I entitled this book "Immortal Mitochondria" because thousands of them in every one of my cells with their own genome make me live, grow, and function as a person with power to feel and heal. I inherited this old eukaryotic symbiont from my maternal mothers may be a 1000 years ago and there may me a 1000 or more males and females out there with mitochondrial genome similar to mine. This biological truth relates to our daily life in terms of foods we eat for energy and our vitality, our electro-magnetic life processes, life span, aging and death. As mitochondria do all this, they fuse, split, change shape, and get destroyed under their own specification of purposeful quality control. I wish to tell my readers that the mitochondrial genome talks to our nuclear genome regularly and caring for it is critical to our health and longevity. The first chapter is about biochemistry of chemical energy production from glucose, the second is about "how, how often, and what kind" of foods that we should eat, the third is about vital signs and organ failures due to failing mitochondria, and the fourth is about diseases controlled my mitochondrial genes. The fifth chapter is an integrated summation of all. It describes the evolution of and power production by mitochondria, mitochondrial health as it relates to aging, and the e ects of how we choose to live on the health of mitochondria. I should emphasize that "How we choose to live" includes exercise, yoga, meditation, mindfulness, acupuncture, self-message, and even the way we use our mind. We live by 3,750 million of these nanomagnets in our cells and our life is all about the life of mitochondria within us. We can live long and well only by healthy mitochondria. We must help them remain immortal by good foods.