The video above is from 2016. It is a 30-minute interview with 81-year old Ruth Heidrich.
Another great video by Ruth Heidrich is her 50-Minute Talk in 2005 in which she narrates her life story. Her talk is both funny and informative. She appeared in the documentary Forks Over Knives.
Ruth Heidrich pursued her career as a military logistician. In 1982, when she was 47 when she was diagnosed with breast cancer. She was taken by surprise. She'd been a runner for 14 years, had run 3 marathons and ate what she believed was a very healthy diet — lots of chicken, fish and low-fat dairy.
While recovering from breast cancer surgery, she chanced upon a 2-line advertisement in the newspaper seeking breast cancer patients to participate in a clinical study. Ruth immediately called and was connected to Dr John McDougall who convinced her to switch to a low fat plant-based diet. A key factor that helped Ruth get convinced was the mountain of data that Dr McDougall presented from research papers. Dr McDougall continues to write many articles at his website.
While Ruth was pursuing a plant based diet, she also decided to train for the Ironman Triathlon. She added swimming and biking to her daily runs. Since 1982, Ruth has completed the Ironman 6 times, run 67 marathons and has won over 800 racing trophies.
More details of Ruth's journey are available this article. Her 50-Minute Talk in 2005 is also awesome.
Ruth has also written books on running and senior fitness: check out her Author page at Amazon.