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Why Is My Fasting Blood Sugar High

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Why Does Blood Sugar Go Up In The Morning What Is The Dawn Phenomenon

Why Are My Fasting Blood Sugars So High?

There are a few main reasons why your glucose levels may be higher in the morning. One of these is known as the dawn phenomenon.

The dawn phenomenon occurs early in the morning between 3 am and 8 am while you are still asleep. As morning approaches, the body naturally signals your liver to produce glucose, giving your body the energy it needs for the start of the day. Caused by changes in hormonal levels, the dawn phenomenon happens to all people, with or without diabetes. However, for those without diabetes, insulin levels increase and they do not experience hyperglycemia.

Another reason you may experience higher morning glucose levels is because your injected insulin wears off. If your body has insufficient insulin during the night, your glucose levels may start to rise. To combat this, you may consider trying a new basal insulin, adjusting the timing and amount of your basal dose , or changing your nighttime basal rates .

The last reason you may experience higher morning glucose levels is known as the Somogyi effect. This occurs if your glucose levels fall too low during the night, caused by too much insulin or medication. To respond, your liver produces more glucose to try to maintain your glucose levels, which may result in hyperglycemia. The Somogyi effect is not as common as the other reasons described.

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Possible Ways To Try To Lower Fasting Levels

  • Go for a walk after your evening meal exercise has a insulin type effect on the bodys cells which can impact many hours after and so may help lower fasting levels
  • Eat less carbohydrates in your evening meal although remember that it is important to still eat sufficient carbohydrates to avoid ketosis, so carbs must not be completely cut from the meal
  • Drink plenty of water take a glass of water to bed and have a drink when waking in the night
  • Eat a bedtime snack eating a snack before bed has been the biggest success with ladies in our support group. A snack which is high in protein and natural fat is believed to work best. Start with something like a couple of oatcakes and cheese, or a Ryvita with peanut butter. If this does not impact fasting levels, then try a high protein snack without the starchy carbohydrates
  • Apple cider vinegar drink 2 tbsp apple cider vinegar at bedtime with 1 oz of cheese. A small study9 in type 2 diabetic patients found that drinking 2 tbsp of apple cider vinegar and eating 1 oz cheese lowered fasting levels by 4%

Some ladies with gestational diabetes have had great success with apple cider vinegar and so its worth trying if you have the stomach for it!

Please note: As vinegar is acidic, it is advisable to dilute it in some water and brush teeth after consuming

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What Are The Signs & Symptoms Of High Blood Sugar Levels

Signs of high blood sugar levels include:

  • Peeing a lot: The kidneys respond by flushing out the extra glucose in urine. People with high blood sugar need to pee more often and in larger amounts.
  • Drinking a lot: Someone losing so much fluid from peeing that often can get very thirsty.
  • Losing weight even though your appetite has stayed the same: If there isnt enough insulin to help the body use glucose, the body breaks down muscle and stored fat instead in an attempt to provide fuel to hungry cells.
  • Feeling tired: Because the body cant use glucose for energy properly, a person may feel unusually tired.
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Causes Related To Personal Health

Insulin resistance

This condition occurs when the cells in your muscles, fat, and liver are unable to use the glucose in your bloodstream for energy. Your pancreas responds to this increase in glucose by producing more insulin to help your body process it. This excess amount of insulin in the bloodstream can eventually cause your body to lose insulin sensitivity or build resistance to it, leading to higher blood glucose levels.

Bodyweight and body fat

Research connects being overweight and having a higher body fat percentage with high blood glucose levels. In fact, a high body fat percentage might be a clearer indicator of high blood sugar and diabetes than weight or body mass index .

Other health conditions

Certain conditions could make you more likely to have high blood glucose. These include Cushingâs disease, polycystic ovarian syndrome , and gestational diabetes. Blood glucose may also rise as the result of common illnesses like a head cold or the flu.

Hormonal changes

It isnât just stress and sleep that can cause fluctuations in hormones. Illness, physical pain and trauma, menopause or menstruation can as well. In any of these instances, your blood glucose levels may rise due to the changes in your hormone levels.


Gut issues

A growingbody of research links imbalances in the microbiota living in our guts to an inability to regulate glucose levels in the blood. This is sometimes due to antibiotic use or infection.


Fasting & Elevated Blood Glucose

Blood Sugar Symptoms: How to low blood sugar fasting

Type 2 diabetes for 20+ years. Started keto with intermittent fasting in January 2019. Why would my fasting blood glucose numbers during my 18-24-hour fast be elevated, then come down to normal ranges after eating?


Fasting can definitely raise blood glucose. This is due to the effect of insulin falling and the rising counter-regulatory hormones including increased sympathetic tone, noradrenaline, cortisol and growth hormone, in addition to glucagon. These all have the effect of pushing glucose from liver storage into the blood. This is normal. If you are not eating, you want to use some stored glucose. The question is this if you are not eating, and your blood glucose went up, where did that glucose come from? It can only have come from your own body . So, its a natural phenomenon, and the fasting now allows your body to use some of the glucose for energy.

Dr. Jason Fung

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How To Prevent High Morning Blood Sugar

Do not fret, friends. There are ways to deal. Here are three simple ways:

1) Take insulin right when you wake up

If its 2 pm and you notice your blood sugar is shooting up for no apparent reason, youd take a correction dose of insulin to prevent that spike, right? .

The same concept applies here.

To determine how much insulin to take, wake up, record blood sugar values at 30 and 60-minute intervals, and record this for a few days . Then, you can use your insulin to carb ratio to determine a correction bolus.

2) Increase your basal rate around your wake up time

If you fight Dawn Phenomenon, whats a common strategy for success? Increasing basal rates in the wee hours of the morning to counteract that hormone-induced spike.

Well, if youre used to a particular morning routine and know itll take you a little while to prepare food and eat, consider increasing that basal rate during that time period. That additional insulin may overcome the liver dumping glucose and blunt your blood sugar spike, or ideally, prevent it in the first place.

3) If you skip breakfast, stop skipping it and EAT SOMETHING

As a registered dietitian, I can regurgitate all the information from the Academy of Nutrition and Dietetics about why breakfast is important. This isnt about that, but in all honesty here, try eating SOMETHING. Id love if it were healthy, but if youre just DYING to have Cinnamon Toast Crunch, by all means, have at it. If youre about the low-carb life, go for some eggs.

What Makes Pancreatic Juice And Insulin To Regulate Blood Sugar

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Relax It Is Normal Call It Adaptive Glucose Sparing

We definitely see that in people who are doing low carb long term, the majority will find that their fasting blood glucose becomes their highest value of the day, says Dr. Sarah Hallberg. They are not actually having issues with blood sugar. They are doing really well. But if you are looking at a log of 24 hours of blood glucose you will see a high first thing in the morning and then a steady decline throughout the day, with no big excursions even after meals.

As regular visitors will know, the pathologic kind of insulin resistance is caused by higher and higher levels of insulin hyperinsulinemia trying to force glucose into our cells. That insulin resistance is a prominent feature of type 2 diabetes, polycystic ovary syndrome and other chronic conditions.

So lets call physiologic insulin resistance instead adaptive glucose sparing, a name that has been proposed by many to reduce the confusion. Dr. Ted Naiman describes it as muscles that are in glucose refusal mode.

Prior to converting to the ketogenic diet, your muscles were the major sites to soak up and use glucose in the blood for energy. On a long-term keto diet, however, they now prefer fat as fuel. So the muscles are resisting the action of insulin to bring sugar into cells for energy, saying, in essence: We dont want or need your sugar anymore, so move it along. Hence, the slightly elevated, but generally stable, glucose circulating in the blood.1

How To Lower Morning Blood Sugar

Why is my sugar high in the morning?

Trying to learn how to lower morning blood sugar? Heres why your glucose levels rise in the morning and a few things you can try to keep them in range.

Waking up with high glucose levels may feel like it doesn’t make sense. You spend several hours asleep, not consuming any carbs, and yet somehow your glucose levels are still high when you wake up in the morning.

Why does this happen? What can you do to make sure your glucose levels are safely in range in the morning? Learn more about some tips on avoiding high morning blood sugar levels so you can start your day off right.

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Dawn Phenomenon And Somogyi Effect

In diabetics, there are 2 common ways that high fasting morning blood sugar arises. The first reason is the Dawn Phenomenon and this impacts individuals who are following a ketogenic lifestyle as well. Overnight as we sleep between the hours of 2-8am a slurry of hormones including cortisol, growth hormone, adrenaline and glucagon all begin to rise.

These hormones cause a gluconeogenesis effect where the liver and muscles break down their stored sugar to increase circulating blood sugar. This helps us have energy and mental arousal in the morning. This is a normal physiological response and it is normal for keto dieters to have slightly higher fasting blood sugaralthough it shouldnt be too high and you can mitigate this with the strategies discussed further on in this article.

Diabetics who are also taking exogenous insulin can also have something called the somogyi effect where they shoot too much insulin before bed and they have a blood sugar crash, followed by a huge increase in stress hormones that dramatically increases blood sugar through gluconeogenesis. This is obviously not an issue unless you are a type I or type II diabetic taking prescription insulin.

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Fasting Blood Glucose Increase While Intermittent Fasting

I have been Paleo for over 3 months now. Was told I am ‘pre-diabetic’ so I have started testing my blood glucose levels recently. What I have noticed is my morning levels are usually around 90 but 5-6 hours later , after having nothing but water my levels are usually around 110. Not a huge increase but my understanding was that during IF blood glucose should remain low and relatively constant. Anyone have any comments or ideas? I am male, mid forties, maybe 20lbs overweight, good health, workout 3x a week.Continue reading > >

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Why Doctors Order It

A fasting blood glucose test is done to screen for prediabetes and diabetes. It also helps doctors monitor diabetes and determine if medications and dietary changes are having an effect .

Your fasting blood glucose level is the lowest your blood sugar can be because the influence of recent meals is minimized .

Fasting blood sugar is often checked alongside HbA1c , which is a measure of your blood sugar levels over the past three months. The more sugar there is in the blood, the more it will attach to hemoglobin, raising HbA1c .

Taken together, the two offer more information than each test alone. For example, even if your blood sugar levels are very high at one random point, they may have been mostly low over the past couple of months . On the other hand, HBA1c could be higher but your glucose levels at the moment lower.

Apart from diabetes, abnormal levels can point out issues such as insulin resistance, hormonal imbalances, and pancreatic, liver, or kidney disease.

Bitter Melon For Diabetes Benefits How It Can Affect Blood Sugar Level

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What Happens If Your Blood Sugar Gets Too High

You re also at risk of developing heart disease, even if you don t develop diabetes.

In this work, we Blood Sugar Level propose the development of a new measure of glucose variability derived from the spectral clustering of glycemic signatures using time series specific distance metrics.

At first, you will be required to check your blood sugar levels up to 4 or more times a day, to make sure that the Why Is My Fasting Blood Sugar High During Pregnancy levels are in the normal range, without extremely high or low levels.

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Blood sugar monitoring helps you understand how What Is Normal Blood Sugar Level your blood Why Is My Fasting Blood Sugar High During Pregnancy sugars compare to your targets, and allows you to provide your doctor with specific data on your progress.

Fasting Blood Sugar Test

This test can be done in the lab or the healthcare providers office with a simple finger stickor your doctor may prescribe a meter and have you test regularly at home.

A fasting blood sugar level indicates what your blood sugar is when you havent eaten for at least 8 hours. For adults without diabetes, a normal fasting blood sugar is less than 100 mg/dL. A fasting blood sugar level of 100-125 mg/dL indicates prediabetes, and 126 mg/dL or higher indicates diabetes.

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