Cholesterol
For decades, cholesterol has been framed primarily as a cardiovascular villain. Yet biologically, cholesterol is indispensable to human life. Understanding its full role requires looking beyond the simple LDL-versus-HDL framework and examining its functions in metabolism, aging, and brain health — as well as the ongoing debate surrounding statin therapy.
It is absolutely crucial to understand that cholesterol is not a toxin — it is a structural and functional necessity and it is required for cell membrane stability and fluidity, synthesis of steroid hormones (estrogen, testosterone) cortisol, vitamin D production, bile acid formation for fat digestion and synapse formation and brain structure.
The human brain contains roughly 20–25% of the body’s cholesterol, most of which is produced locally within the brain itself. Cholesterol plays a central role in synapse formation and neuronal repair.
The familiar lab numbers — LDL (low-density lipoprotein) and HDL (high-density lipoprotein) cholesterol — are shorthand for how cholesterol is carried in the bloodstream. LDL carries cholesterol to tissues, and high levels are linked to artery plaque formation. HDL helps transport cholesterol back to the liver for removal. But focusing only on these numbers oversimplifies what’s happening inside the body and can distract from deeper drivers of disease.
LDL and HDL describe transport particles — not cholesterol itself. Cardiovascular risk depends not just on LDL-C levels but also on:
LDL particle number (LDL-P)
ApoB levels
Triglyceride/HDL ratio
Insulin resistance
Systemic inflammation
Therefore, metabolic health may be as important — if not more important — than cholesterol concentration alone and the idea that LDL cholesterol is the cause of heart disease — can overshadow other biological drivers like insulin resistance, inflammation, stress, and lifestyle factors.
As emphasized by number of clinicians, insulin resistance drives many of the metabolic conditions linked to cardiovascular disease and while mainstream cardiology still supports LDL reduction, there is growing agreement that metabolic dysfunction is central.
We now know that insulin resistance is a stronger predictor of cardiovascular disease and type 2 diabetes than LDL cholesterol per se and focusing exclusively on LDL for prevention ignores the true metabolic drivers of disease.
Understanding cholesterol as a participant in repair rather than the original instigator changes the prevention strategy. Instead of asking ‘How do we lower LDL”, the more fundamental question is “How do we reduce chronic inflammation and restore metabolic health?”
Let’s use car crash incident as anology to describe the mechanism of cholesterol accumulation.
When a crash occurs:
Emergency vehicles rush to the scene.
Traffic slows.
Cars pile up behind the blockage.
If you arrive later and see the congestion, you might assume the traffic caused the accident.
But in reality, the traffic jam is a consequence — not the cause.
Cholesterol in arteries can be thought of similarly. When endothelial injury occurs, LDL particles accumulate in the vessel wall as part of the repair process. If oxidative stress and inflammation persist, immune cells become involved, and plaque develops.
Lowering cholesterol will NOT resolve an issue of inflamation…and only when inflammation decreases, endothelial injury decreases. When injury decreases, the body doesn’t need to deploy as much cholesterol to repair the damage.
The relationship between cholesterol levels and long-term health isn’t straightforward but from a large systematic reviews (on people over 60) we know that in fact higher LDL cholesterol is often associated with lower mortality. Such findings challenge the assumption that LDL is uniformly harmful across all age groups.
In addition s recent analysis from the Framingham Offspring Cohort reported that higher dietary cholesterol intake was associated with a reduced risk of all-cause dementia and Alzheimer’s dementia over many years. This has led to question whether very low cholesterol — especially in older adults — may inadvertently affect neurological resilience.
Yet still, statins remain among the most widely prescribed medications in the world, despite many users report cognitive changes and so called “brain fog” as well as memory difficulties, or emotional changes following the introduction of statins. Several people have described forgetfulness, confusion, or changes in personality after starting statins, with some reporting improvement after discontinuation. Others report additional side effects such as restlessness, dizziness, shortness of breath, sleep issues, or fatigue
Therefore, it is crucial to truly understand the role of cholesterol, the reasons behind raised results and potential side affect and danger associated with statins before these are considered.
Lifestyle and metabolic markers should drive prevention strategies. Diet, physical activity, sleep and stress management are core to their frameworks — not just pharmaceutical intervention.
And both individuals and clinicians should always weigh absolute benefits, potential side effects and personal risk profiles when considering statins.