The people who live the longest have cholesterol levels your guidelines would call “high.” Here’s what the largest mortality studies in the world actually show — and why you won’t hear about it in your annual physical.
In the last post, I showed you my own lipid panel and walked through why the “high cholesterol” flag was a misread. Now I want to pull back and answer the deeper question: if elevated cholesterol isn’t the cardiovascular threat we’ve been told it is, what does the actual mortality data show?
The answer is the part of cholesterol science that almost never reaches the patient. It’s not hidden in obscure journals. It’s not the work of fringe contrarians. It’s published in The Lancet, in Scientific Reports, in The Journal of Evaluation in Clinical Practice. It involves millions of participants across multiple continents over decades of follow-up. And it says, consistently, that the people with the lowest cholesterol levels die at higher rates than the people with moderately elevated cholesterol — especially as we age, and especially in women.
This is the data your annual physical doesn’t reference. Let me walk you through it.
The 12.8 million person study
In 2019, a Korean research team published in Scientific Reports the results of a prospective cohort study following 12,815,006 adults from 2001 through 2013. During follow-up, 694,423 people died. The researchers tracked total cholesterol against all-cause mortality across every age group and both sexes.
What they found was a U-shaped curve. Not a linear “more cholesterol equals more death” relationship. A U. Mortality was highest at very low cholesterol levels, dropped to a nadir, and then rose modestly at very high levels.
The breakdown by age is where it gets striking. For people with total cholesterol under 200 mg/dL, every 1 mmol/L (39 mg/dL) increase decreased mortality by 13% (ages 18-34), 27% (35-44), 34% (45-54), 31% (55-64), 20% (65-74), and 13% (75-99). For total cholesterol above 200 mg/dL, every 1 mmol/L increase increased mortality by 14%, 13%, 8%, 7%, 6%, and 3% across the same age groups.
Read that again. Going from low cholesterol up toward 200 dramatically decreased death rates. Going above 200 only modestly increased them. And the effect of “high” cholesterol shrank with age, until in the oldest group the increase was a barely-detectable 3% per 39 mg/dL.
When the same team followed up specifically on the oldest old (75-99), they found the total cholesterol range associated with the lowest mortality risk was 210 to 249 mg/dL — well above the “desirable” target of <200 that every American is told to hit.
This is the largest study of its kind ever conducted. And the answer it produced was the opposite of the
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