More than 30 years ago, I (John McDougall, MD) performed and published the first study on the dietary treatment of breast cancer. Although it was a small study circulated by an obscure journal, this was an important beginning for the current medical thinking that a healthy diet should be fundamental therapy recommended by physicians for all cancer patients.
On February 13, 2015, the American Cancer Society published their recommendations that cancer survivors should follow "prudent diets," plant-based diets that are high in fruits, vegetables and unrefined grains while at the same time being low in red and processed meats, refined grains, and sugars. Its report states, "These diets are contrasted to 'Western' diets,' which have the opposite pattern and are heavy in meats, sweets, other processed foods, and dietary fat." They also recommend weight loss and exercise in order to prolong survival for people with cancer.