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What You Should Eat before Glucose Test?

What is a glucose test?

what to eat before glucose test
what to eat before glucose test

A glucose test is performed by analyzing a blood sample to determine glucose concentration (sugar) in the blood. 

How Glucose Test is Done

A blood sample will be drawn and placed in a vial for the venous glucose test.

Glucose (or sugar) in the blood may be measured in several ways. After ingesting a glucose-sweetened beverage, the most common tests are fasting blood sugar, average blood sugar, and blood sugar.

Fasting Blood Sugar: A fasting blood sugar test is a test done to measure the sugar level in your blood after you have fasted for at least 8 hours.

Blood Sugar After Eating: Blood sugar after eating is measured by taking a blood sample from a vein in the arm and measuring the sugar in the blood.

Another simple glucose test that requires just a little blood sample is the “finger stick.” If you want to use a glucometer to monitor your blood sugar levels at home, you will need to do a glucose test using a finger stick.

How To Prepare for the Glucose Test

Don’t make the mistake of missing breakfast just because you believe that your chances of acing the test would be better if you didn’t eat anything before the exam. Doing so may throw off your sugar levels completely. Instead, it would be best to have a meal the night before your glucose test and the morning of it. This meal should include a mix of healthy carbohydrates and protein.

Glucose Test in Pregnancy

A glucose test will be performed on you between weeks 24 and 28 of each pregnancy (or potentially earlier if you are at a greater risk of developing gestational diabetes). It will most likely take place in the morning. You will first consume a sugary beverage for this test, also known as the two-step or one-hour glucose test. 

Then, an hour later, your blood will be collected to determine the amount of glucose in it. 

What should you eat before you get your glucose test? 

Sticking with nutrient-dense meals high in complex carbs and fiber is best. Here are several examples:

  • Bread and pasta made with whole wheat.
  • Rice grits or quinoa, perhaps?
  • Lentils and other beans
  • Items made from nuts and nut butter
  • Oats
  • Seeds
  • Certain foods are low in sugar.
  • (Vegetables that do not contain starch)
  • Meat, poultry, fish, and eggs are all included.
  • Soy
  • Oils
  • Cheese

Foods to Avoid Before Glucose Test

In addition to the things you should consume, there are also items you should never eat. You should limit your consumption of foods high in sugar and simple carbohydrates. This might cause a surge in your blood sugar levels, resulting in a false positive during testing.

  • Sweetened cereals for breakfast
  • Choose between white bread and bagels.
  • A variety of chips and crackers
  • Smoothies made with fruit and yogurt
  • Donuts and baked goods (pastries)
  • Cupcakes, biscuits, and cakes
  • Ice cream
  • Candies
  • Soda, sweet tea, or sports drinks
  • Coffee sweetened with juice and fruit. 

Which Foods Reduce Blood Sugar?

Whole grains are packed with more fiber than their processed counterparts (more on those in the next section). Because the thread takes longer to digest than other types of food, meals high in fiber result in a slower conversion to glucose in the body, this indicates that eating fiber-rich foods may help minimize blood sugar increases.

The following are some examples of entire grains:

  • Bread, crackers, spaghetti, and other foods made from whole wheat.
  • Oatmeal
  • Rice with a brown crust

Why Is Glucose Test Done?

The glucose test is done for various purposes and primarily to detect Diabetics.

Checking For Diabetics 

While fasting, glucose monitoring is your blood is drawn in the morning for a routine screening for diabetes, during which the amount of sugar, also known as glucose, will be measured.

Typical results are estimated to be 99 milligrams per deciliter (mg/dL). In contrast, results between 100 and 125 mg/dL imply prediabetes, and results over 126 mg/dL suggest diabetes.

Check for Hemoglobin A1C

What exactly is it? Another test used to screen for diabetes is the hemoglobin A1C (HbA1c) test. This test produces a measurement that is an average of the blood glucose levels over the last two to three months. It is suggested that people over 45 and anyone with risk factors for diabetes have an HbA1c test.

A test below 5.7% is considered normal; a value between 5.7 and 6.4% indicates prediabetes, and a result over 6.5% indicates diabetes.

Results of Glucose Test

NameNormal RangePrediabetesDiabetes
Glucose testBelow 99mg/dL100 to 125 mg/dLOver 126 mg/dL
Hemoglobin A1CBelow 5.7%5.7 to 6.4%Over 6.4%

What are some Glucose Tests Done during Pregnancy?

Glucose challenge test

This screening test for gestational diabetes is done between 24 and 28 weeks of pregnancy. To begin with, you must consume a delightful beverage with fifty grams of sugar. After an hour, a sample of your blood will be taken and evaluated to determine how well your body processes sugar.

Levels of more than 140 mg/dL are considered high

A second test is needed to check the patient’s oral glucose tolerance and confirm or rule out gestational diabetes.

Is fasting required? No.

If you are going to do the glucose challenge test, then there is no need for you to adjust your diet or fast before the test.

Oral Glucose Tolerance Test (OGTT)

 It is necessary to detect gestational diabetes in pregnant people who have failed a glucose screening test. An oral glucose tolerance test, also known as an OGTT that lasts three hours, is necessary. After measuring your blood sugar while you were fasting to find your baseline, you will drink a drink with 100 grams of sugar, and your blood sugar will be checked every 60 minutes for the next three hours.

If your glucose levels are higher than 180 mg/dL, 155 mg/dL, or 140 mg/dL, you might have gestational diabetes.

In non-pregnant adults, glucose tolerance tests are also used to discover irregularities in the body’s reaction to glucose. Also, these tests may help determine if someone has prediabetes or type 2 diabetes better than a fasting blood glucose test.

Is fasting required? Yes. Except for food, only eat or drink something eight to fourteen hours before the test, not even small amounts of water.

You should also make an effort to eat more veggies in the weeks and days leading up to the test, and you should prioritize these foods above those that are heavy in sugar.

The consumption of snacks that are rich in protein, low in fat, and low in sugar (as well as carbohydrates), such as various protein shakes, is another fast and simple alternative to implement. Eating fruits might be a healthy alternative if you pick fruits with lower sugar content. Berries are preferable to fruits like pineapples and mangoes, which contain a high sugar concentration in their flesh.


Even though fruits are frequently a more healthful option for satisfying a sweet tooth, they include naturally occurring sugars that are converted into carbs. To be cautious, avoid eating fruit the night before or the morning of your glucose test.

Avoid processed carbohydrates and sweets in the hours before your glucose test. Instead, focus on complex carbs, proteins, and nutrient-dense fruits and vegetables. Brown rice, grilled chicken breast, and roasted broccoli are some ideas for dinner before a glucose test.

This does not necessarily indicate that you will have diabetes throughout your pregnancy. Your glucose levels are found to be outside of the normal range. In that case, you will undoubtedly be requested to do a more comprehensive glucose intolerance test to corroborate the results. This eliminates the danger of a false positive.

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