Connect with others who understand.

sign up log in
About DiabetesTeam
Real members of DiabetesTeam have posted questions and answers that support our community guidelines, and should not be taken as medical advice. Looking for the latest medically reviewed content by doctors and experts? Visit our resource section.

Fasting Blood Sugar Or Fbs As We Call It For Short, How Does This Work

Fasting Blood Sugar Or Fbs As We Call It For Short, How Does This Work

For those who have high fbs just remember it has nothing to do with what you ate the night before. Because usually we have a good 3 to 5 hrs between meals while awake, and our numbers are pretty decent in between meals. Also if you test your sugar level after 2 hrs of eating your last meal of the day, you will be at the highest peak at that 2 hr point and then your numbers start going down as per usual. So a meal you ate 8 to 12 hrs before you wake up, if anything should bring your numbers down… read more

A DiabetesTeam Member said:

There are other factors which also affect fbs :

The dawn phenomenon and the Somogyi effect cause high blood sugar levels, especially in the morning before breakfast, in people who have diabetes.

Dawn phenomenon
The dawn phenomenon is a normal rise in blood sugar as a person's body prepares to wake up.

In the early morning hours, hormones (growth hormone, cortisol, and catecholamines) cause the liver to release large amounts of sugar into the bloodstream. For most people, the body produces insulin to control the rise in blood sugar.
If the body doesn't produce enough insulin, blood sugar levels can rise. This may cause high blood sugar in the morning (before eating).
Somogyi effect
If the blood sugar level drops too low in the early morning hours, hormones (such as growth hormone, cortisol, and catecholamines) are released. These help reverse the low blood sugar level but may lead to blood sugar levels that are higher than normal in the morning. An example of the Somogyi effect is:

A person who takes insulin doesn't eat a regular bedtime snack, and the person's blood sugar level drops during the night.
The person's body responds to the low blood sugar by releasing hormones that raise the blood sugar level. This may cause a high blood sugar level in the early morning.
How can you tell the difference?
The Somogyi effect can occur any time you or your child has extra insulin in the body. To sort out whether an early morning high blood sugar level is caused by the dawn phenomenon or Somogyi effect, check blood sugar levels at bedtime, around 2 a.m. to 3 a.m., and at your normal wake-up time for several nights. A continuous glucose monitor could also be used throughout the night.

If the blood sugar level is low at 2 a.m. to 3 a.m., suspect the Somogyi effect.
If the blood sugar level is normal or high at 2 a.m. to 3 a.m., it's likely the dawn phenomenon.

The site above has other interesting articles and videos

You can also look up other diabetes sites, such as :

posted 3 months ago
A DiabetesTeam Member said:

So no matter what you ate before bedtime, your bodies are programmed since birth, each organ has its job whether the other organs work well or not. It is up to us to try and help our diabetic bodies by eating breakfast which ends up Breaking the Fast, so that our digestive system can start doing its job and not rely as much on our liver to shoot us up all the time. The stored sugar in our liver is meant as a back up measure for morning firing up, it is not meant to be used during long fasting periods, but because our brains need a certain amount of sugar to be able to control the rest of our bodies, the liver will try and step in so that the brain does not shut down completely, so when the liver senses starvation mode, it kicks in for us to be able to live. A low sugar level can kill us, or rather kills the brains cells, once the brain does not have enough sugar it will cease to work, so there is only so much sugar our livers can store up as a back up. The only way to get sugar into the blood stream is by eating, as once the food leaves the stomach and enters the intestines, that is where the sugar starts being processed. Hence why people in hospitals after a while will have tube feeding so their bodies will not go into starvation mode. It is also why if a person's sugar level is too low they will shoot them up with Dextrose IV (intravenous, or directly into the veins), so that the brain gets the sugar it requires to function.

This is like a car, if you do not feed it gas, it will stop working (digestive system). Or if your battery is dead (brain) your car goes nowhere. So you may have gas (sugar), but without the battery it still will not start, unless you temporarily boost it (CPR), but sometimes even with a boost your car will still not work, hence replacing the battery all together in a car, unfortunately our bodies cannot replace a brain, at least not yet.

Hope this helps some people understand about fbs and the importance of eating within 1 hr of waking up, or else you will be using your back ups (liver) and this will wear out over time. So try and keep your bodies well maintained so that everything works together. Where our pancreas fails, we are fortunate to have medications which can replace the pancreas, but they do have to be used the right way also, you still need to feed your system some sugar for it to work better.

posted 3 months ago
A DiabetesTeam Member said:

I`ve had many issues with this over the years and still do but i`m also a Type 1 so that might be different then those who are Type 2. Thanks for the info Jo....much appreciated.....🤗

posted 3 months ago
A DiabetesTeam Member said:

I never had a problem with fasting blood sugar as I know of. Hope the others helped u

posted 3 months ago
A DiabetesTeam Member said:

Thank you for sharing this useful information.👍🏾

posted 3 months ago
Already a Member? Log in