START A PETITION 27,000,000 members: the world's largest community for good

Eating More Meat Than Veggies? For Prostate Cancer, It Matters

It is now 8 years since the famous Ornish study was published, suggesting that 12 months on a strictly plant-based diet could reverse the progression of prostate cancer. For those unfamiliar with that landmark Ornish study, see  Cancer Reversal Through Diet?, which the Pritikin Foundation followed up on with Ex Vivo Cancer Proliferation Bioassay.

Wait a second. How were they able to get a group of older men to go vegan for a year? They home delivered prepared meals to their doors, I guess figuring men are so lazy they’ll just eat whatever is put in front of them.

But what about out in the real world? Realizing that you can’t even get most men with cancer to eat a measly five servings of fruits and veggies, researchers settled on just trying to change their A to V ratio—the ratio of animal to vegetable proteins—and indeed were successful in cutting this ratio by at least half, from about 2 to 1 animal to plant, to kind of half vegan, 1 to 1.

How’d they do? Their cancer appeared to slow down. The average PSA doubling time (an estimate of how fast the tumor may be doubling in size) in the “half vegan” group slowed from 21 months to 58 months. So the cancer kept growing, but with a part-time plant-based diet they were able to slow down the tumor’s expansion. What Ornish got, though, was an apparent reversal in cancer growth—the PSA didn’t just rise slower, it trended down, which could be an indication of tumor shrinkage. So the ideal A to V ratio may be closer to zero.

If there’s just no way grandpa’s going vegan, and we just have half-measures, which might be the worst A and the best V? Eggs and poultry may be the worst, respectively doubling and potentially quadrupling the risk of cancer progression in a study out of Harvard. Twice the risk eating less than a single egg a day and up to quadruple the risk eating less than a single serving of chicken or turkey.

And if you could only add one thing to your diet, what would it be? Cruciferous vegetables. Less than a single serving a day of either broccoli, Brussels sprouts, cabbage, cauliflower, or kale may cut the risk of cancer progression (defined as the cancer coming back, spreading to the bone, or death) by more than half.

The animal to plant ratio might be useful for cancer prevention as well. For example, in the largest study ever performed on diet and bladder cancer, just a 3% increase in the consumption of animal protein was associated with a 15% higher risk of bladder cancer, whereas a 2% increase in plant protein intake was associated with a 23% lower risk. Even little changes in our diets can have significant effects.

What else might help men with prostate cancer? See Flaxseed vs. Prostate Cancer and Saturated Fat & Cancer Progression. What about preventing it in the first place? See:

Poultry and eggs may be related to cancer risk in a variety of ways:

Crucifers may also help with other cancers. See:

Breast cancer is highlighted in my video Breast Cancer Survival Vegetable.

In health,
Michael Greger, M.D.

PS: If you haven’t yet, you can subscribe to my free videos here and watch my live year-in-review presentations Uprooting the Leading Causes of Death and More Than an Apple a Day.

Poultry and Paralysis
Bladder Infections from Eating Chicken
Why Is Selling Salmonella-Tainted Chicken Still Legal?

Read more: Health, Cancer, Diet & Nutrition, Eating for Health, General Health, Men's Health, Natural Remedies, Vegan, Videos, , , ,

have you shared this story yet?

go ahead, give it a little love

Dr. Michael Greger

A founding member of the American College of Lifestyle Medicine, Michael Greger, M.D., is a physician, author, and internationally recognized speaker on nutrition, food safety, and public health issues. Currently Dr. Greger serves as the Director of Public Health and Animal Agriculture at The Humane Society of the United States. Hundreds of his nutrition videos are freely available at


+ add your own
1:59AM PST on Feb 19, 2014

Thank you

11:01AM PST on Feb 14, 2014


4:34AM PST on Feb 13, 2014

I guess everyone as their choice. It's almost 2 weeks I have not eaten any meat including chicken, and I am proud to call myself vegetarian. I don't miss it, when I go to the store I pass the meat section and it does nothing for me.

9:11AM PST on Feb 12, 2014

Thanks for sharing

2:47AM PST on Feb 11, 2014


7:31AM PST on Feb 10, 2014

What I have found is that most folks just plain do not want to HEAR anything negative about the way they are nourishing their body. I have relatives that think I am a bit strange, just because I do pay attention to my nutrition. But they just don't seem to even want to hear anything negative about their own eating habits. And if a "convenience" food states that it has added vitamins, well--there ya go. It's all good, according to one of my family members. I try to add little nuggets of information when I can, but if there is resistance, there's isn't much I can do at this time. Sad!

8:18AM PST on Feb 8, 2014

Not ALL men are lazy ! what a broad-brush statement!
Who paid the study, that should be the first question to be asked. Then you know what they want to sell you... or in which direction they want you to act.

12:36AM PST on Feb 8, 2014


5:14PM PST on Feb 7, 2014


2:00PM PST on Feb 7, 2014

Fruits and vegetables are the way to go. Meat and dairy products harm more than help. Vegans live on average 7 to 9 years longer than those eating meat and dairy. It's a win-win situation for people and animals. The people are healthier and the animals don't have to die.

add your comment

Disclaimer: The views expressed above are solely those of the author and may not reflect those of
Care2, Inc., its employees or advertisers.

people are talking

The golden rule.

LIFE is full of choices...certainly in one`s diet....thanks for offering some ideas..... BIG on the…


Select names from your address book   |   Help

We hate spam. We do not sell or share the email addresses you provide.

site feedback


Problem on this page? Briefly let us know what isn't working for you and we'll try to make it right!