What is HDL cholesterol?
HDL stands for high-density lipoprotein. It's called "good" cholesterol because HDL particles act like cleanup crews — they pick up excess cholesterol from your artery walls and carry it back to the liver, where it gets recycled or removed. This process is called reverse cholesterol transport.
Think of it this way: if LDL is dropping off cholesterol where you don't want it, HDL is picking it up and taking it away. The more efficient this cleanup process is, the less plaque accumulates in your arteries.
Why it matters for longevity
Higher HDL levels are consistently associated with lower cardiovascular risk. People with very low HDL tend to have higher rates of heart attacks and strokes, even when their other numbers look fine.
HDL does more than just transport cholesterol. It also has anti-inflammatory and antioxidant properties that help protect your blood vessels. Studies show that the combination of high HDL and low is one of the strongest metabolic health signals you can have.
For women: Women naturally tend to have higher HDL levels than men, partly due to estrogen's protective effect. This is one reason women have lower heart disease rates before menopause. After menopause, as estrogen declines, HDL levels often drop — making it even more important to track this number and support it through lifestyle.
What the numbers mean
The conventional guidelines for HDL cholesterol are:
- Low (higher risk): below 40 mg/dL for men, below 50 mg/dL for women
- Acceptable: 40–59 mg/dL
- Optimal (protective): 60 mg/dL or above
Most longevity-focused physicians want to see HDL above 60 mg/dL. For women, who naturally run higher, aiming for 70+ mg/dL is reasonable. However, extremely high HDL (above 100 mg/dL) doesn't necessarily provide extra protection and may sometimes indicate a genetic variant worth discussing with your doctor.
What affects it
- Exercise: This is the most powerful natural HDL booster. Aerobic exercise — especially sustained moderate-intensity activity like zone 2 cardio — reliably raises HDL over time.
- Body composition: Excess body fat, particularly visceral fat, is linked to lower HDL. Improving your tends to raise HDL naturally.
- Diet: Healthy fats (olive oil, avocados, nuts, fatty fish) support HDL. Trans fats actively lower it. Moderate alcohol intake may raise HDL slightly, but the risks generally outweigh this small benefit.
- Smoking: Smoking lowers HDL significantly. Quitting is one of the fastest ways to improve your numbers.
- Genetics: HDL levels are partly inherited. Some people naturally have very high or very low HDL regardless of lifestyle. But for most people, exercise and diet make a meaningful difference.
- Insulin resistance: Poor metabolic health — high triglycerides, high blood sugar, excess abdominal fat — is strongly associated with low HDL. Improving insulin sensitivity raises HDL as a downstream effect.
How to get tested
HDL is included in every standard lipid panel. You'll need to fast for 9–12 hours before the blood draw, though HDL itself is relatively stable and less affected by fasting than triglycerides. Any doctor can order this, and it's also available through online lab services. Testing once or twice a year is usually sufficient.
How to improve it
- Exercise regularly. This is the number one lever. Both aerobic exercise and strength training raise HDL. Aim for at least 150 minutes per week of moderate activity. Use our Heart Rate Zone Calculator to find your zone 2 training range.
- Eat more omega-3 fatty acids. Fatty fish (salmon, sardines, mackerel), walnuts, and flaxseeds support a healthy lipid profile and can help raise HDL.
- Reduce refined carbs and sugar. Excess sugar and processed carbs raise triglycerides, which tends to push HDL down. Cutting back shifts the balance in a healthier direction.
- Maintain a healthy weight. Even modest fat loss can meaningfully increase HDL levels, especially if you're carrying weight around your midsection.
- Quit smoking. HDL levels typically increase within weeks of quitting. It's one of the most impactful single changes you can make for your lipid profile.
- Look at the full picture. HDL is most meaningful when interpreted alongside your triglycerides, LDL, and ApoB. A high HDL doesn't cancel out a dangerous LDL or ApoB level.