 In my research into reversing aging video, I highlighted Dean Ornish's landmark study, showing that a low-fat, whole foods, plant-based diet, high in vegetables, fruits, whole grains, beans, along with walking, stress management, and support, could not only reverse heart disease, open up arteries without drugs and surgery, and potentially reverse the progression of early-stage prostate cancer, but was the first intervention ever shown to increase telomerase activity, the enzyme that builds and maintains these caps at the tips of our chromosomes called telomeres, which appear to slow the aging of our cells. Yes, this new finding was exciting, and should encourage people to adopt a healthy lifestyle in order to avoid or combat cancer and age-related diseases, but was it the diet, the exercise, or the stress management? That's what researchers have been trying to tease out in the six years since the study was published. Let's look at stress first. In the film The Holiday, Cameron Diaz exclaimed, severe stress caused the DNA in our cells to shrink until they can no longer replicate. Did Hollywood get the science right? Do people who are stressed have shorter telomeres? To answer that question, researchers measured the telomere lengths in mothers of chronically ill children. What could be more stressful than that? The longer a woman had spent being the main carer of her ill child, the shorter were her telomeres. The extra telomere shortening in these stressed mothers was equivalent to that caused by at least a decade of aging. We see the same thing in caregivers of Alzheimer's patients, and those suffering severe work-related exhaustion. Even those abused as children may grow up with shorter telomeres. Not much we can do about our past, but if we manage our stress, can we grow some of our telomeres back? Well, if you go off to a meditation retreat and meditate for 500 hours, you can indeed boost your telomerase activity. 600 hours of meditation may be beneficial as well. But come on, there's got to be a quicker fix, and this exciting new study delivered. Caregivers of family members with dementia randomized to just 12 minutes of daily meditation for 8 weeks, so just about 10 hours in total, experienced significant benefit. Better mental and psychological function accompanied by an increase in telomerase activity suggesting improvement in stress-induced cellular aging. I'll cover diet and exercise next.