How To Protect Your Mitochondria From Today’s Toxic World | Dr. Daria Mochly-Rosen

Regular exercise, even starting later in life, significantly improves mitochondrial health and overall well-being by increasing mitochondrial numbers, quality, and beneficial signaling molecules.

• Exercise, even starting in old age, dramatically improves mitochondrial quality and function.

• Mitochondria release beneficial peptides like humanin and use reactive oxygen species as signals for renewal.

• Both strength and endurance training are crucial for maximizing mitochondrial health and overall well-being.

Exercising at any age, including starting in one's 70s, can lead to substantial improvements in mitochondrial function and overall body health. Mitochondria adapt to exercise by releasing beneficial peptides like humanin and generating reactive oxygen species that signal for new mitochondrial growth and removal of damaged ones. Both strength and endurance training are crucial for optimal mitochondrial health.

Benefits of Exercise on Mitochondria

• 00:00:05 Exercising can significantly improve the quality and function of mitochondria, even in old age, with studies showing major improvements in muscle mitochondria for those who begin an exercise regimen. It's never too late to start, and even individuals in their 70s can experience enhanced mitochondrial function, leading to better overall health.

• 00:01:25 Non-cyclists who began an exercise regimen for a few months caught up significantly to lifelong cyclists in terms of mitochondrial quality, demonstrating the body's remarkable ability to adapt. Regular physical activity, even if started later in life, can greatly benefit mitochondria, brain health, and the entire body's well-being.

Mitochondrial Signaling and Humanin

• 00:03:07 During exercise, mitochondria in muscles release 'treats' like myokines and small peptides, which benefit the entire body. One key peptide, humanin, discovered to be produced by mitochondrial DNA, is released during exercise and impacts the brain. Variations in humanin sequences correlate with longevity and susceptibility to conditions like Alzheimer's disease.

• 00:04:47 Normal humanin, which most people possess, is beneficial for the brain when exercising, suggesting exercise protects cognitive function. This discovery also opens avenues for medical intervention, exploring whether synthetic humanin could help patients with less functional humanin.

Reactive Oxygen Species (ROS) as Signals

• 00:05:20 Exercise causes mitochondria to work faster, leading to a small leakage of electrons and the generation of reactive oxygen species (ROS), often perceived negatively. However, this controlled generation of ROS is beneficial, acting as a signal to the nucleus to synthesize more mitochondria and replace damaged ones, preparing the body for future exertion.

• 00:06:12 Small levels of reactive oxygen species signal both within and outside the cell, promoting mitochondrial renewal and adaptation. While excessive ROS is harmful, the modest increase during exercise is a crucial adaptive mechanism, ensuring the continuous replenishment of healthy mitochondria.

Strength vs. Endurance Training

• 00:07:16 Both strength and endurance training are vital for mitochondrial health, and combining them yields better results than either alone. Strength training increases muscle mass, indirectly leading to more mitochondria, while endurance exercise increases functional and healthy mitochondria by promoting a process called mitophagy, which removes damaged mitochondria and signals for new growth.

• 00:08:35 Endurance exercise enhances the renewal of mitochondria by increasing mitophagy, where damaged mitochondria are removed. Strength training builds muscle mass, thus increasing the number of cells that house mitochondria. Engaging in both types of exercise ensures a comprehensive approach to optimizing mitochondrial function and overall physical health.