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T1D Education Center

Everything you need to understand Type 1 Diabetes — from the basics to daily management, technology, and emergencies. Written in plain language for patients, parents, and caregivers.

📚 Contents

What is Type 1 Diabetes? How It's Different from Type 2 Key Terms You'll Hear Daily Management Basics Technology Overview Emergency Situations

🔬What is Type 1 Diabetes?

Type 1 Diabetes (T1D) is an autoimmune disease where the body's immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. Without these cells, the body can no longer make insulin — a hormone essential for converting food into energy.

Insulin acts like a key that unlocks your cells so glucose (sugar from food) can enter and be used for energy. Without insulin, glucose builds up in the blood while cells starve. This is why people with T1D need to take insulin every single day to survive.

Key facts:

  • T1D accounts for about 5-10% of all diabetes cases
  • It can be diagnosed at any age, but most commonly appears in children and young adults
  • It is not caused by diet, lifestyle, or sugar consumption
  • There is currently no cure, but it can be managed effectively with insulin therapy
  • The exact cause is unknown, but genetics and environmental triggers play a role

⚖️How It's Different from Type 2

Type 1 and Type 2 Diabetes share a name, but they are fundamentally different diseases. Understanding the difference matters — because the treatments, causes, and daily realities are very different.

Type 1 Diabetes
Autoimmune disease. The body destroys its own insulin-producing cells. Requires insulin from day one. Cannot be prevented. Not related to weight or diet. Usually diagnosed in childhood or young adulthood.
Type 2 Diabetes
Metabolic disorder. The body still makes insulin but can't use it effectively (insulin resistance). Often managed with oral medications, lifestyle changes, and sometimes insulin. Risk factors include weight, age, and family history.

One of the most frustrating things for T1D families is hearing "just eat less sugar" or "try exercising more." Those are Type 2 conversations. Type 1 is an autoimmune condition — nothing the patient did caused it, and no lifestyle change can reverse it.

📖Key Terms You'll Hear

The diabetes world has its own language. Here are the terms you'll encounter most often:

A1C (HbA1c)
A blood test that shows your average blood sugar over the past 2-3 months. Expressed as a percentage. For most T1D patients, the target is below 7%. Think of it as your "report card" for blood sugar management.
Basal Insulin
The slow-acting "background" insulin that works 24/7 to keep blood sugar stable between meals and overnight. Delivered continuously by a pump, or via a daily injection of long-acting insulin (like Lantus or Tresiba).
Bolus Insulin
The fast-acting insulin taken at mealtimes to cover carbohydrates, or to correct a high blood sugar. Given as an injection or a pump dose. Starts working in 10-15 minutes and peaks in 1-2 hours.
IOB (Insulin on Board)
The amount of insulin still active in the body from recent doses. Important because stacking too much insulin before previous doses finish working can cause dangerous lows. Pumps and CGMs track this automatically.
Carb Ratio (I:C)
How many grams of carbohydrate are covered by one unit of insulin. For example, a 1:10 ratio means 1 unit of insulin covers 10 grams of carbs. Ratios vary by person and can change throughout the day.
Correction Factor (ISF)
How much one unit of insulin will lower your blood sugar, measured in mg/dL. For example, if your factor is 1:50, one unit of insulin drops your blood sugar by about 50 mg/dL.
Time in Range (TIR)
The percentage of time blood sugar stays in the target range (usually 70-180 mg/dL). A TIR of 70% or higher is generally considered good management. This has become as important as A1C for evaluating control.
Hypoglycemia (Low)
Blood sugar below 70 mg/dL. Symptoms include shakiness, sweating, confusion, irritability, and hunger. Treat immediately with 15g of fast-acting carbs (juice, glucose tabs). Recheck in 15 minutes.
Hyperglycemia (High)
Blood sugar above 180 mg/dL. Symptoms can include thirst, frequent urination, fatigue, and blurry vision. Usually corrected with a bolus of insulin. Persistent highs may indicate a pump site issue or illness.
DKA (Diabetic Ketoacidosis)
A dangerous condition where lack of insulin causes the body to break down fat for energy, producing ketones that make the blood acidic. Symptoms: nausea, vomiting, fruity breath, stomach pain. This is a medical emergency — go to the ER.

📋Daily Management Basics

Managing T1D is a 24/7 job. There's no day off, no vacation from it. But with the right knowledge and tools, it becomes second nature. Here's what daily life looks like:

Blood Sugar Monitoring

You need to know your blood sugar level to make decisions about insulin, food, and activity. This means either finger sticks (pricking your finger for a blood drop on a test strip) or wearing a continuous glucose monitor (CGM) that checks automatically every few minutes. Most modern T1D management relies on CGMs.

Counting Carbohydrates

Every time you eat, you need to estimate how many grams of carbohydrates are in the food — then take the right amount of bolus insulin to cover it. This becomes intuitive over time, but early on it means reading labels, using food scales, and learning portion sizes. Protein and fat also affect blood sugar, but carbs are the primary driver.

Taking Insulin

Insulin is delivered either through multiple daily injections (MDI) using insulin pens or syringes, or through an insulin pump worn on the body. You'll take basal insulin to cover background needs and bolus insulin at each meal and to correct highs. The goal is to keep blood sugar as close to the target range as possible.

Exercise & Activity

Physical activity affects blood sugar — sometimes dramatically. Exercise generally lowers blood sugar, which means you may need to reduce insulin or eat extra carbs before, during, or after activity. Every person responds differently, and learning your patterns takes time and experimentation.

Sick Days

Illness (even a common cold) can cause blood sugar to spike significantly. Sick day management means checking blood sugar and ketones more frequently, staying hydrated, adjusting insulin doses, and knowing when to call your endocrinologist or go to the ER.

📱Technology Overview

Diabetes technology has advanced dramatically. Here's what's available:

Continuous Glucose Monitors (CGMs)

A small sensor inserted under the skin (usually on the arm or abdomen) that measures glucose levels every 1-5 minutes and sends readings to your phone or receiver. Major CGMs include:

  • Dexcom G7: 10 or 15-day wear (G7 15 Day launched Dec 2025), no finger stick calibration, 5-minute readings, integrates with pumps
  • FreeStyle Libre 3: 15-day wear (Libre 3 Plus), continuous readings, smaller sensor, affordable
  • Medtronic Guardian 4: 7-day wear, designed for the MiniMed 780G pump system

CGMs are transformative. Instead of checking blood sugar 4-8 times a day with finger sticks, you have continuous visibility with trend arrows showing whether blood sugar is rising, falling, or stable.

Insulin Pumps

Small devices worn on the body that deliver insulin continuously through a tiny tube (cannula) inserted under the skin. They replace the need for multiple daily injections. Current options include:

  • Omnipod 5: Tubeless pod worn on the body, automated insulin delivery with Dexcom G7
  • Tandem t:slim X2 / Mobi: Tubed pumps with Control-IQ automated insulin delivery. The Mobi is the smallest insulin pump on the market and now Android compatible (Jan 2026)
  • Medtronic MiniMed 780G: Tubed pump with SmartGuard automated insulin delivery

Automated Insulin Delivery (AID / "Closed Loop")

The newest systems combine a CGM and pump that talk to each other through an algorithm. The system automatically adjusts basal insulin delivery based on CGM readings — increasing insulin when blood sugar rises and decreasing (or suspending) when it drops. This isn't a cure, but it significantly improves time in range and reduces the burden of constant decision-making.

Insulin Pens & Smart Pens

For those not using a pump, insulin pens are the standard delivery method. Newer "smart pens" (like InPen or NovoPen 6) track doses and timing, connect to apps, and calculate recommended doses based on your settings. They bridge the gap between traditional injections and pump therapy.

🚨Emergency Situations

Knowing how to handle diabetes emergencies can save a life. These are the situations every T1D patient and caregiver must know.

Severe Low Blood Sugar (Hypoglycemia)

Signs: Shakiness, sweating, pale skin, confusion, irritability, rapid heartbeat, dizziness, hunger, blurred vision. In severe cases: seizures, loss of consciousness.

What to do:

  1. If conscious: Give 15g of fast-acting sugar immediately — 4 oz juice, 3-4 glucose tabs, regular soda, or honey. Wait 15 minutes and recheck. Repeat if still below 70 mg/dL.
  2. If unconscious or seizing: Do NOT put anything in their mouth. Administer glucagon (injection or nasal spray like Baqsimi). Place them on their side. Call 911.
  3. After recovery: Follow up with a snack containing protein and carbs. Contact your endo team to discuss what happened.

Every person with T1D should have glucagon prescribed and easily accessible. Make sure family members, teachers, and caregivers know where it is and how to use it.

High Blood Sugar (Hyperglycemia)

Signs: Excessive thirst, frequent urination, fatigue, blurry vision, headache, nausea. Blood sugar consistently above 250 mg/dL.

What to do:

  1. Give a correction dose of insulin according to your correction factor
  2. Check for ketones (urine strips or blood ketone meter)
  3. Drink water — stay very hydrated
  4. If on a pump: check the infusion site. A kinked or dislodged cannula is a common cause. Change the site if in doubt.
  5. If ketones are moderate or high, or blood sugar won't come down after 2 correction doses: call your endo team or go to the ER

DKA (Diabetic Ketoacidosis)

THIS IS A MEDICAL EMERGENCY. Go to the ER immediately if you suspect DKA.

DKA happens when the body has too little insulin for too long. Without insulin, the body starts burning fat for energy, producing ketones that make the blood acidic. It can develop over hours to days.

Warning signs:

  • Nausea, vomiting, or stomach pain
  • Fruity or acetone-like breath
  • Deep, rapid breathing (Kussmaul breathing)
  • Extreme fatigue or confusion
  • Blood sugar above 300 mg/dL with moderate-to-large ketones

DKA is most common: at the time of initial diagnosis, when a pump fails and isn't noticed, during illness, or when insulin doses are missed. It is preventable with proper monitoring and insulin delivery. When in doubt, check ketones and call your doctor.

📚 Keep learning: This page covers the essentials, but diabetes education is ongoing. Work closely with your endocrinologist and certified diabetes educator (CDE). Join communities like Beyond Type 1, JDRF, and local T1D support groups. You're never alone in this.