Health Library Explorer
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A-Z Listings Contact Us

Understanding Type 1 Diabetes

To get energy, the body breaks down food into fuel. When you have diabetes, your body has trouble using this fuel for energy.

How the body normally gets energy

The digestive system breaks down food. This results in a sugar (glucose). Some of this sugar is stored in the liver. But most of it enters the blood. It travels to the cells to be used as fuel. Glucose needs a hormone called insulin to enter the cells. Insulin is made in the pancreas, an organ in the belly. The insulin is released into the blood in response to the presence of glucose in the blood. Think of insulin as a key. When insulin reaches a cell, it attaches to the cell wall. This signals the cell to make an opening that allows glucose to enter the cell.

When you have type 1 diabetes

Special cells (beta cells) in the pancreas actually make insulin. In most people, type 1 diabetes is an autoimmune disease. This means the body's immune system harms the beta cells. This decreases the amount of insulin made by the pancreas. In children, this often happens quickly. In adults, it isn't as fast. Without insulin, your cells can't get glucose to burn for energy. This is why you may feel weak or tired.

Glucose builds up

Without insulin, glucose can’t enter the cells. It stays in your blood instead. The liver also puts out even more glucose into the blood. This may lead to higher and higher blood sugar levels (hyperglycemia). Over time, high blood sugar levels can cause serious health problems.

Ketones form

When your cells can’t get glucose to burn for energy, they burn fat instead. This leaves behind acids called ketones in your blood and urine (ketosis). High blood sugar, high ketones, and other chemical changes in the blood (metabolic acidosis) can cause a dangerous condition called diabetic ketoacidosis (DKA). For some people, DKA is the first sign of type 1 diabetes.

Insulin can be replaced

The insulin you’re missing can be replaced with shots of insulin (injections). Insulin can't be taken by mouth. That's because it is broken down during digestion just like protein. But the insulin you’re missing can be replaced with shots (injections) of insulin. Some people also use insulin pumps. Then your body can burn glucose for energy. This helps keep your blood sugar in a healthy range.

Long-term complications

Over time, high blood sugar levels can harm blood vessels. This can lead to health problems (complications). Keeping your blood sugar in a healthy range can help prevent or delay complications. Balancing insulin, diet, and activity is important. This can help keep blood sugar levels in your target range. And it can prevent health problems. This is also true for regular check-ups, lab tests, and exams. Complications that may happen include:

  • Eye problems

  • Kidney disease

  • Nerve damage

  • Digestion problems

  • Sexual problems

  • Tooth and gum problems

  • Skin and foot problems

  • Heart and blood vessel disease

Online Medical Reviewer: Marianne Fraser MSN RN
Online Medical Reviewer: Raymond Kent Turley BSN MSN RN
Online Medical Reviewer: Robert Hurd MD
Date Last Reviewed: 6/1/2019
© 2000-2022 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.