Doctor's Note

Check out these videos on breast cancer risk:
Can Flax Seeds Help Prevent Breast Cancer?
BRCA Breast Cancer Genes and Soy
Breast Cancer and Constipation
Cholesterol Feeds Breast Cancer Cells
Statin Cholesterol Drugs and Invasive Breast Cancer

And check out my other videos on breast cancer

For more context, also see my associated blog posts: Breast Cancer and DietTreadmill Desks: Stand Up For Health; and Mushrooms for Breast Cancer Prevention.

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  • Michael Greger M.D.

    Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. And check out the other videos on breast cancer. Also, there are 1,449 other subjects covered in the rest of my videos–please feel free to explore them as well!

  • sonarlily

    What are my choices for moderately intense exercise?

    • Anya

      As mentioned in the video, fast-walking, hiking, & biking are all forms of moderately intense activity, as well as light jogging and leisurely swimming. A good indication that you are working out at a moderate level is a noticeable increase in heart & breathing rates – you should be able to talk, but you shouldn’t be able to sing. Regular exercise is definitely beneficial for both the body and mind!(see

  • Michael Greger M.D.

    Also be sure to check out my associated blog post Breast Cancer and Diet!

  • shoot–bad news for me. Will try to do better! As a teacher, I often work till 7:00 pm. Breast cancer is in my maternal side-mom (passed form it) her sister and her daughter (my cousin) -survived, but cousin ended up with liver cancer later that took her. Made the switch to plant based eating—Food for thought here….Maybe time to actually use my elliptical machine!

  • Surprise, surprise…I’ve never heard anybody else say that – ever! (except maybe Ruth Heidrich) Sounds like it’s time for a major lifestyle change!

  • M

    Two of the best exercise methods require much less than 60 minutes: For optimal strength, muscle, & bone health, an HIT session can be completed in 20 minutes. For conditioning & fat loss, a Tabata workout is over in 4 minutes. Anything more is counterproductive.

  • judy

    how does one hour of daily exercise decrease the risk of breast cancer ?

    • Guest

      I am not a medical professional (although actually most of them don’t know this kind of stuff anyway!), just a health nut who reads a lot. But from what I gather, it works via various mechanisms. Exercise results in lower levels of circulating hormones, so it reduces risk of the hormone-driven cancers. I’m not sure if the hormone levels are reduced because they’re excreted faster or sweated out, or if your body makes less of them, or what, but they’re lower. Exercise also increases telomere length, which reduces the chance of DNA mutating in the first place. Plus sweat releases toxins from the body, so they’re not in you to cause cancer. Exercise also increases glucose uptake by muscles, which lowers levels in your blood, which deprives any growing tumors of a food source. There might be other ways it works, too.

  • Guest

    What is the exercise time needed if some or all of it is intense, rather than moderate?