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Right this very second, sugar is circulating throughout the blood vessels in your body.
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And that sugar is supposed to be fueling your cells.
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But the balance of sugar in your blood
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and the amount of sugar going into your cells is actually a very tightly regulated metabolic process.
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But unfortunately, even in the year 2026, with all the technology and medical knowledge that we've accumulated,
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we still have more people with metabolic dysfunction than we've ever had before.
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And the main disease of metabolic dysfunction is diabetes.
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It's estimated that over 530 million adults have diabetes, and those numbers are even increasing in kids.
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And you might think, well, we just have more people on planet Earth.
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But even when we adjust for population, the percentage of people with diabetes has still increased dramatically, roughly doubling since the 1990s.
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And that's not just because human genetics have suddenly changed over the last 30 years, it's largely due to lifestyle changes.
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But if it's largely due to lifestyle changes, that means we can actually do something about it, especially with type 2 diabetes.
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So today, with the help of the bodies in the lab, we're going to walk through what diabetes actually is, type 1 and type 2,
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what causes it, what the long-term health consequences are if it's not treated, and whether or not you can actually cure it.
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It's going to be a sugary one.
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So let's jump into this anatomical and physiological awesomeness.
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So, before we take a look at a very important organ that has to do with diabetes, we first need to cover a key idea.
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Your body is constantly trying to control the amount of sugar in your blood, what we often refer to as blood sugar or blood glucose levels.
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So if I use blood sugar or blood glucose interchangeably throughout the video, just know that I'm talking about the same thing.
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Glucose is one of your body's primary fuel sources.
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Every time you eat carbohydrates, they're broken down and absorbed into your bloodstream, then causes your blood glucose levels to rise.
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But if that glucose just stayed in your bloodstream, it wouldn't be very useful.
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It actually needs to get to the inside of your cells.
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And that's where a very important hormone comes into play and that is insulin.
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And if we're going to talk about insulin, we definitely need to take a look at a real human pancreas.
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So just to orient you, you're looking at the inside of the abdominal cavity.
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So about right in this region.
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And here Here you can see the liver, here's the stomach, and if I reflect the stomach, you can see the pancreas.
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Anatomically, the pancreas can be divided into the head, the body, and even the tail that you can see me lifting up right there.
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And what makes the pancreas so interesting is that it's both an exocrine gland and an endocrine gland.
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The exocrine portion of the pancreas produces digestive enzymes and secretes those enzymes
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into the small intestine that you can see wrapping around right here.
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But the endocrine portion is what we care about today.
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Within this tissue are specialized cells called beta cells that produce insulin.
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And to understand exactly what stimulates the release of insulin from the pancreas and what insulin does once it enters the bloodstream,
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we're going to have to move over to our wonderful little diagram on the whiteboard.
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So here we have a picture of the pancreas and the first part of the small intestine.
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And full disclosure, I trace these.
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I'm certainly not a great artist as you can tell by my drawing of the cell.
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When I'm left to draw things on my own, we end up with cells looking like smiley faces.
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But you can totally tell that the outside is representing the cell membrane with some insulin receptors embedded here.
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We also have a blood vessel represented here.
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But when you eat carbohydrates, those carbs will get broken down and eventually be absorbed into the bloodstream as glucose, which will raise your blood glucose or blood sugar levels.
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And the glucose is represented as these black dots in the blood vessel.
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In response, the pancreas releases insulin, which are represented, the insulin molecules are represented by these blue triangles.
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The insulin will travel through the blood and will bind to the receptors on the surface of the cells.
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When insulin binds to those receptors, it essentially tells the cells to do this.
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eat the sugar.
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And the cell responds by taking in the glucose from the bloodstream.
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And so insulin lowers blood sugar levels by helping glucose move from the blood
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and into the cell where it can actually be utilized for energy.
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When this system works, your blood sugar stays tightly regulated.
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But when it doesn't, that's when we start running to issues such as diabetes.
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Diabetes is typically classified into two main types, type 1 diabetes and type 2 diabetes.
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Now the simplest distinction between the two is that with type 1 diabetes, you essentially don't have insulin.
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And with type 2 diabetes, you do have insulin, but it isn't working properly.
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But let's go into a little bit more detail.
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In type 1 diabetes, the immune system attacks and destroys the beta cells in the pancreas.
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And so technically type 1 diabetes is an autoimmune disease
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and this results in the pancreas losing its ability to produce insulin
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but no insulin means no signal telling the cell to take in the glucose so now we're going to have a
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sad cell unfortunately here with no glucose or sugar going inside
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and so what the result is is that glucose will stay in the bloodstream
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and this will therefore raise blood sugar levels
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Type 1 diabetes accounts for about 5 to 10% of cases and typically develops earlier in life.
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And this isn't really something that you can prevent.
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It is largely genetics combined with what we might simply call bad luck.
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With type 2 diabetes, the pancreas is still actually producing insulin, but the cells become resistant to its effects.
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Maybe you've heard people use the phrase insulin resistance, and this is what they're referring to.
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Insulin is still there, but the cells don't respond to it as well.
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And so you kind of might get something like this.
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Insulin will still bind to the receptor, but the cell or this resistant cell might respond to insulin by saying something like this.
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And that's obviously not very nice of the cell.
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And so as a result, glucose remains in the bloodstream and blood sugar levels rise.
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Now, before we move on, I want to briefly talk to you about GLP-1 medications in
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the context of weight loss by introducing you to the sponsor of today's video, Mochi Health.
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And before you diehards torch me in the comments, hear me out.
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Mochi Health is a telehealth platform that connects patients with licensed medical providers across a wide range of conditions, including metabolic health and weight management.
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And as we've been talking about in this video, when it comes to something like type 2 diabetes and insulin resistance, this isn't always just a simple matter of willpower.
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There are real physiological processes at play.
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Now, GLP-1 medications work by mimicking hormones involved in appetite regulation and blood sugar control, which can help some individuals reduce caloric intake and improve their metabolic health.
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But I want to be very clear here.
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I don't believe everyone needs to be on a GLP-1.
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In fact, many people can manage their weight and metabolic health very effectively through diet, exercise, and lifestyle changes.
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There are also people who genuinely struggle with this over long periods of time.
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And when you start weighing the potential benefits of a medication like this against the long-term risks of excess adipose tissue, some of which we're talking about in this video,
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you can see how this might make sense for certain individuals when used appropriately under medical guidance.
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And that's really where Mochi Health comes in.
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They provide access to licensed clinicians who can evaluate your individual situation, help determine if something like this is appropriate, and guide you through the process with ongoing support.
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So if you're interested, click the link in the description and use our code to get $40 off your first month.
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And now, let's get back to the video.
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So with both type 1 and type 2 diabetes, you do get a similar end result, and that is the elevation of blood sugar levels
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but through different causes and mechanisms and what's interesting about type 2 diabetes is
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that early on the pancreas actually tries to compensate by producing more insulin
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and almost like the pancreas is trying to yell at the cells
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or give them a stronger signal to take in the glucose
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and early on this actually does work to a degree so
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that in the very early stages of developing type 2 diabetes someone's blood glucose levels
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and a1c might still be normal so if a medical provider is still suspicious
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that a patient may be at risk for type 2 diabetes
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despite initial normal blood glucose levels they may consider additional testing like glucose tolerance testing
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and in some cases even looking at insulin levels to confirm
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that suspicion but over time this compensation of the pancreas producing extra insulin can't keep up
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and eventually the person's blood glucose begins to rise into pre-diabetic ranges and even eventually into full-blown diabetic ranges.
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And if someone with type 2 diabetes doesn't intervene with treatment, there are cases where the pancreas can start to wear out,
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meaning those insulin-producing cells begin to lose their function and start producing less insulin over time,
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eventually to the point where someone with type 2 diabetes may need to start taking insulin.
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So why is high blood sugar such a problem?
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Well, glucose itself isn't bad, but when it remains elevated in the bloodstream for too long, it begins to damage tissues, especially blood vessels.
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And this is where we start to see the real consequences of diabetes.
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Chronic high blood sugar can damage the inside lining of the blood vessels that supply critical tissues throughout the body.
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So damage to the blood vessels in the eye can lead to vision loss.
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Damage to the blood vessels in the kidneys can lead to kidney failure.
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And it's not just a blood vessel problem.
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Elevated glucose can also directly damage cells themselves, including nerve cells.
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And when it comes to nerves, it actually is a combination of both.
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Damage to the blood vessels that supply the nerves along with direct damage to the nerves themselves, which can lead to numbness, tingling, or loss of sensation.
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And this is called diabetic neuropathy.
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And over time, it can also cause damage to large blood vessels, increasing the risk of heart disease and stroke.
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But what actually causes the insulin resistance that leads to type 2 diabetes in the first place?
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Well there are some factors we can't control such as genetics
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and family history can increase your risk by two to three times.
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But there are also factors we can control.
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One of the biggest is the amount of fat or adipose tissue.
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As adipose tissue increases it releases signaling molecules called adipokines along with other inflammatory signals
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which can interfere with how cells respond to insulin making them more resistant.
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This is why increased body fat is strongly associated with type 2 diabetes,
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especially visceral fat which is the fat found inside your body cavities surrounding your organs.
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This type of fat tends to be more metabolically active than the subcutaneous fat found just beneath the skin
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and is one of the main reasons why visceral fat is more strongly associated with insulin resistance.
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The encouraging part is that reducing adipose tissue often improves insulin sensitivity.
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And so that often leads people to wonder, if I lose fat, especially visceral fat, can that help me prevent developing type 2 diabetes?
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And the answer is yes.
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Typically as fat levels go down, insulin sensitivity improves.
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And the primary ways we reduce fat are through exercise and diet, ideally a combination of both.
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Now there are some people out there who claim certain forms of exercise can specifically target
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or burn visceral fat more than the subcutaneous fat.
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But this is where we need to be a little careful.
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You can't perform a specific exercise like doing ab workouts or certain forms of cardio and directly target visceral fat only.
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That's not how fat loss works.
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When your body loses fat, it pulls from both visceral and subcutaneous fat.
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But here's where the nuance comes in.
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Visceral fat is more metabolically active
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which means it tends to respond more readily to things like a caloric deficit and regular exercise.
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So when people start exercising consistently and losing weight, they often do see reductions in visceral fat, sometimes even relatively quickly compared to subcutaneous fat.
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And that's likely contributed to where this idea of targeting visceral fat comes from.
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It's not that a specific exercise is only targeting visceral fat, it's that visceral fat is simply more responsive to the overall process of fat loss.
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Now obviously diet plays a huge role here but there is no single perfect diet.
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In general, prioritizing whole foods, managing total caloric intake, and maintaining a healthy body composition are going to be the biggest factors in reducing risk.
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And one other thing with exercise.
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Exercise doesn't just burn calories, it directly improves how your body handles glucose.
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When muscles contract during exercise, they can take in glucose without needing insulin, which is quite remarkable.
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After exercise, those same muscle cells become more sensitive to insulin and over time, consistent exercise leads to more mitochondria,
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more metabolic enzymes, and better overall glucose metabolism.
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And so in many ways, exercise directly targets the core problem in type 2 diabetes.
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Now preventing diabetes is one thing, but what if someone already has diabetes?
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How do you treat it and can you cure it?
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Well, for type 1 diabetes, the main treatment is insulin replacement because the body cannot produce it.
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And as of right now, we don't have a reliable way to restore that lost insulin producing capacity after the autoimmune destruction of those beta cells.
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So individuals with type 1 diabetes require insulin to survive.
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For type 2 diabetes, one of the main approaches to treatment is actually the same as prevention, and that is lifestyle changes such as diet and exercise.
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But this is often combined with medications, with metformin being one of the most commonly used first line treatments.
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But if blood glucose levels still aren't well controlled, additional medications may need to be added, such as GLP-1 receptor agonists,
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SGLT2 inhibitors, or in some cases even insulin.
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But again, here's the promising part.
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In some cases, individuals with type 2 diabetes can improve their condition so much through lifestyle modifications, diet, exercise, and weight loss,
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that their blood sugar levels can return to normal and they no longer need medication.
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And in a way, you might be tempted to think of this as a cure.
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But the medical community is careful about their wording and typically doesn't use the word cure in this instance.
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Instead this is referred to as remission because if those lifestyle factors change or if the underlying metabolic dysfunction returns, the diabetes can come back.
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But again, it is very cool
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that we have quite a bit of control over this
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and can reduce the long term consequences that unmanaged diabetes can lead to.
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the issues we discussed with the eyes, kidneys, nerves, and cardiovascular system.
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So hopefully you learned some useful information from today's video.
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Thank you so much for watching and supporting our channel.
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Of course, we'll see you in the next video.
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Vocabolario e note di pronuncia per questa lezione
Questa lezione di conversazione di livello C1 si basa sul video “The REAL Reason Diabetes Is So Dangerous”. Le parole che ritornano più spesso: insulin, diabetes, blood, type, cell. Questo video contiene 177 frasi e 2633 parole da ripetere con lo shadowing. Il parlato dura 15:22. Chi parla ha un ritmo naturale di circa 171 parole al minuto, vicino a una conversazione quotidiana. Solo il 81% delle parole rientra nelle 3.000 più comuni dell’inglese, quindi il lessico è impegnativo.
Vocaboli chiave di questo video
Le 15 parole più avanzate del video, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| insulin sostantivo | /ˈɪnsəlɪn/ | insulina |
| glucose sostantivo | /ˈɡluː.kəʊz/ | glucosio |
| pancreas sostantivo | /ˈpæŋ.kɹi.əs/ | pancreas |
| bloodstream sostantivo | /ˈblʌd.stɹɪim/ | flusso sanguigno |
| metabolic aggettivo | /mɛtəˈbɒlɪk/ | metabolico |
| receptor sostantivo | /ɹɪˈsɛp.tə/ | recettore |
| adipose aggettivo | /ˈæd.ɪ.poʊs/ | adiposo |
| subcutaneous aggettivo | /sʌbkjuːˈteɪnɪəs/ | sottocutaneo |
| diabetic aggettivo | /daɪəˈbɛtɪk/ | diabetico |
| dysfunction sostantivo | /dɪsˈfʌŋk.ʃən/ | disfunzione |
| enzyme sostantivo | /ˈɛn.zaɪm/ | enzima |
| genetics sostantivo | /dʒəˈnɛt.ɪks/ | genetica |
| kidney sostantivo | /ˈkɪdni/ | rene |
| consequence sostantivo | /ˈkɑn.sɪ.kwəns/ | conseguenza |
| autoimmune aggettivo | /ˌɔːtəʊɪˈmjuːn/ | autoimmune |
I phrasal verb che sentirai
| Parola | Significato |
|---|---|
| come back verbo | tornare |
| get off verbo | scendere |
| keep up verbo | mantenere, conservare |
| wear out verbo | fare fuori, consumare |
Frasi da ripetere
Frasi brevi e complete del video che puoi riutilizzare nella conversazione di tutti i giorni:
- Glucose is one of your body's primary fuel sources.
- How do you treat it and can you cure it?
- Of course, we'll see you in the next video.
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | can be divided · are specialized · be absorbed |
| Frasi relative who / which + frase — un’informazione in più su una persona o una cosa | glucose, which will · insulin, which are · control, which can |
| Present perfect have/has + participio passato — un’azione passata che conta ancora adesso | we've accumulated · we've ever had · has still increased |
Pronuncia a cui fare attenzione
Chi parla usa 34 contrazioni e forme ridotte, come we're, doesn't, don't. Pronunciale nella forma breve, così come le senti.
- I suoni “sh” e “zh”: dysfunction /dɪsˈfʌŋk.ʃən/, clinician /klɪˈnɪʃən/, specialize /ˈspɛʃəˌlaɪz/, modification /ˌmɑdɪfɪˈkeɪʃən/, sensation /sɛnˈseɪʃən/
- Parole lunghe — attenzione all’accento: metabolic /mɛtəˈbɒlɪk/, subcutaneous /sʌbkjuːˈteɪnɪəs/, carbohydrate /kɑɹboʊˈhaɪdɹeɪt/, physiological /ˌfɪz.i.əˈlɑ.d͡ʒɪ.kəl/, sensitivity /ˌsɛn.səˈtɪv.ə.ti/
I suoni difficili per chi parla italiano:
- /h/ — va soffiata, non è muta: carbohydrate /kɑɹboʊˈhaɪdɹeɪt/, hormone /ˈhoɹmoʊn/, diehard /ˈdaɪ.hɑɹd/, inhibitor /ɪnˈhɪbɪtɚ/
- Consonante finale — senza aggiungere una vocale dopo: glucose /ˈɡluː.kəʊz/, pancreas /ˈpæŋ.kɹi.əs/, metabolic /mɛtəˈbɒlɪk/, adipose /ˈæd.ɪ.poʊs/, subcutaneous /sʌbkjuːˈteɪnɪəs/
- /æ/ — più aperta della “e”: pancreas /ˈpæŋ.kɹi.əs/, adipose /ˈæd.ɪ.poʊs/, gland /ɡlænd/, cavity /ˈkæv.ɪt.i/, absorb /æbˈsɔɹb/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
- Registrati e confronta con l’originale, facendo attenzione a parole come insulin, glucose, pancreas.
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.