Dr. Kumar’s Take:
This editorial proposes that traits that once helped human ancestors survive, like high cholesterol levels or better salt retention, may now be working against people today. The authors argue that these genetic adaptations, once useful in fighting off infections or surviving heat and dehydration, are mismatched with today’s lifestyle of overnutrition and processed food. It is a hypothesis, not a tested result, but it offers one explanation for the rise in heart disease, high blood pressure, and stroke.
Actionable tip: If heart disease runs in your family, it may not just be diet, your genes might be playing a role. But healthy lifestyle choices like reducing processed foods, staying active, and managing stress can help offset these inherited risks.
Key Takeaways:
✔ High cholesterol may have helped early humans fight infection, but now raises heart disease risk.
✔ Salt-retaining genes in African ancestry may have helped people survive dehydration, but now raise blood pressure.
✔ The shift from survival advantage to modern disease is a case of evolutionary mismatch.
Brief Summary:
This editorial presents a hypothesis about how natural selection may have shaped human genes in ways that increase modern-day risks for high cholesterol and high blood pressure. Traits like salt retention and high immune activity were likely beneficial during times of frequent infection and limited food. Today, however, those same traits may contribute to chronic conditions like heart disease and stroke when combined with a modern diet high in fat and sodium.
Study Design:
This was an editorial published in Physiological Research in 2018 by researchers from the Czech Academy of Sciences and the Institute of Clinical and Experimental Medicine in Prague. They drew on historical, genetic, and epidemiological data to propose that many cardiovascular risk factors are the result of ancient adaptations that became harmful in today’s environment.
Key Points of the Hypothesis:
- Pro-inflammatory immune cells in fat tissue were linked to high cholesterol, especially non-HDL cholesterol.
- Infections were the main killers in the past, so the authors suggest that higher cholesterol and more immune cells may have helped survival.
- A similar hypothesis proposes that harsh selection during transatlantic slave transport favored people who retained sodium well, which may help explain frequent hypertension in African Americans today.
- Familial hypercholesterolemia appears to have been an advantage in the 19th century, when infection deaths were high, and a disadvantage now that cardiovascular deaths dominate.
- Today, those same traits increase risk for heart attacks and strokes.
The Evolutionary Story Behind Cholesterol and Blood Pressure
Human ancestors faced constant exposure to deadly infections, extreme climates, and limited nutrition. Traits like:
- Higher cholesterol (linked to more inflammatory immune cells and possibly a better ability to fight infection),
- Stronger immune response (more inflammatory macrophages),
- Better sodium retention (to prevent dehydration),
…may have been valuable for survival, and the authors propose that natural selection made them more common. But now, in an environment of excess calories, processed food, and sedentary lifestyles, they’ve become liabilities, contributing to the rise in chronic diseases like heart disease and hypertension.
This paper supports the broader theory of evolutionary mismatch, where genes adapted for one environment become harmful in another. For more on this topic, check out related posts:
Related Studies and Research
Inflammation and Cardiovascular Disease Reviews how inflammation functions as a central driver of heart disease, potentially shaped by evolutionary pressures.
Inflammation, Cholesterol, and Heart Disease Explores how lipid levels and inflammatory markers interact to influence cardiovascular outcomes.
LDL-C and Mortality in the Elderly Investigates whether standard lipid targets apply to older adults, considering genetic and inflammatory variation.
Frequently Asked Questions
Why would high cholesterol ever be helpful?
Infections used to be the biggest threat to survival. Higher cholesterol may have helped build stronger immune defenses, particularly in fat tissue.
Why is hypertension more common in African Americans?
Genetic traits that helped retain salt and fluids during hot climates or dehydration may now raise blood pressure when salt is plentiful in the modern diet.
Can you change your genes?
You can’t change your DNA, but lifestyle can change how genes are expressed. Regular exercise, a healthy diet, and stress management can greatly reduce risk, even if the genes are there.
What is evolutionary mismatch?
It means a trait that was helpful in the ancestral past is now harmful because the environment has changed too quickly for evolution to keep up.
Conclusion
This editorial suggests that modern health issues like high cholesterol and blood pressure may not be just about poor choices; they may also be part of human evolutionary history. The past cannot be changed, but understanding the body better and making lifestyle choices that support heart health still matter in today’s world.
