HDL Cholesterol
| Clinical | Optimal | |
|---|---|---|
| Male | 0.9 - 2.5 mmol/L | Above 1.0 mmol/L (ideal above 1.2 mmol/L) |
| Female | 1.0 - 2.8 mmol/L | Above 1.2 mmol/L (ideal above 1.4 mmol/L) |
What is HDL Cholesterol?
High-density lipoprotein (HDL) cholesterol is often referred to as 'good' cholesterol because of the protective role it plays in your cardiovascular system. HDL particles act as tiny scavengers, travelling through your bloodstream and collecting excess cholesterol from your artery walls. They then carry this cholesterol back to your liver, where it is broken down and removed from the body.
Unlike LDL cholesterol, which deposits cholesterol into your artery walls, HDL works in reverse, actively helping to prevent the build-up of arterial plaque. This reverse cholesterol transport mechanism is one of your body's key natural defences against heart disease.
HDL also has anti-inflammatory and antioxidant properties, which further protect your blood vessels from damage. It is one of the most important markers to monitor in any cardiovascular health assessment and is a core component of your Omniwo lipid profile.
Why HDL Cholesterol Matters for Your Health
Higher HDL levels are consistently associated with a lower risk of heart disease and stroke. In fact, HDL is one of the few biomarkers where higher is generally better. Each 0.1 mmol/L increase in HDL has been associated with a meaningful reduction in cardiovascular risk.
From a longevity perspective, robust HDL levels are a hallmark of healthy ageing. Studies of centenarians frequently show that these individuals tend to maintain higher HDL levels throughout their lives. HDL not only protects your arteries but also supports healthy endothelial function, the inner lining of your blood vessels that keeps blood flowing smoothly.
Low HDL is considered an independent risk factor for cardiovascular disease, meaning it increases your risk even if your other cholesterol numbers look normal. This makes it a particularly important marker for anyone focused on proactive health management and disease prevention.
HDL Cholesterol& Your Wearable Data
HDL cholesterol, often called "good" cholesterol, is one of the biomarkers most responsive to exercise. Wearable data showing consistent aerobic activity — particularly sustained heart rate in zones 2 and 3 — is strongly linked to rising HDL levels. Studies show that 120+ minutes per week of moderate-intensity exercise can raise HDL by 5-10%.
Your wearable's VO2 max estimate is a useful proxy for cardiovascular fitness, which directly correlates with HDL levels. Individuals with higher VO2 max values tend to have significantly better HDL concentrations. Tracking improvements in your estimated VO2 max over months can help predict positive changes in this biomarker.
Sleep quality matters too. Wearable sleep tracking that reveals poor deep sleep or frequent awakenings may correlate with lower HDL. Maintaining consistent sleep schedules and achieving adequate deep sleep phases supports healthy lipid metabolism and HDL production.
What High HDL Cholesterol May Suggest
High HDL cholesterol is generally considered protective and beneficial. Levels above 1.6 mmol/L are associated with a reduced risk of cardiovascular disease. For most people, there is no upper limit of concern, and high HDL is a positive finding.
However, extremely elevated HDL (above 2.3 mmol/L) has been the subject of more recent research. Some studies suggest that at very high concentrations, HDL particles may not function as effectively and could potentially lose some of their protective qualities. This is an evolving area of research and is not yet a cause for concern in most cases.
Factors that naturally raise HDL include regular physical activity, moderate alcohol consumption, a diet rich in healthy fats, and maintaining a healthy body weight. Genetic factors can also contribute to naturally high HDL levels, particularly in women.
What Low HDL Cholesterol May Suggest
Low HDL cholesterol is a significant risk factor for cardiovascular disease and is commonly seen alongside other metabolic issues such as elevated triglycerides, insulin resistance, and abdominal obesity. This cluster of factors is sometimes referred to as metabolic syndrome.
Low HDL reduces your body's ability to clear excess cholesterol from your arteries, leaving you more vulnerable to plaque build-up over time. Common causes include physical inactivity, smoking, a diet high in refined carbohydrates and trans fats, type 2 diabetes, and obesity.
Certain medications and medical conditions can also lower HDL. If your results suggest low HDL levels, it is important to address this through lifestyle changes, as even modest improvements can significantly enhance your cardiovascular protection.
How to Optimise Your HDL Cholesterol
Food
Consume oily fish such as salmon, mackerel, and sardines regularly for their omega-3 fatty acids, which support HDL levels, Use extra virgin olive oil as your primary cooking fat, as the polyphenols and monounsaturated fats help raise HDL, Eat avocados regularly, which provide monounsaturated fats shown to increase HDL while lowering LDL, Include purple and red fruits such as berries and grapes, which contain anthocyanins linked to improved HDL function, Add flaxseeds and chia seeds to your diet for their combined fibre and omega-3 content
Lifestyle
Prioritise regular aerobic exercise, as cardiovascular activity is one of the most effective ways to raise HDL, aiming for 30 minutes most days, Stop smoking, as this alone can increase HDL by up to 10% within weeks of quitting, Reduce refined carbohydrate and sugar intake, as these lower HDL and raise triglycerides, Maintain a healthy waist circumference, as visceral fat is strongly linked to low HDL levels, Consider high-intensity interval training (HIIT), which some studies suggest may raise HDL more effectively than moderate exercise
Supplements
Omega-3 fish oil (1-2g EPA/DHA daily) may modestly support HDL levels alongside a healthy diet, Niacin (vitamin B3) has been shown to raise HDL, though it should be used under guidance due to potential side effects at high doses, Coenzyme Q10 (100-200mg daily) may support overall cardiovascular function and HDL metabolism
When to Speak to Your GP
Speak to your GP if your HDL results suggest levels below 1.0 mmol/L for men or below 1.2 mmol/L for women, particularly if combined with elevated LDL, high triglycerides, or other cardiovascular risk factors. Also seek advice if you have a family history of early heart disease, or if low HDL persists despite sustained lifestyle changes over three to six months.
References
- NHS. High cholesterol — Causes. Updated 2024. nhs.uk
- NICE. Cardiovascular disease: risk assessment and reduction, including lipid modification. CG181. nice.org.uk
- NEJM. Voight BF, et al. Plasma HDL cholesterol and risk of myocardial infarction: a mendelian randomisation study. Lancet. 2012;380(9841):572-580. pubmed.ncbi.nlm.nih.gov
- AHA. Rosenson RS, et al. HDL and atherosclerotic cardiovascular disease. Circulation. 2016;133(1):87-96. pubmed.ncbi.nlm.nih.gov
- BMJ. Di Angelantonio E, et al. Major lipids, apolipoproteins, and risk of vascular disease. JAMA. 2009;302(18):1993-2000. pubmed.ncbi.nlm.nih.gov
Medical Disclaimer— This content is for general educational and informational purposes only. It does not constitute medical advice, diagnosis, or treatment. Omniwo Ltd is a wellness information service and is not a medical device, clinical laboratory, or regulated healthcare provider under MHRA guidelines. The “optimal ranges” presented on this page are based on published clinical guidelines (WHO, NICE, NHS) and peer-reviewed research; they represent functional wellness targets and may differ from standard laboratory reference ranges. Individual results should always be interpreted by a qualified healthcare professional (such as your GP) who understands your full medical history. Do not start, stop, or change any medication or supplement based solely on this information. If you are experiencing symptoms, seek medical attention promptly.