Skip to content

Diabetes Health Center

Glucose Testing: After Meals?

Should diabetics test their blood sugars after eating, too? The debate continues.
Font Size
A
A
A
By
WebMD Feature

Every diabetic is familiar with fasting blood glucose tests. You don't eat for at least eight hours, you check your blood sugar, and by that, you establish what your baseline glucose is.

This was at least the traditional idea of blood sugar testing. But given that most of us spend a lot of the day -- maybe even most of the day -- having eaten something within the last few hours, can we really call the glucose levels we have after eating "abnormal"? In fact, isn't it more abnormal to go eight hours during the day without eating or drinking anything?

Recommended Related to Diabetes

Traveling With Diabetes

If you have diabetes, traveling for vacation or business requires extra planning. Changes in meal patterns, activity levels, and time zones can affect your blood sugar levels. That's why it's important to have some key reminders to make traveling with diabetes much easier.

Read the Traveling With Diabetes article > >

In short, this is the idea behind postprandial -- or after-meal -- glucose testing. Since we spend so much time in a postprandial state, the argument goes, it's important to monitor blood glucose levels during that time, too. While it may make intuitive sense, postprandial testing is one of the most hotly debated subjects in diabetes care. Is it an important new way of testing blood glucose that will reshape diabetes treatment, or is it merely a distraction from what's really important?

Setting the Limits

Paul Jellinger, MD, past president of the American Association of Clinical Endocrinologists (AACE), is a firm believer in the importance of postprandial testing. In 2001, when Jellinger was president of AACE, the organization issued a consensus paper on diabetes treatment that discussed postprandial testing.

"What we came up with was a number of new guidelines for postprandial testing," Jellinger tells WebMD. "We made a recommendation that a person's postprandial blood sugar, taken two hours after eating, should not exceed 140 mg/dL."

How did they arrive at that limit? Given the ways in which we all eat, postprandial testing would seem inherently imprecise; for instance, the glucose level of someone who just ate a salad for lunch might be pretty different from someone who just finished a Thanksgiving dinner. To resolve this issue, the AACE set a cutoff based on a comparison of the typical glucose levels of diabetic and non-diabetic people after eating.

"We know that in a normal person without diabetes, it's very rare for his or her blood sugar to exceed 140 mg/dL two hours after a meal," says Jellinger. "It can happen, but not often."

However, Jellinger is quick to concede that the cutoff number has been contentious. Just because people without diabetes don't usually reach a blood-glucose level of more than 140 mg/dL does not necessarily mean that anything above that particular number increases the risks of diabetic complications.

1 | 2 | 3 | 4

Is This Normal? Get the Facts Fast!

Check Your Blood Sugar Level Now
What type of diabetes do you have?
Your gender:

Get the latest Diabetes newsletter delivered to your inbox!


or
Answer:
Low
0-69
Normal
70-130
High
131+

Your level is currently

If the level is below 70 or you are experiencing symptoms such as shaking, sweating or difficulty thinking, you will need to raise the number immediately. A quick solution is to eat a few pieces of hard candy or 1 tablespoon of sugar or honey. Recheck your numbers again in 15 minutes to see if the number has gone up. If not, repeat the steps above or call your doctor.

People who experience hypoglycemia several times in a week should call their health care provider. It's important to monitor your levels each day so you can make sure your numbers are within the range. If you are pregnant always consult with your health care provider.

Congratulations on taking steps to manage your health.

However, it's important to continue to track your numbers so that you can make lifestyle changes if needed. If you are pregnant always consult with your physician.

Your level is high if this reading was taken before eating. Aim for 70-130 before meals and less than 180 two hours after meals.

Even if your number is high, it's not too late for you to take control of your health and lower your blood sugar.

One of the first steps is to monitor your levels each day. If you are pregnant always consult with your physician.

Did You Know Your Lifestyle Choices
Affect Your Blood Sugar?

Use the Blood Glucose Tracker to monitor
how well you manage your blood sugar over time.

Get Started

This tool is not intended for women who are pregnant.

Start Over

Step:  of 

Today on WebMD

Diabetic tools
Symptoms, diagnosis, treatment, and more.
woman flexing muscles
10 strength training exercises.
 
Blood sugar test
12 practical tips.
Tom Hanks
Stars living with type 1 or type 2.
 
Woman serving fast food from window
Video
Can Vinegar Treat Diabetes
Video
 
Middle aged person
Tool
are battery operated toothbrushes really better
Video
 

Prediabetes How to Prevent Type 2 Diabetes
Article
type 2 diabetes
Slideshow
 
food fitness planner
Tool
Are You at Risk for Dupuytrens Contracture
Article