Mitochondria are our energy producing factories in our muscle cells and other cells, which give us energy and stamina. On July 4, 2017 I posted an article on my Dr Lindy MD Facebook page from NIH.Gov: Role of Mitochondrial Dysfunction in Cancer Progression. 
Basically, junk DNA causes mitochondrial dysfunction and allows cancer to form and progress. Deregulated cellular energetics increases blood sugar and reduces mitochondrial respiration even in the presence of oxygen. As Dr. Joseph Mercola says in his book, Fat for Fuel, changing your diet is the single most powerful thing you can do to improve the health of your mitochondria.
This includes being mindful of sugar and alcohol, both of which are toxic to mitochondria. Electromagnetic field sources, including some cell phones can also disrupt mitochondrial function. It’s important for each of us to learn to support our mitochondria to improve our health; foods, exercise, calorie restriction help.
There is so much more to learn about these tiny powerhouses inside of us.
Dr Lindy MD is announcing a new blog series, Mitochondria Matters, exploring the ways in which mitochondria affect our bodies, health and lives. Watch this space for further exploration of these amazing organelles.
Mitochondria Matters – September 7, 2017. Author: Linda Burnham, MD
 Hsu C-C, Tseng L-M, Lee H-C. Role of mitochondrial dysfunction in cancer progression. Experimental Biology and Medicine. 2016;241(12):1281-1295. doi:10.1177/1535370216641787.
 Mercola J. Fat for fuel: a revolutionary diet to combat cancer, boost brain power, and increase your energy. Carlsbad, CA: Hay House, Inc.; 2017:237.