Glucose comes from the Greek word for "sweet."
It's a type of sugar you get from foods you eat, and your body uses it for
energy. As it travels through your bloodstream to your cells, it's called blood glucose or blood sugar.
Insulin is a hormone that moves glucose
from your blood into the cells for energy and
storage. People with diabetes have higher-than-normal levels of glucose in
their blood. Either they don't have enough insulin to move it through or their
cells don't respond to insulin as well as they should.
High blood glucose for a long period of
time can damage your kidneys, eyes, and other organs.
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How
Your Body Makes Glucose
It
mainly comes from foods rich in carbohydrates, like bread, potatoes, and fruit.
As you eat, food travels down your esophagus to your stomach. There, acids and enzymes break it
down into tiny pieces. During that process, glucose is released. It goes into your intestines where it's absorbed. From there, it passes
into your bloodstream. Once in the blood, insulin helps glucose get to your
cells.
Energy and Storage
Your body is designed to keep the level of
glucose in your blood constant. Beta cells in your pancreas monitor your blood sugar level every few seconds.
When your blood glucose rises after you eat, the beta cells release insulin
into your bloodstream. Insulin acts like a key, unlocking muscle, fat, and liver cells so glucose can get inside
them.
Most of the cells in your body use glucose
along with amino acids (the building blocks of protein) and fats for energy.
But it's the main source of fuel for your brain. Nerve cells and chemical messengers
there need it to help them process information. Without it, your brain wouldn't be able to work well.
After your body has used the energy it
needs, the leftover glucose is stored in little bundles called glycogen in the liver and muscles. Your body can
store enough to fuel you for about a day.
After you haven't eaten for a few hours, your blood
glucose level drops. Your pancreas stops churning out insulin.
Alpha cells in the pancreas begin to produce a different hormone called
glucagon. It signals the liver to break down stored glycogen
and turn it back into glucose.
That travels to your bloodstream to
replenish your supply until you're able to eat again. Your liver can also make
its own glucose using a combination of waste products, amino acids, and fats.
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Blood Glucose Levels and Diabetes
Your blood sugar level normally rises after
you eat. Then it dips a few hours later as insulin moves glucose into your
cells. Between meals, your blood sugar should be less than 100 milligrams per
deciliter (mg/dl). This is called your fasting blood sugar level.
There are two types of diabetes:
- In type 1 diabetes, your body doesn't
have enough insulin. The immune system attacks and destroys cells of the
pancreas, where insulin is made.
- In type 2 diabetes, the cells don't
respond to insulin like they should. So the pancreas needs to make more
and more insulin to move glucose into the cells. Eventually, the pancreas
is damaged and can't make enough insulin to meet the body's needs.
Without enough insulin, glucose can't move
into the cells. The blood glucose level stays high. A level over 200 mg/dl 2
hours after a meal or over 125 mg/dl fasting is high blood glucose, called
hyperglycemia.
Too
much glucose in your bloodstream for a long period of time can damage the
vessels that carry oxygen-rich blood to your organs. High blood sugar can
increase your risk for:
- Heart disease, heart attack, and stroke
- Kidney disease
- Nerve damage
- Eye disease called retinopathy
People
with diabetes need to test their blood sugar
often. Exercise, diet, and medicine can help keep blood glucose in a healthy
range and prevent these complications.
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Healthy Glucose Levels & Shrinks Your Waistline While You Sleep
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