Recent Blog Articles

The not-soy-good results

Updated: June 01, 2007

Soy protein and isoflavones haven't held up well in clinical trials, but there's still a place for soy in our diets.

Once the belle of the health-food ball, soy is looking a little forlorn these days. Claims that soy protein would protect us from heart disease now seem a little inflated. Studies have shown its effect on "bad" LDL cholesterol is pretty small, averaging less than a 5% decrease in most studies. Large amounts of soy protein — 50 grams a day, which is about half the amount of protein that Americans typically eat in a day — have had the same modest effect as smaller amounts.

To continue reading this article, you must log in.

Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.

  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »

I'd like to receive access to Harvard Health Online for only $4.99 a month.

Sign Me Up

Already a member? Login ».


As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.