Using Your DNA to Optimize Health & Longevity
Joe Cohen — Precision Health Biohacker, CEO @ SelfDecode
Joe is a thriving entrepreneur, author and speaker. He's written hundreds of science posts, multiple books on improving health, and speaks at various health conferences. His own experience with severe health issues at very young age has prompted him towards a journey of self-experimentation and self-learning to improve his health-something that has since become known as “biohacking”. With thousands of experiments and Pubmed articles under his belt, Joe founded SelfHacked, the resource that was missing when he needed it. Nowadays, SelfHacked gets millions of monthly readers. Joe's mission is to help people gain access to the most up-to-date, unbiased, and science-based ways to optimize their health.
Joe Cohen advocates for a personalized approach to health and longevity, emphasizing that
The key to longevity is to personalize your approach to everything you are doing in order to prevent disease and optimize your health. You need to know your weaknesses so you can not only live longer, but also live healthier.
Summary
- Precision health requires integrating genetics, blood tests, and lifestyle data to identify specific weaknesses and move away from a one-size-fits-all approach to longevity.
- Accurate genetic predictions rely on polygenic risk scoring, which analyzes thousands of variants and ancestry data rather than focusing on single variants with over-inflated impacts.
- Mental health is a primary longevity factor; optimizing pathways like serotonin and BDNF can prevent physical health issues triggered by chronic stress and unhappiness.
- Mendelian randomization is a crucial tool for identifying causal links between lab markers and diseases, helping to distinguish true health risks from simple observational associations.
- Supplementation should be highly personalized, as certain nutrients like Vitamin E, B12, or Calcium can increase risks for heart disease or cancer depending on an individual’s genetic blueprint.
Article
Precision Health: Personalizing Longevity Through Genetics And Lab Biomarkers
At Biohacker Summit 2022 Helsinki, Joe Cohen Argued That Longevity Was Never Meant To Be One-Size-Fits-All
In Helsinki, at the Biohacker Summit 2022 Helsinki on Friday 3 June 2022, speaker Joe Cohen made a forceful case for a new model of health optimization, one that treated DNA not as destiny but as a blueprint to be interpreted alongside blood work, biomarkers and daily habits.
His presentation, *Using Your DNA to Optimize Health & Longevity*, unfolded at speed and with the urgency of a man who had lived the stakes himself. Cohen, entrepreneur, author and founder of SelfHacked, drew on his own history of severe health struggles and years of self-experimentation to argue that precision health had become essential for anyone serious about extending both lifespan and healthspan.
The central message was clear: personal biology matters. The future of longevity, Cohen suggested, belonged not to generic supplement stacks or fashionable routines copied from strangers online, but to strategies built around individual risk, inheritance and measurable physiology.
The End Of The One-Size-Fits-All Health Fantasy
Cohen returned repeatedly to a principle that has become almost heretical in parts of the wellness world: what works brilliantly for one person may work poorly, or even dangerously, for another.
“**If you try to just follow what someone else is doing, you are going to get the wrong results. They have a different genetic profile, so you need a personalized approach that identifies your priorities and focuses on them.**”
It was a rebuke to the culture of imitation that shadows modern biohacking. In its place, Cohen proposed a layered model of precision health, one that integrated three streams of evidence: genetics, lab tests and lifestyle or environmental data. Only by combining them, he argued, could people identify where they were vulnerable, what diseases they were predisposed to, and which interventions were worth pursuing.
Just as importantly, he warned against trying to optimize everything at once.
“**You need to pick your battles. Focus on one topic at a time in order to optimize it and get the best recommendations. If you have a health issue or a genetic risk, focus on that to make the most important impact.**”
It was practical advice, but also philosophical. Precision medicine, in Cohen’s telling, was not about perfecting the self in every dimension. It was about triage, about identifying the weak points that mattered most.
Why Single Genetic Variants Were Not Enough
For all the popular fascination with DNA reports and isolated gene mutations, Cohen stressed that meaningful prediction rarely came from a single variant. The effect of individual SNPs, he said, was usually small and often exaggerated.
Instead, he pointed to polygenic risk scoring as the more serious scientific tool. By examining thousands or even millions of variants, and by accounting for ancestry, polygenic models offered a more credible way to estimate future disease risk.
That distinction mattered. A single alarming result can send people spiralling into unnecessary fear. A robust polygenic score, by contrast, places risk in context, reducing false certainty and making prevention more targeted.
There were exceptions, he noted, citing high-impact genes such as APOE and BRCA. But for most common diseases, the story was more complex than one gene and one outcome.
Mental Health As The First Pillar Of Longevity
Perhaps the most arresting part of Cohen’s presentation was not about cholesterol or supplementation, but about happiness.
Drawing from his own history of mental health challenges, he described how genetic clues had helped him focus on serotonin pathways, BDNF and a hyperactive stress response. Those discoveries, he said, shaped interventions that transformed his wellbeing.
But beyond autobiography, he framed mental health as a foundational longevity issue.
“**Being happy is the number one longevity factor. People who are happy live longer and are healthier. If you are stressed all the time and unable to balance your mental health, that is going to weigh on your personal health.**”
In a field that often reduces ageing to molecules and metrics, this was a striking insistence on the biological burden of unhappiness. Chronic stress, Cohen argued, was not simply an emotional state. It was a physiological driver, capable of amplifying inflammation, destabilizing hormonal systems and accelerating decline.
His broader point was that precision health had to account for the brain as much as the body. Genetics could reveal tendencies, but the goal was not resignation. It was intervention.
“**Everything you do is changing your genetic expression all the time. You want to find out what your tendencies are so you can work in the best way to counteract negative tendencies or improve the positive ones.**”
Mendelian Randomization And The Search For What Truly Causes Disease
One of the presentation’s most rigorous sections centred on a tool still unfamiliar to much of the public: Mendelian randomization.
Cohen presented it as a way of cutting through the fog of observational research. Traditional studies may show that people with higher levels of a nutrient tend to be healthier, but such findings are often riddled with confounding variables. Perhaps those people also eat more vegetables, exercise more or smoke less. The nutrient itself may not be the reason.
Mendelian randomization, by contrast, looks at individuals who are genetically predisposed to have higher or lower levels of a biomarker. Because genes are assigned before birth, they can function like a natural experiment, helping researchers infer causality rather than mere association.
The implications, Cohen suggested, were profound. This approach made it possible to distinguish markers that simply tracked with health from those that actively shaped disease risk.
The Biomarkers That Mattered Most
Some of Cohen’s examples confirmed conventional wisdom, but with stronger causal backing than many wellness claims can muster.
Higher genetically predicted glucose, he said, was linked to increased risk of diabetes, heart disease, Alzheimer’s disease and diabetic complications. Elevated blood pressure was associated with stroke, heart disease, cognitive impairment, type 2 diabetes and reduced longevity.
These were not exotic findings. They were, in a sense, a reminder that the basics still mattered. A cutting-edge genetics talk ultimately reinforced the urgency of controlling blood sugar and blood pressure through daily behaviour.
He also highlighted LDL cholesterol as one of the most solidly evidenced causal factors in modern medicine. Drawing on Mendelian randomization, clinical trials and observational data, Cohen argued that high LDL was decisively linked to heart disease and shorter lifespan. HDL, by contrast, may have been given too much credit, with less cardiovascular protection than once assumed.
In a culture eager for contrarian takes, it was a noteworthy moment of scientific restraint. Some old warnings, he implied, remained true.
The Risks Hidden Inside Popular Supplements
Where the talk grew especially provocative was in its treatment of vitamins and minerals often regarded as harmless, or inherently beneficial.
Cohen’s argument was not anti-supplement. It was anti-universalism. Nutrients, he suggested, can help in one context and harm in another, depending on the person, the dose and the risk profile.
Vitamin C, he noted, appeared causally linked to better heart health and lower all-cause mortality. But other supplements came with sharper edges. Higher genetically predicted vitamin B12 was associated with increased lung cancer risk. Vitamin E, often marketed as protective, had evidence linking it to cardiovascular events. Calcium supplementation, too, raised concerns around heart disease and stroke. Elevated iron levels were tied to shorter lifespan. Higher vitamin K levels may increase the risk of stroke and heart attack. Selenium might worsen blood sugar regulation and insulin resistance in some individuals.
“**Longevity is not just about what you are taking; it is also about what you are not taking. You need to be strategic and get your priorities straight to focus your plan on what works for your specific genetic profile.**”
That line captured the spirit of the talk. Wellness, as Cohen framed it, was not accumulation. It was discrimination. More was not necessarily better. Better meant better matched.
A Blueprint, Not A Sentence
Cohen was careful to insist that genes were not fixed commands. The genome, in his account, was a map of tendencies, not a prison.
He described how understanding one’s genetic blueprint could guide changes in diet, supplementation and environmental exposure. He gave examples from his own life, including sensitivity to plastics and fish dioxins, food reactivity and cholesterol responses shaped by diet composition. Resistant starch, he said, had helped him by boosting butyrate and easing food sensitivities. Other supports, from thiamine to shilajit and curcumin, had been useful in his own case, though he stressed that they were not universally transferable.
That caveat may have been the most responsible feature of the presentation. In a commercial ecosystem built on certainty, Cohen repeatedly returned to uncertainty, complexity and individual variation.
Precision Health’s Promise And Its Burden
What emerged from Joe Cohen’s appearance at Biohacker Summit 2022 Helsinki was not a magic formula for living longer. It was something more difficult and more honest: a demand for disciplined personalization.
Precision health, as he described it, asked people to abandon simplistic narratives. It required them to look at ancestry-aware genetic risk, causal biomarker data and the realities of their own mental and physical history. It urged them to act strategically, not performatively.
And beneath the technical language of polygenic scores and Mendelian randomization lay a remarkably human thesis. The longest life, Cohen suggested, may not belong to the person taking the most supplements or chasing the latest longevity craze. It may belong to the person who understands their own biology well enough to intervene wisely, and who protects the emotional conditions that make health worth extending in the first place.
Part of Biohacker Summit 2022 Helsinki