more fat ompic curbs hunger
8:39:00 but fasting flips a metabolic switch So
8:42:00 you can go to 16 hours for example and
8:43:00 you shrink that by either eating
8:46:00 breakfast a little later or eating
8:48:00 dinner a little earlier But you can do
8:50:00 more than that You can do say a 24-hour
8:52:00 fast You could eat two meals a day say
8:54:00 eat between 12 and six That’s a 6-hour
8:56:00 eating window Or you could eat once a
8:58:00 day which is like a 24-hour fast Or you
9:00:00 could even go multiple days uh without
9:03:00 eating because again your body is smart
9:05:00 Like your your body knows what to do If
9:08:00 you have all those calories sitting on
9:10:00 your body right 100,000 calories sitting
9:13:00 in body fat and you don’t eat for 3 days
9:15:00 Well you need 6,000 calories Well you
9:18:00 have 100,000 200,000 So what’s the
9:20:00 problem take it out of your body fat Let
9:23:00 your body eat your body fat That’s what
9:26:00 fasting is doing for you After 16 hours
9:28:00 your body taps into stored fat With no
9:31:00 insulin in the way fat loss becomes the
9:34:00 default not the struggle What you do is
9:36:00 you do some intermittent fasting When
9:39:00 you fast insulin is going to fall That’s
9:42:00 the whole point Insulin is a hormone
9:44:00 that goes up when you eat It goes down
9:45:00 when you don’t eat Right so when you eat
9:48:00 insulin goes up Your body wants to store
9:50:00 energy When you don’t eat insulin goes
9:52:00 down Your body says “I have no energy I
9:55:00 have no food coming in Please take it
9:56:00 out of storage.” So now you take 1500
9:59:00 calories but you do intermittent fasting
10:01:00 So you’re allowing your insulin levels
10:02:00 to fall Now 1 1500 calories are coming
10:05:00 in Insulin levels are low Your body
10:08:00 wants to burn 2,000 calories It says
10:10:00 “Well insulin levels are low Let me take
10:12
500 calories from my body fat. Real”
10:14:00 results in the real world Thousands of
10:17:00 patients have reversed diabetes dropped
10:20:00 50 plus pounds and normalized blood
10:22:00 sugar without pills just fasting So his
10:26:00 weight starting just above 250 has been
10:29:00 steadily coming down and it’s down to
10:32:00 210 his waist size has continued to come
10:34:00 down and his hemoglobin A1C which is the
10:37:00 measure of his sugars has has stayed
10:39:00 relatively stable So he started off with
10:42:00 55 units of insulin and within you know
10:46:00 6 weeks he was off of all his insulin
10:49:00 These aren’t hacks They’re long-term
10:52:00 transformations Well she very quickly
10:54:00 lost about 20 lb and at her 3-month
10:57:00 checkup her hemoglobin A1C was 5.5%
11:02:00 well within the normal range and clearly
11:04:00 not
11:05:00 diabetic Better she had taken herself
11:08:00 off of all her medications as soon as
11:10:00 she started The cost
11:13:00 factor fasting is free Fat loss drugs
11:17:00 can cost over $1,000 a month So why is
11:20:00 one pushed harder than the other follow
11:23:00 the money I looked through all the
11:25:00 literature and I said “Well why is it
11:26:00 bad for you?” And they had all these
11:28:00 reasons there’s all these myths about
11:30:00 intermittent fasting and how it’s going
11:32:00 to cause you to gain weight and be tired
11:35:00 and hungry and all these sorts of things
11:36:00 I said “Well no there’s actually a lot
11:38:00 of data here over the last you know
11:40:00 2,000 years that we’ve used intermittent
11:42:00 fasting and they’re simply not true.”
11:44:00 And I can go over a few of those but
11:47:00 that’s why there was nobody talking
11:48:00 about it at the time And that’s where I
11:50:00 started to sort of bring it into the uh
11:53:00 sort of public consciousness that this
11:54:00 is a tool That’s all it is Were you
11:56:00 attacked for that at the time oh
11:58:00 absolutely Like I got I got attacked
12:01:00 from all sides I got you know doctors
12:03:00 were coming after me dietitians were
12:05:00 coming after me Everybody thought I was
12:07:00 going to do so much harm And the funny
12:09:00 part was that you know as I think back
12:13:00 as I spoke to a lot of colleagues a lot
12:15:00 of colleagues would say to me you know
12:16:00 what I used to do that when I was in
12:18:00 training We did that all the time We’d
12:20:00 go 24 hours without eating because we’re
12:22:00 in the O or we were in the ER or we were
12:24:00 busy So we did that constantly and
12:26:00 nothing bad happened You can’t sell a
12:28:00 fast but you can sell a shot The
12:31:00 biological reset versus the medical hack
12:34:00 Then there’s this whole process called
12:36:00 autophagy which is just fascinating And
12:38:00 autophagy is this um so it’s been very
12:41:00 topical cuz in 2016 one of the key
12:44:00 researchers was given the Nobel Prize in
12:46:00 medicine So it’s it’s a very important
12:48:00 process that’s been relatively recently
12:50:00 discovered What they discovered is that
12:52:00 when you don’t eat protein particularly
12:55:00 but when you fast your body activates
12:57:00 this thing called autophagy and it
13:00:00 breaks down some of the subcellular
13:02:00 organs which sounds really bad
13:04:00 Subcellular or organs Yeah So uh you
13:07:00 know these are sort of like the organs
13:09:00 within the cell So it’s not like the
13:11:00 liver but there’s something called
13:12:00 organels within a cell and some of that
13:15:00 is broken down So basically these
13:17:00 proteins and so on within the cell Your
13:19:00 body gets rid of that and you think “Oh
13:21:00 well that sounds really bad.” But it’s
13:24:00 not It turns out that it’s very very
13:26:00 good for you Fasting doesn’t just burn
13:28:00 fat it rejuvenates your cells Through
13:31:00 autophagy your body clears out old junk
13:34:00 and rebuilds stronger It’s an
13:37:00 opportunity for your body to get rid of
13:39:00 all this old protein old junky protein
13:42:00 And at the same time remember that
13:44:00 you’re fasting your growth hormone
13:46:00 levels are shooting up through the roof
13:48:00 So like a you know two three day fast
13:50:00 your growth hormone levels might have go
13:51:00 up five times So you’re getting rid of
13:54:00 all the old stuff and then when you eat
13:57:00 again you’re actually got growth hormone
13:59:00 to produce new proteins So in essence
14:03:00 you’re getting rid of the old you’re
14:04:00 bringing in the new It’s basically the
14:06:00 process of rejuvenation That’s not a
14:08:00 diet That’s evolution at work So which
14:11:00 works better if you want a quick fix
14:14:00 drugs deliver But if you want root cause
14:17:00 healing that’s free and powerful fasting
14:20:00 wins every time Let’s think about all
14:24:00 getting together and helping each other
14:26:00 to become so much healthier
14:30:00 Not through drugs and not through more
14:33:00 surgery and not with you know weird and
14:36:00 new things that you’ve never heard of
14:39:00 but with the tried and the true sort of
14:43:00 oldest thinking that has been there
14:45:00 right fasting versus fat loss drugs One
14:49:00 rewires your hormones the other just
14:51:00 rewires your habits
14:54:00 temporarily Learn which five special
14:56:00 foods Dr Dr Fung recommends to eat with
14:59:00 intermittent fasting to further cement
15:01:00 your successful weight loss
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