In Chinese adults, having too little 'bad' cholesterol might actually increase the risk of bleeding strokes, especially if heart disease risk is already low — and this could mean that both very low and very high cholesterol levels are linked to higher chances of dying.

What we've found so far suggests that in Chinese adults with low heart disease risk, having very low levels of LDL cholesterol might be linked to a higher chance of hemorrhagic stroke. Our analysis of the available research shows this possibility is supported by the evidence we've reviewed, with 59.0 assertions supporting this link and none refuting it [1]. We looked at what the data tells us about cholesterol levels and stroke risk in this specific group. The evidence we've reviewed leans toward the idea that both very low and very high LDL cholesterol levels could be associated with increased health risks, including a greater chance of bleeding in the brain, known as hemorrhagic stroke [1]. This does not mean low LDL causes such strokes, but it does suggest a pattern worth paying attention to. It also suggests that extremely low cholesterol might not always be better, especially when heart disease risk is already low. Our current analysis shows that cholesterol balance may matter more than simply aiming for the lowest possible LDL. The findings are based on data from Chinese adults, so we can't say whether this applies to other groups. Also, while the number of supporting assertions is high, we are still working with a limited set of studies — just one distinct assertion analyzed so far, even if repeated across many sources. We don’t yet have enough evidence to say exactly how or why this link might exist, or whether changing cholesterol levels would change stroke risk. This is a developing area, and our understanding will grow as more data becomes available. Practical takeaway: If you're a Chinese adult with low heart disease risk, very low LDL cholesterol might not be as harmless as once thought — it could be worth discussing with your doctor whether your levels are in a healthy range, not too high or too low.