What Is Type 1 Diabetes?

People often assume type 1 and type 2 diabetes are mild and severe versions of the same thing. They're not. They share a name and a central problem — blood glucose running too high — but they start in completely different ways, and that difference shapes everything about daily life with each condition. The short video above (about a minute and a half) puts type 1 in its wider family: diabetes describes a group of conditions where glucose builds up either because insulin production is inadequate, or because the body's cells stop responding to insulin properly — or both. Type 1 is firmly the first of those.

Where the two types part ways: making insulin vs using it

Insulin is the hormone, made by the pancreas, that lets glucose move from the blood into your cells for energy. In type 1 diabetes, the immune system mistakenly attacks and destroys the insulin-making cells in the pancreas, so insulin production falls away — often to almost nothing. In type 2, by contrast, the pancreas still makes insulin, at least at first, but the body's cells respond to it poorly, and production can't keep up over time. If you'd like that side of the story in full, our guide to what type 2 diabetes is walks through it. The practical consequence is simple to state: someone with type 1 cannot manage without replacing insulin, because their body no longer supplies it.

Who gets it, and how it tends to show up

Type 1 is most often diagnosed in children, teenagers and younger adults, though it can appear at any age — another contrast with type 2, which usually develops gradually in adulthood. Type 1 symptoms often arrive over days or weeks rather than years: passing urine much more often, intense thirst, increased hunger, tiredness and weight loss despite eating normally. Those are exactly the warning signs the video's description highlights — frequent urination, growing thirst and hunger — because glucose that can't enter cells spills into the urine and pulls water with it, while the body goes hungry in the middle of plenty. Symptoms like these, especially in a child or young person, deserve prompt medical attention rather than a wait-and-see approach.

Daily life: monitoring and replacing what is missing

Because the body makes little or no insulin of its own, treatment centres on giving insulin back — by injections or by a small wearable pump — matched to food, activity and regular glucose checks. The site's "Insulin Pump" video (just under five minutes) explains how pumps deliver insulin through the day, one of the options your diabetes team may discuss with you. Monitoring is the other half of daily life: checking glucose with finger-prick tests or a continuous sensor helps you and your team see patterns, adjust insulin, and catch highs and lows early. Food and exercise still matter enormously — not because lifestyle caused type 1 (it didn't), but because carbohydrate, activity and insulin all interact, and learning that balance is the core skill of living well with the condition. With that learning, and a team you can reach when things wobble, type 1 is demanding but very manageable — most people with it work, play sport, travel and live entirely ordinary timetables around it.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician and researcher.

Frequently Asked Questions

Is type 1 diabetes caused by eating too much sugar?
No. Type 1 is an autoimmune condition in which the immune system destroys the pancreas's insulin-making cells. Diet and lifestyle don't cause it, though food choices remain an important part of managing it day to day.

Can type 1 diabetes be managed with tablets alone?
No — because the body produces little or no insulin, insulin itself has to be replaced, by injections or a pump. Other medicines are sometimes added, but they can't substitute for insulin in type 1.

What's the difference between type 1 and type 2 in one line?
In type 1, the body stops making insulin; in type 2, the body still makes it but responds to it poorly. That is why insulin replacement is essential from diagnosis in type 1.

Can adults develop type 1 diabetes?
Yes. It is most commonly diagnosed in children and younger adults, but it can begin at any age, and adults who develop it are sometimes initially mistaken for having type 2 — one reason an unexpected course is worth reviewing with your clinician.

Educational only — this article is general information about type 1 diabetes, not medical advice and not a diagnosis. If you or your child have symptoms such as extreme thirst, frequent urination or unexplained weight loss, seek medical care promptly, and discuss insulin and monitoring with your own diabetes team.