Skip to content

Diabetes Health Center

Iron Levels Linked to Type 2 Diabetes

Study Shows Threefold Increase in Risk in Women With Highest Levels of Iron in Blood
Font Size
A
A
A
By
WebMD Health News

Feb. 10, 2004 - Women with moderately high levels of iron in their blood appear to be at increased risk for type 2 diabetes. In a study involving more than 30,000 female nurses, women with the highest iron levels were three times as likely to develop the disease as women with the lowest levels.

A study investigator tells WebMD that more research is needed to determine if measuring iron in the blood can help predict diabetes risk. But he says it is not too soon for people to adopt dietary strategies designed to lower iron stores, like increasing fiber intake and decreasing red meat consumption.

The findings are published in the Feb. 11 issue of TheJournal of the American Medical Association.

"Many of these dietary interventions have been advocated for years to prevent heart disease," Harvard School of Public Health diabetes researcher Frank B. Hu, MD, PhD, tells WebMD. "This is really like using one stone for two birds."

Iron Was Strongly Predictive

People with a condition known as hemochromatosis, characterized by blood iron levels that are eight to 10 times higher than normal, are at increased risk for type 2 diabetes. In this study, Hu and colleagues wanted to find out if people with normal blood iron levels were also at increased risk.

The researchers evaluated blood samples from 32,826 healthy female nurses, taken between 1989 and 1990. During the next 10 years, roughly 700 of the women developed type 2 diabetes, and their blood iron levels were compared with a similar number of study participants who did not develop the disease.

Not surprisingly, the diabetic people tended to be heavier and more sedentary and were more likely to have a family history of the disease. They also had higher plasma concentrations of the inflammation marker C-reactive protein.

According to Hu, iron levels, as measured by the protein ferritin, were as strongly predictive of future diabetes as any known risk factor other than obesity. Those who had the highest levels of blood iron had the greatest risk of developing type 2 diabetes, even after adjusting for other factors that might increase the risk of the disease. The women in the study who developed type 2 diabetes ate more red and processed meats, ate less fiber, and consumed more calories overall than the non-diabetic women.

He adds that excess iron appears to contribute to diabetes risk by prompting the formation of free radicals, which, in turn, compromise insulin sensitivity.

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