A seven-year study of 992 patients with colon cancer that had already spread to their bellies had a 42 percent reduction in death rate and a 31 percent reduction in recurrence of their cancer when they:
• avoided overweight
• exercised regularly (one hour of walking per day)
• ate a diet rich in whole grains, vegetables and fruits, and low in red meat and processed meat, and
• restricted alcohol.
(Abstract 10006, 2017 Annual Meeting of the American Society of Clinical Oncologists, May 17, 2017).

A review of the world's literature showed that the lifestyle changes listed above can help to prolong the lives of patients who have already been diagnosed with cancer (Acta Oncol, Feb 2011;50(2):167-78), causing the World Cancer Research Fund, the American Institute for Cancer Research and the American Cancer Society to recommend that cancer patients follow a largely plant-based diet with limited consumption of meat, restriction of alcohol, maintenance of a healthy weight and a regular exercise program (Maturitas, May 19, 2017).

Obesity Increases Risk of Death in Cancer Survivors
The American Cancer Society has reported that obesity was linked to increased death risk from the most common forms of cancer in men (prostate, kidney, colorectal, esophagus, stomach, pancreas and liver) and women (colorectal, ovary, breast, cervical, kidney and uterus).

Obesity turns on your immunity and keeps it active to cause inflammation that is associated with increased death rates after cancer diagnosis. For a detailed discussion see How Excess Fat Can Spread Cancer. I believe that the most effective and easiest way to lose weight and keep it off is Intermittent Fasting