Diabetes Self-Management Blog

The oral diabetes drug metformin may slow the aging process by mimicking the effects of a calorie-restricted diet, according to a new animal study from the United Kingdom. Metformin is believed to be the most commonly prescribed diabetes medicine in the world, with over 48 million prescriptions written in 2010 in the United States alone.

Calorie restriction has been shown, in some cases, to improve health and lengthen life in animals ranging from worms to rhesus monkeys. Similar effects have been noted with the use of metformin, but it has not been clear how the drug might help delay the aging process.

To determine how metformin slows aging, researchers looked at the effects of the medicine on C. elegans worms that were exposed to and colonized by E. coli bacteria — the relationship between these two organisms is similar to that which humans have with healthful bacteria in their gut. (Studies have found that “good” gut bacteria help their host digest and extract nutrients from food, and defects in these bacteria have been linked to metabolic conditions such as Type 2 diabetes and obesity.)

The results showed that the worms lived longer only when the E. coli strain they had been cultured with was sensitive to metformin. In these cases, the worms lived an average of six days longer than usual, equivalent to a third of their normal lifespan.

The researchers discovered that metformin slowed the aging process by altering the metabolism of the E. coli bacteria — specifically, by disrupting the bacteria’s ability to metabolize folate, a type of B vitamin, and methionine, a building block of protein — thereby limiting the nutrients available to the worm, mimicking the effects of a calorie-restricted diet.

When the team added excess sugar to the worms’ diets, however, the life-extending benefits of metformin were cancelled out, a finding that could be particularly relevant for determining how the medicine works in humans.

“We don’t know from this study whether metformin has any effect on human aging. The more interesting finding is the suggestion that drugs that alter bacteria in the gut could give us a new way of treating or preventing metabolic diseases like obesity and diabetes,” noted David Gems, PhD, who directed the research.

In a related study, this one conducted at the University of Montreal, investigators found that metformin may slow the aging process and cancer progression by reducing the production of inflammatory cytokines, a component of the immune system that helps fight infection. (When cytokines are overproduced, it leads to chronic inflammation that is involved in both the aging and cancer processes.) Specifically, metformin disrupted a protein that would typically trigger activation of the immune system.

To learn more about the research looking at metformin and C. elegans, read the article “How Diabetes Drug Delays Aging in Worms” or see the study’s abstract in the journal Cell. And to learn more about metformin, click here.


  1. fascinating study/comments.

    Metformin continues to amaze. More curious isthat metforming has to be acting as catalyst/signalling and no breakdown components have been discovered on metformin leaving the body as it came chemically.

    Posted by jim snell |
  2. I like this! It’s worth the side effects to help my battered immune system!

    Posted by Deb |
  3. Deb - What are your side effects? How does it help your immune system? What dose and form (regular or sustained release) are you using?


    Posted by Tintin |
  4. I hope those taking metformin are also taking B12. At any sign of dry skin or (upset stomach), I take methylcobalamin (activated B12) and the dry skin/upset stomach goes away.

    Posted by rmt |
  5. I had very serious to metformin after been taking it for several years. I really would like to go back to metformin instead having shots of insulin. Another great motivation for me is the cost!

    Posted by Rosa Beam |
  6. The side effect most people notice when first starting Metformin is weight loss. Not a lot, but more than before taking it. I take the lowest dosage at 1 500mg twice a day, but I know people who take higher doses have considerably more weight loss. Some GI symptoms are common when first starting Metformin, but those side effects diminish over a short period of time. My support groups diabetes nurse advises us to take probiotics which ties in with the information in the above article also.

    Posted by Pam Schmidt |
  7. After starting Metformin, I became deficient in several nutrients including vitamin D, several B vitamins, calcium, magnesium, and Iron. I now live on supplements.

    Posted by Joe |
  8. i take extra folate and beta-glucan—maybe my metformin is neutralizing thes supplements or delaying there action?????????I knew of metformins anti ageing action over 5 years ago…upon reading experiments at a small Calif. bio-tech firm—–This info did not originate where you say it did

    Posted by ted plottner |
  9. Why is it that all these studies are done in other countries. Where is all the money going for our research?????

    Posted by Laverne |
  10. Does this mean I should not be taking Folate supplements, in addition to B-12?

    Posted by Stuart |
  11. Yes, it would be good if someone could identify the appropriate supplements for people on Metformin as I think many would like to take supplements, but unsure of what exactly they should take and the appropriate dosing.

    Posted by Marsha |
  12. Talk to your LOCAL INDPENDENT P harmacist. They can tell you what supplements to take with the meds you are taking.
    Any pharmacist can tell you, the big box store Pharmacist don’t have time and are often not encouraged to take the time to tell you.

    Posted by Fern Byer |
  13. And that is because at independent pharmacies you are dealing with the owner, not true at the big box stores. And that means a lot to most patients.

    Posted by Valerie |

Post a Comment

Note: All comments are moderated and there may be a delay in the publication of your comment. Please be on-topic and appropriate. Do not disclose personal information. Be respectful of other posters. Only post information that is correct and true to your knowledge. When referencing information that is not based on personal experience, please provide links to your sources. All commenters are considered to be nonmedical professionals unless explicitly stated otherwise. Promotion of your own or someone else's business or competing site is not allowed: Sharing links to sites that are relevant to the topic at hand is permitted, but advertising is not. Once submitted, comments cannot be modified or deleted by their authors. Comments that don't follow the guidelines above may be deleted without warning. Such actions are at the sole discretion of DiabetesSelfManagement.com. Comments are moderated Monday through Friday by the editors of DiabetesSelfManagement.com. The moderators are employees of Madavor Media, LLC., and do not report any conflicts of interest. A privacy policy setting forth our policies regarding the collection, use, and disclosure of certain information relating to you and your use of this Web site can be found here. For more information, please read our Terms and Conditions.

Oral Medicines
Statins May Reduce Risk of Nerve Damage, Other Diabetes Complications (09/18/14)
New Metformin Combo Drug Approved for Type 2 Diabetes (08/13/14)
FDA Approves New Oral Drug for Type 2 Diabetes (08/07/14)
New SGLT Drugs Coming (07/23/14)

Diabetes Research
Can Grapefruit Juice Prevent Weight Gain, Increase Insulin Sensitivity? (10/16/14)
Low-Carb Diet Improves Quality of Life in Type 2 Diabetes (10/07/14)
Long Hours at Low-Income Jobs Linked to Increased Diabetes Risk (10/02/14)
Statins May Reduce Risk of Nerve Damage, Other Diabetes Complications (09/18/14)

Diabetes News
Can Grapefruit Juice Prevent Weight Gain, Increase Insulin Sensitivity? (10/16/14)
Low-Carb Diet Improves Quality of Life in Type 2 Diabetes (10/07/14)
Long Hours at Low-Income Jobs Linked to Increased Diabetes Risk (10/02/14)
New Weekly Type 2 Diabetes Drug Approved (09/26/14)

Diane Fennell
Take Part in the Big Blue Test! (10/15/14)
Can Grapefruit Juice Prevent Weight Gain, Increase Insulin Sensitivity? (10/16/14)
Low-Carb Diet Improves Quality of Life in Type 2 Diabetes (10/07/14)
Long Hours at Low-Income Jobs Linked to Increased Diabetes Risk (10/02/14)



Disclaimer of Medical Advice: You understand that the blog posts and comments to such blog posts (whether posted by us, our agents or bloggers, or by users) do not constitute medical advice or recommendation of any kind, and you should not rely on any information contained in such posts or comments to replace consultations with your qualified health care professionals to meet your individual needs. The opinions and other information contained in the blog posts and comments do not reflect the opinions or positions of the Site Proprietor.

Blood Glucose Self-Monitoring — Part 3: Smart Monitoring

10 Keys to Long-Term Weight Loss

Take Your Best Shot: Stay Up to Date on Vaccines

Complete table of contents
Subscription questions