Large-Scale Multinational Study Identifies U-Shaped Mortality Risk Linked to Low Cholesterol Levels in Chinese Adults

New research identifies a U-shaped link between cholesterol and mortality in Chinese adults, showing that very low LDL-C may increase cancer and stroke risks.

By: AXL Media

Published: Apr 29, 2026, 8:37 AM EDT

Source: Information for this report was sourced from Higher Education Press

Re-evaluating the Conventional "Lower Is Better" Paradigm

For decades, clinical guidelines have prioritized the aggressive reduction of low-density lipoprotein cholesterol (LDL-C) as the primary strategy for preventing atherosclerotic cardiovascular disease. However, new research from Fuwai Hospital and the Chinese Academy of Medical Sciences suggests that this approach may require significant refinement. By analyzing 163,115 Chinese adults and 317,305 UK adults over a ten-year period, investigators discovered that extremely low cholesterol levels are not universally beneficial. Instead, the data reveals a "metabolic sweet spot" where mortality risk is minimized, suggesting that maintaining cholesterol within a specific range is more protective than driving it to the lowest possible concentrations.

The U-Shaped Association and Hidden Risks of Low LDL-C

The most striking finding for the Chinese cohort was the emergence of a U-shaped mortality curve for total cholesterol (TC), LDL-C, and non-high-density lipoprotein cholesterol. While high cholesterol remained a clear driver of coronary heart disease, very low levels—specifically LDL-C below 70 mg/dL and TC below 120 mg/dL—were linked to an increased risk of all-cause mortality. This increase was driven primarily by a higher incidence of gastrointestinal and urological cancers, as well as an elevated risk of hemorrhagic stroke. According to the study authors, these risks appeared independent of traditional confounding factors such as nutrition or obesity, suggesting a direct biological link between low lipid levels and cellular vulnerability.

Ethnic Discrepancies and Optimal Threshold Variations

The research highlighted significant ethnic differences in how cholesterol levels impact long-term health outcomes. For Chinese adults, the optimal thresholds were identified at 200 mg/dL for TC and 130 mg/dL for LDL-C. In contrast, the UK cohort displayed an L-shaped dose-response curve, where higher cholesterol levels did not correlate with the same mortality spike seen in the Chinese group. UK adults also showed much higher optimal thresholds, with LDL-C peaking at 175 mg/dL. These discrepancies are likely due to a combination of genetic heterogeneity, better management of cardiovascular comorbidities, and differing baseline lipid profiles between the two populations.