#epigenome #diaryofaceo #dna #longevity #stevenbartlett #harvard #antiaging #genetics #lifestyle

Added: 2026-05-06

[00:00:00]Most people believe their genes determine their fate. If your parents had heart disease, you'll get heart disease. If your family ages badly, you'll age badly. A Harvard professor just dismantled that belief with science. Dr. David Sinclair, professor of genetics at Harvard Medical School, told Steven Bartlett on Diary of a CEO that DNA is not destiny.

[00:00:24]And he had the science to back it up.

[00:00:26]Here's the key insight. Your DNA, the actual genetic code you were born with, doesn't change significantly as you age.

[00:00:34]99.999% of it stays intact. What changes is the epigenome, the control system that tells your genes when to switch on and when to switch off.

[00:00:45]And unlike your DNA, your epigenome responds to your choices.

[00:00:50]Your diet, your sleep, your stress levels, your exercise, the environment you live in. These things don't just make you feel better. They literally change which of your genes are active and which are silenced.

[00:01:03]Sinclair points to identical twins as the clearest evidence. Two people with the same DNA who live very different lives, different diets, different exercise habits, different levels of stress, can show dramatically different rates of aging.

[00:01:19]Their DNA didn't change. Their epigenome did. The choices you make every day are literally writing your biological story.

[00:01:27]This is genuinely liberating. It means the version of old age you're picturing, looking at your parents, your grandparents, is not the version you're locked into.

[00:01:37]Your choices matter far more than your genes. Sinclair estimates that lifestyle factors account for the majority of variation in how people age.

[00:01:47]Your genetic code is the starting point.

[00:01:49]What you do with it is the story. And the most important thing, start now. The epigenome is responsive at any age. It's never too late to change the trajectory.

[00:02:00]Cells can be reset. The backup copy of your youth is still inside you. And every good choice you make today is literally updating your biological software for the better. Dr. David Sinclair on Diary of a CEO with Steven Bartlett.

[00:02:16]Full episode, link in bio. Follow for more.