How early should you start lowering your LDL cholesterol?

LDL cholesterol is not merely a risk factor but a direct cause of atherosclerosis. The disease process begins as early as childhood and accumulates silently throughout life. The earlier and the longer your LDL is elevated, the greater the damage that builds up in your blood vessels.

What matters is the total amount of LDL you have carried in your blood over the years. A large pooled study found that people who had, on average, a higher LDL from young adulthood through middle age had roughly one and a half times the rate of heart attacks, even when their LDL at middle age itself was not particularly abnormal. The same LDL burden accumulated before the age of forty causes more damage than the same burden arising later in life.

For people with an inherited form of high cholesterol (familial hypercholesterolaemia), the urgency has been most clearly demonstrated. Children with this condition who started a statin at an average age of around ten had a cumulative probability of a heart attack or other vascular event of just 1 percent by age 39. In their parents, who were not treated until adulthood, that figure was 26 percent. This is one of the strongest pieces of direct evidence that early intervention genuinely pays off.

For the general population without an inherited condition, the evidence is less direct, but the message is the same: the longer your LDL stays low, the fewer plaques form in your artery walls. Research suggests that the period from age 18 to 40 is critical. An average level of atherogenic particles (apoB, a measure closely linked to LDL) below 75 mg/dL during that period appears to be the threshold at which risk remains low afterwards. Paying attention early to diet, physical activity and, where appropriate, medication is therefore not a luxury but a long-term investment.