Heart disease doesn't arrive suddenly. It builds quietly, over decades, in the walls of your arteries, until one day it can't be ignored. Which is exactly why most people in their 20s and 30s don't think about it at all.

If you're in your 20s or 30s, you feel fine. But the biology in your arteries right now is laying the foundation for what shows up in your 40s, 50s and 60s. The choices you make in this window have a disproportionate influence on how that plays out.

Why we ignore slow-moving threats

The brain is good at responding to immediate danger. It's much worse at sustaining concern about risks that are 20 or 30 years away. This isn't a character flaw, it's evolutionary. We're wired to respond to threats that can kill us today, not in three decades.

We feel young, we feel well, we have no symptoms, and so we conclude nothing is wrong. Because the consequences are decades away, the urgency to act never really arrives.

Most people have a vague sense that diet and exercise matter for long-term health. But vague sense is not felt urgency, and felt urgency is what drives behaviour change.

What cholesterol actually is

Cholesterol is not a poison. It's a substance your body produces and needs: for cell membranes, hormone synthesis, vitamin D production. You could not function without it.

The problem is what happens when there's too much low-density lipoprotein (LDL) in the blood, and when that LDL becomes oxidised.

LDL carries cholesterol from the liver to the rest of the body. When levels are elevated over time, LDL particles penetrate artery walls and trigger an inflammatory response. The body sends immune cells to the site, and over time this forms plaques: fatty deposits that narrow and stiffen the arteries.

HDL works in the opposite direction, carrying cholesterol away from the arteries back to the liver. High HDL is protective. Low HDL combined with high LDL and elevated triglycerides is where the risk profile becomes genuinely concerning.

When it starts

Atherosclerosis does not begin in middle age. It begins significantly earlier.

Post-mortem studies on soldiers killed in their early 20s found early atherosclerotic plaque in a significant proportion of them. More recent imaging research has found arterial changes in teenagers with elevated LDL. The disease process that kills people in their 50s and 60s starts building decades before any symptom appears.

You are not too young to worry about this. You are at the exact age where the choices you make are either building or eroding your future cardiovascular health.

What drives it

Poor cardiovascular markers are not inevitable. They're significantly influenced by lifestyle, and the factors that matter most are ones you control.

Visceral fat. Visceral fat (the fat around your organs) is metabolically active in ways subcutaneous fat is not. It drives chronic inflammation, accelerates plaque formation and raises LDL. Reducing it is one of the highest-leverage things you can do for cardiovascular health.

Exercise. Both cardiovascular training and resistance training raise HDL, lower LDL and triglycerides, reduce blood pressure and improve insulin sensitivity. The protective effect of consistent exercise on cardiovascular health is one of the most robustly supported findings in medicine.

Diet quality. Dietary patterns matter more than any single food. Ultra-processed foods, excess refined carbohydrates, and a diet low in vegetables, fibre and healthy fats all worsen lipid profiles. Eating with some awareness of food quality, without being obsessive, moves the needle meaningfully over time.

Sleep and stress. Both independently worsen cardiovascular markers. Cortisol raises blood glucose, promotes abdominal fat storage and drives inflammation. If you're consistently under-slept and stressed, this is not separate from your cardiovascular health. It's part of the same picture.

Why act now

The point of all this is not to make you afraid. Fear produces brief action and then avoidance. The point is to give you an accurate picture so you can make an informed decision.

The people who take this seriously in their 30s aren't doing it from anxiety. They've thought about the life they want in their 50s and 60s and worked backwards. It's not restriction. It's investment, and like most investments, the earlier you start, the more it compounds.

The alternative is waiting until something goes wrong. People make that choice constantly, by default, because the urgency never feels real enough to act on.

What to do

Get your bloods checked. A standard lipid panel gives you a baseline. You can't manage what you're not measuring.

Build consistent exercise into your week. Cardiovascular work for lipid profiles and blood pressure; resistance training for body composition and metabolic health. Three to four sessions a week, done consistently, produces real changes in cardiovascular risk.

Reduce visceral fat if you're carrying excess body fat. It doesn't require an extreme programme. A moderate, sustained calorie deficit and consistent exercise is enough.

Take sleep and stress seriously. They're not background factors; they're direct inputs into your cardiovascular health.

And if you want support putting all of this together, that's what the coaching programme is for.

The summary

You are not invincible. No one who is 25 feels that's true, but it is. The biology in your arteries right now is responsive to what you do.

This doesn't require obsession. It requires taking it seriously enough to make a few consistent choices your future self will be grateful for. The people who do this well aren't the ones with the most willpower. They're the ones who understood early enough that it mattered.