How dangerous is belly fat?
Belly fat is a serious risk factor for cardiovascular disease, heart failure, and premature death, and the risk increases the longer it remains elevated. A combination of a Mediterranean diet and regular physical activity is the best-supported approach for reducing it.
Belly fat is not the same as the fat you can feel beneath your skin. What we are talking about here is visceral fat: the fat that sits deep inside the abdominal cavity, surrounding the organs. That fat is metabolically active and can drive inflammation and insulin resistance. Two large Chinese cohorts show just how serious the consequences are. In one study involving more than 41,000 participants and 12 years of follow-up, people with persistently elevated belly fat had nearly 3 times the risk of cardiovascular disease, and nearly 5 times the risk of dying from any cause, compared with the group with low belly fat. The longer belly fat remained elevated, the greater the risk.
A second large cohort study involving more than 8,000 participants showed that people with a lot of belly fat but without clear insulin resistance actually had the highest cumulative risk of cardiovascular disease, up to 87% higher than the lowest-risk group. That is striking: even without other metabolic problems, belly fat is independently dangerous. In an American study of nearly 25,000 people, greater belly fat was associated with 2.7 times as much heart failure in the highest versus the lowest group.
The combination of low muscle mass and high belly fat is especially unfavourable. People with the worst ratio of muscle mass to belly fat had nearly 4 times the risk of fatty liver disease (a condition in which fat accumulates in the liver) in an American study. Having more muscle therefore partly offsets the damage caused by belly fat.
What helps to reduce belly fat? A combined approach of a Mediterranean diet plus at least two hours of physical activity per week led to a measurable reduction in belly fat within 12 weeks in a study of people over 50 with high cardiac risk. Exercise alone without dietary changes had a clearly smaller effect. For people with overweight or obesity who are considering medication: GLP-1 agonists such as liraglutide reduced belly fat in a randomised placebo-controlled study by an average of 12.5% versus 1.6% in the placebo group. However, 47% of users reported gastrointestinal problems, compared with 13% in the placebo group. SGLT2 inhibitors (a different class of medication) produce more modest weight loss and also appear to reduce fat accumulation, but the magnitude of that effect has been less well mapped out.
All claims are based on observational cohort studies (associational) and two randomised trials (liraglutide and Mediterranean diet plus exercise). Causal relationships for belly fat as a risk factor have not yet been proven through an intervention trial, but the associations are large and consistent across multiple large cohorts.
Is atrial fibrillation dangerous, and what can I do about it?
Atrial fibrillation substantially increases your risk of death, heart failure, and stroke, and requires active treatment. Discuss blood thinners for stroke prevention with your doctor, as well as which lifestyle changes are worthwhile in your specific situation.
How harmful are trans fats, exactly?
Industrial trans fats are demonstrably harmful to your heart and blood vessels, even in small amounts. Avoid them by checking ingredient lists for 'partially hydrogenated oil'.
How dangerous is a fatty liver (hepatic steatosis)?
For most people, a fatty liver is not acutely dangerous in the short term, but it does raise the risk of cardiovascular disease and, with further progression, of serious liver damage. Discuss it with your doctor if you also have overweight, diabetes, or high blood pressure.
Is loud snoring dangerous for my health?
Loud snoring is associated with serious health risks: arterial calcification, higher mortality after a heart attack and dangerous daytime sleepiness. If you snore loudly on a regular basis and feel tired during the day, have it checked by your general practitioner.
Is high blood pressure at night more dangerous than during the day?
High blood pressure at night is more dangerous than a high daytime reading at the doctor's office. If your blood pressure does not drop enough at night, or even rises, your risk of a heart attack, stroke or heart failure is considerably higher, even if the reading at the practice looks perfectly fine.
Is taking a daily aspirin smart or dangerous?
Whether a daily aspirin is smart or dangerous depends entirely on your age and medical profile. Take aspirin only on a doctor's advice and never stop or start it on your own.