Best-selling author Kathy Freston has long been a proponent for healthy living and conscious eating. Now, through a series of interviews with doctors and nutritionists, Freston discusses the latest research that points to the benefits of a plant-based diet.
There is hope. Real, scientifically valid, practical hope. This is what I am learning from a few highly esteemed doctors and nutrition scientists who say there is much to be done with diet when it comes to cancer. What we eat very much affects the state of our health, so if we add in nutrition that supports healing while cutting out foods that create havoc, we can really change the course of our lives for the better. Here's the bottom line: Animal protein seems to greatly contribute to diseases of nearly every type, including cancer, and a plant-based (vegan) diet is not only good insofar as prevention, but it could also be curative.
I've asked Dr. T. Colin Campbell, professor emeritus of Cornell University and author of the groundbreaking The China Study to explain a little about how and why nutrition (both good and bad) affects cancer in our bodies. Campbell's work is regarded by many as the definitive epidemiological examination of the relationship between diet and disease. He has received more than 70 grant years of peer-reviewed research (the gold standard of research), much of it from the National Institutes of Health (NIH), and he has authored more than 300 research papers. He grew up on a dairy farm believing in the great health value of animal protein in the American diet and set out in his career to investigate how to produce more and better animal protein. Troublesome to his preconceived hypothesis of the goodness of dairy, Campbell kept running up against results that consistently proved an emerging and comprehensive truth: that animal protein is disastrous to human health.
Through a variety of experimental study designs, epidemiological evidence and observation of real-life conditions that had rational, biological explanations, Dr. Campbell has made a direct and powerful correlation between cancer and animal protein.
He says that at various times throughout our lives, we all have cancer cells that will pop up in our bodies, but what "feeds" the cancer and fortifies it is, among other things, animal protein. Why is that? Because animal protein (meat, dairy and eggs) alters the mix of hormones and modifies important enzyme activities, causes inflammation and cell proliferation and creates an acidic atmosphere in the body—all of which create and ideal environment for cancer to thrive.
On the other hand, when you eat a plant-based (vegan) diet, you are getting the antioxidants inherent in vegetables and fruits that are critical to neutralizing cancer-causing free radicals in the body and fiber that acts like a scrub brush going through your body. A varied, plant-based diet is a protective diet—sufficient in amino acids for protein needs; high in fiber, antioxidants, vitamins and minerals; and low in saturated fats.
How can you put nutrition to work for you now?
Although research on the effect of nutrition on cancer is ongoing, some experts are putting nutrition to work right now. One of these, Dr. Neal Barnard, heads The Cancer Project, which offers a series of nutrition and cooking classes in cities across the United States (The Cancer Project) for people who have been diagnosed with cancer and for people hoping to prevent it. The classes are based on studies showing that plant-based diets not only reduce the risk that cancer will start; they also improve survival after diagnosis.
What's the evidence? For starters, many studies show that women who are overweight are at greater risk for succumbing to breast cancer. Trimming away extra weight helps them survive. Plant-based diets make weight control much easier.
But the evidence goes further. The Women's Intervention Nutrition Study, which included 2,437 postmenopausal women who had previously been treated for breast cancer, tested whether a low-fat diet could reduce the risk that cancer might recur. And it did. The diet change cut recurrence risk by about 25 percent.
Adding physical exercise helps too. In the Women's Healthy Eating and Living study, which included approximately 3,000 women, all of whom had been treated for breast cancer, those who had at least five daily servings of fruits and vegetables and averaged 30 minutes of walking each day had roughly half the mortality risk, compared with women who ate fewer vegetables and fruits or who were less active.
Diet also makes a huge difference for men. Dr. Dean Ornish, who had already shown the ability of a low-fat vegetarian diet, along with other lifestyle measures, to reverse heart disease, tested a similar diet for men with prostate cancer. To track their progress, he checked a blood test called prostate-specific antigen (a rapidly rising PSA is a sign of advancing cancer). Dr. Ornish showed that, on average, men who avoided animal products actually had a drop in their PSA levels, meaning their cancer was not advancing and might actually be retreating. Meanwhile, men in a control group that made no diet changes continued to worsen.
Putting these studies together, the healthiest combination appears to be to cut out fatty foods—especially animal products—boost vegetables and fruits and lace up your sneakers.
I realize this is a lot of information, and it may be contrary to the very diet you are used to eating. But with this knowledge under your belt, it should be easier and more exciting to upgrade your diet knowing the profound effect it can have; it also gives you more control over the future of your health, knowing that what you eat really does make a difference. If you aren't sick right now, lean into the change. Give up one animal at a time and substitute veggie proteins—soy, legumes, beans, faux meats—for animal ones, until you are comfortable with your new way of eating and living. If you have been diagnosed with cancer, you might want to check in with CancerProject.org for recipes and support and leap (or lean vigorously!) into this new and joyful way of eating!