Heart & vessels

Cholesterol, blood pressure and vascular age , the biggest cause of death.

100 answers, from 637 studies

Last updated: July 2026

Key questions

Does taking omega-3 help you stay healthy for longer?

Omega-3 likely has benefits, but for whom and from which source varies considerably. The most concrete benefit has been…

Preliminary evidence

Does sitting all day increase your risk of heart problems?

Sitting a lot increases your risk of heart failure and heart-related mortality, even if you exercise regularly. Just 30…

Yes · Strong evidence

Can clogged blood vessels be cleaned up again?

Early atherosclerosis can partially reverse, particularly with strong LDL lowering through statins or newer agents. The…

Yes · Moderate evidence

Does nattokinase work against blood clots and for your heart?

A large randomised trial found no measurable benefit whatsoever from nattokinase for the heart or blood clotting in humans…

No · Moderate evidence

Does hormone therapy help women age more healthily?

Hormone therapy relieves menopausal symptoms well and shows positive indications for bones and metabolism, but the effects on…

Moderate evidence

What does menopause do to your risk of cardiovascular disease?

Menopause demonstrably increases your risk of cardiovascular disease, primarily through unfavourable changes in fat…

Yes · Strong evidence

What does a daytime nap do to your health?

A short nap of less than 30 minutes appears safe and good for alertness. People who regularly nap for longer than half an hour…

Moderate evidence

Is coffee healthy or unhealthy?

For healthy adults, moderate coffee consumption (3 to 5 cups per day) is more likely to be healthy than unhealthy; if you are…

Yes · Moderate evidence

Do you really need to take 10,000 steps a day?

No, 10,000 steps is not a magic threshold: health gains are already present at 4,000 to 6,000 steps a day, and the return per…

No · Moderate evidence

Are seed oils such as sunflower oil bad for you?

Based on current research, seed oils are not bad for you; on the contrary, they lower LDL cholesterol and are associated with…

No · Moderate evidence

Which supplements are best avoided when taking blood thinners?

Several commonly used supplements, particularly ginkgo biloba, cranberry, and St. John's wort, can dangerously amplify or…

Moderate evidence

How much omega-3 with EPA and DHA do you need per day?

There is no one-size-fits-all dose: for heart protection ~840 mg of EPA+DHA per day is probably sufficient, for an…

Moderate evidence

Does poor sleep really shorten your life?

Consistently sleeping too little is associated with a measurably higher risk of earlier death and serious illness; the…

Yes · Strong evidence

Are ultra-processed products bad for your longevity?

Eating a lot of ultra-processed products is associated with a shorter lifespan and more chronic disease, but the effect varies…

Yes · Moderate evidence

Does the form of omega-3 you choose matter?

The form theoretically matters for absorption, but whether that actually makes a difference to your blood levels during months…

Preliminary evidence

Should you take vitamin D together with vitamin K2?

Vitamin K2 has its own effect on bones, but the combination with vitamin D is not demonstrably better than K2 alone. For the…

Preliminary evidence

Does your resting heart rate say anything about how fast you are ageing?

A structurally high resting heart rate, certainly above 80 to 90 beats per minute, is associated with a clearly higher risk of…

What is the relationship between fatty liver and type 2 diabetes?

Fatty liver and type 2 diabetes mutually reinforce each other, with abdominal fat and insulin resistance at their shared core.…

Can you drink coffee during intermittent fasting?

Black coffee fits perfectly well with intermittent fasting and is even recommended as a suitable beverage; adding milk or…

Yes · Preliminary evidence

Does smoking age a smoker's skin on the inside too, or only on the outside?

Smoking does not only age the outside of your skin; it damages blood vessels, protective barriers and inflammatory regulation…

What is the relationship between high blood pressure and inflammation?

High blood pressure and inflammation reinforce each other mutually, and higher inflammatory values in the blood mean a…

Can chronically poor sleep cause me to have a stroke at a younger age?

Chronically poor or insufficient sleep is associated with an increased risk of cardiovascular disease, including stroke. If…

Yes · Strong evidence

Can you see your biological age in your blood pressure?

Your blood pressure, and especially your nighttime blood pressure, says something about how your blood vessels are ageing, but…

Can intense exercise actually make you age faster?

Regular exercise slows ageing rather than accelerating it, but for vascular health in people with excess weight, weight loss…

No · Moderate evidence

Can your gut microbiome influence your risk of heart disease?

Your gut microbiome influences your heart health through metabolic by-products that can promote arterial hardening, high blood…

Yes · Moderate evidence

Can your gut microbiome affect your cholesterol?

Your gut microbiome influences your cholesterol through bile acid conversion and the fermentation of fibres. Eating more fibre…

Which blood values tell you something about how quickly you are biologically ageing?

Blood values such as protein profiles, DNA methylation patterns, telomere length and common inflammatory markers each provide…

What does high cholesterol do to your brain as you age?

High cholesterol in middle age likely increases the risk of dementia, but at older ages the relationship is less clear and…

Can sleep deprivation raise your blood pressure?

Chronically sleeping too little is associated with a clearly elevated risk of high blood pressure. If your blood pressure is…

Yes · Moderate evidence

What is the link between gum disease and heart disease?

The link between gum disease and heart disease has been found consistently across dozens of studies, but whether it is truly…

How bad is sitting for too long for your blood sugar and metabolism?

Sitting for long uninterrupted periods noticeably impairs your blood sugar and metabolism, but short breaks of 2-3 minutes of…

What does alcohol do to your gut microbiome?

Chronic heavy drinking demonstrably disrupts the gut microbiome, with consequences for the heart and liver. Moderate drinking…

Does your immune system age at a different rate than your heart?

Your immune system and heart do indeed age at a different pace and through different mechanisms, although they do influence…

What does a low-carbohydrate diet do to your LDL cholesterol in the long term?

A low-carbohydrate diet raises LDL in the short term, but that effect often disappears after a year; the effect on…

Can statins (cholesterol-lowering medications) affect your bones?

The available study contains no data on bones, so no answer can be given on the basis of this material. If you have concerns…

Insufficient evidence

What does long-term sleep deprivation do to your heart?

Prolonged sleep deprivation raises your risk of high blood pressure, coronary artery disease and diabetes through multiple…

Can high blood pressure in your 40s cause dementia later in life?

High blood pressure in your forties demonstrably increases your risk of dementia later in life, and early treatment appears to…

What is visceral fat and why is it more dangerous than subcutaneous fat?

Visceral fat is more dangerous than subcutaneous fat because it acts directly on the liver, releases more inflammatory…

What are the earliest signs of insulin resistance?

Early signs of insulin resistance are measurable long before a diabetes diagnosis: elevated fasting insulin, abdominal fat,…

Can your HbA1c also be too low?

An HbA1c below 5.0% is associated with an increased risk of death in people without diabetes, although this is likely a signal…

Yes · Moderate evidence

What does your HbA1c tell you about your risk of diabetes and ageing?

An elevated HbA1c, even well below the official diabetes threshold, is associated with a greater risk of diabetes, kidney…

Who should have their ApoB measured?

Measuring ApoB is worthwhile for more people than current guidelines suggest: not only in cases of elevated blood fats, but…

Moderate evidence

How does too much LDL or ApoB lead to clogged arteries?

Too many LDL particles and too much apoB in your blood set off a chain reaction that slowly clogs arteries. The evidence for…

How do you lower an elevated ApoB?

The most effective way to lower ApoB is with PCSK9 inhibitors (alirocumab or inclisiran, by prescription). Daily porridge also…

Moderate evidence

What is a healthy ApoB level?

There is no fixed 'healthy' ApoB value, but below 82 mg/dL the risk of a stroke already decreases measurably. ApoB offers…

What does your ApoB value tell you about your risk of cardiovascular disease?

A higher ApoB value is strongly and consistently associated with greater risk of cardiovascular disease, and predicts that…

Is an ECG from your smartwatch actually useful?

For detecting atrial fibrillation, a smartwatch ECG can be useful, especially as a supplement to medical monitoring. For other…

Yes · Moderate evidence

Which foods or supplements keep your blood vessels healthy?

The Mediterranean diet most demonstrably lowers your risk of cardiovascular disease. Individual supplements do not help.

Moderate evidence

How much does a consistent sleep schedule actually matter?

A consistent sleep schedule genuinely matters. Irregular sleep times are strongly associated with more depression, anxiety, a…

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…

Do omega-3s help against cardiac arrhythmias?

Fish oil supplements have no demonstrable benefit against cardiac arrhythmias. At high doses they actually increase the risk…

No · Strong evidence

How dangerous is a fatty liver (hepatic steatosis)?

A fatty liver is more serious than most people think, primarily because of the elevated risk of cardiovascular disease. Losing…

How much fish is healthy, and is farmed fish just as good as wild fish?

Three to four portions of fish per week is healthy for most people. Whether farmed fish and wild fish are nutritionally…

Yes · Strong evidence

Is wholegrain bread really that much better than white bread?

Large-scale observational research consistently points in the same direction: wholegrain is better for your heart, your weight…

Yes · Moderate evidence

How many servings of vegetables and fruit do I actually need per day?

Five servings of vegetables and fruit per day is the threshold that offers the greatest protection. More than five provides no…

What does the menopause do to my heart and bones in the long term?

In the long run, menopause increases your risk of cardiovascular disease and bone loss, and that effect is greater with an…

Does losing weight noticeably improve my blood pressure and cholesterol?

Losing weight noticeably lowers your blood pressure and improves your cholesterol profile, but which value improves the most…

Yes · Strong evidence

Should I be worried about a mildly elevated cholesterol if everything else looks fine?

A mildly elevated cholesterol is not automatically harmless: the overall picture, including triglycerides and lipoprotein(a),…

Moderate evidence

How harmful is prolonged stress really for my heart?

Long-term stress measurably increases your risk of cardiovascular disease, particularly through work-related stress (10-40%…

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.…

Yes · Strong evidence

Heart palpitations or an irregular heartbeat -- when should I see a doctor?

Palpitations are usually harmless, but can also be the beginning of a serious cardiac arrhythmia. If you also experience…

Moderate evidence

How often should I measure my blood pressure at home, and what is normal?

Home measurement is more reliable than a single reading at the GP's office. Measure at fixed times over several days and…

Yes · Moderate evidence

Do some people age primarily through their heart and others through their metabolism?

Yes, people age through different organ pathways. The science needed to map this precisely for each individual is promising,…

What is a healthy HDL (good cholesterol) level, and can I raise it?

Raising HDL through lifestyle is possible, but your genes set the ceiling. Lowering triglycerides through less sugar and…

Moderate evidence

What does my CRP value (inflammation) say about my heart?

A high hsCRP value points to chronic inflammation and predicts a clearly elevated long-term risk of cardiovascular problems,…

What is a healthy waist circumference and why does it matter?

A larger waist circumference is associated with a greater risk of diabetes, bone fractures, gum disease and premature death.…

Do B vitamins (folate, B6) benefit your heart and brain?

Folic acid reduces stroke risk by approximately 16%, but probably only if you have a deficiency. For broader cardiovascular…

Moderate evidence

Does CoQ10 help your heart or your energy levels?

For people with heart failure or an elevated cardiac risk, the evidence looks positive for CoQ10, particularly the ubiquinone…

Yes · Moderate evidence

Is loud snoring dangerous for my health?

Loud snoring is associated with serious health risks: arterial calcification, higher mortality after a heart attack and…

Yes · Moderate evidence

Does climbing stairs actually do anything for my heart?

Yes, climbing stairs genuinely does something for your heart. Climbing roughly 50 to 100 steps a day is associated with fewer…

Yes · Moderate evidence

How harmful are trans fats, exactly?

Industrial trans fats are the most harmful fats in the current food supply. They demonstrably worsen your cholesterol profile…

Do omega-3 (fish oil) supplements help my heart?

For people with existing heart disease there is reasonable evidence that omega-3 supplements help, especially at high doses of…

Moderate evidence

How healthy are my blood vessels / what is my vascular age?

For a first impression of your vascular health, an ApoB blood test is the simplest and most accessible step; a CAC scan adds…

Does lowering my blood pressure really reduce my risk?

Lowering blood pressure genuinely works: your risk of stroke and other cardiovascular problems demonstrably decreases.…

Yes · Strong evidence

What is a healthy cholesterol level and when should I be concerned?

A normal LDL value does not give a complete picture of your cardiovascular risk. Ask your doctor about your remnant…

Moderate evidence

What is Lp(a) and is there anything I can do about it?

Lp(a) is a hereditary risk factor for cardiovascular disease that is independent of your LDL. Effective treatments are still…

Yes · Strong evidence

What does my blood pressure say about my long-term health?

A structurally high or strongly fluctuating blood pressure substantially increases your risk of stroke, heart attack and…

How healthy are yoghurt and dairy for your heart and bones?

Moderate dairy consumption fits well within a heart- and bone-friendly diet, with yoghurt as the best choice. As long as your…

Does garlic help with high blood pressure or cholesterol?

Garlic supplements can moderately lower blood pressure and cholesterol, but are not a replacement for medication and are not a…

Yes · Strong evidence

Is high homocysteine bad for my heart?

High homocysteine is a clear signal that something deserves attention, but it is probably more of a warning light than a…

Moderate evidence

How important is my triglyceride level?

Your triglyceride level is a serious risk factor. Always assess it together with your HDL cholesterol, blood sugar and waist…

Does my heart rate variability (HRV) tell me anything about my health?

A higher HRV is associated with better health and greater resilience. Slow breathing is the most accessible and best-supported…

What is a healthy resting heart rate?

For most people the rule holds: the lower the resting heart rate, the more favourable the picture for cardiovascular disease…

Does vitamin K2 help your bones and blood vessels?

Vitamin K2 probably helps with bone building in postmenopausal women, but for blood vessels and fracture risk the evidence is…

Yes · Moderate evidence

Does dark chocolate or cocoa benefit your heart?

Dark chocolate with a high cocoa content appears to be beneficial for the heart, but the evidence remains observational. A…

Yes · Moderate evidence

Are nuts good for your heart and your weight?

For most people, a daily handful of nuts is a well-supported choice for a healthier heart. Those who want to lose weight or…

Yes · Moderate evidence

How healthy is olive oil and what is it good for?

If you want to improve your cardiovascular health, daily extra virgin olive oil, especially when used in place of butter or…

Are eggs bad for your cholesterol?

For most healthy people, one or two eggs a day poses no problem for their cholesterol, as long as they are not also consuming…

Yes · Moderate evidence

How bad is eating a lot of salt for me?

Eating less salt demonstrably lowers your blood pressure and reduces the risk of cardiovascular disease, and that effect is…

Is the Mediterranean diet really good for your heart, and why?

For people with an elevated cardiovascular risk, the Mediterranean diet is the best-supported dietary choice currently…

Yes · Strong evidence

Is coffee good or bad for your heart?

For most healthy adults, three to four filtered cups per day are associated with a beneficial effect on the heart and blood…

Yes · Moderate evidence

Is interval training (HIIT) better for my heart than regular cardio?

HIIT delivers slightly more benefit for your cardiovascular fitness than regular cardio. The difference is not enormous, but…

Yes · Moderate evidence

How many steps per day should I aim for?

Health benefits begin well below 10,000 steps. For most adults, the sweet spot is between 7,000 and 9,000 steps per day.

Moderate evidence

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…

Moderate evidence

Should I take statins if I have (not yet) had a heart problem?

Whether statins are worthwhile depends on your personal risk. At a calculated 10-year risk of 10% or higher and at least one…

Strong evidence

Is a calcium score of my heart worth doing?

Unsure whether to start taking statins? A calcium score can help inform that decision: a score of zero is highly reassuring,…

Moderate evidence

How dangerous is belly fat?

A large amount of belly fat increases the risk of cardiovascular disease, gallstones and fatty liver, even when no other…

Is ApoB more important than regular cholesterol (LDL)?

ApoB provides more information about your cardiovascular risk than LDL cholesterol alone. Also ask about non-HDL, as clear…

Yes · Moderate evidence

Does poor gum health affect my heart?

Severe gum disease (periodontitis) is consistently associated with a higher risk of cardiovascular disease, so it is…

Yes · Moderate evidence

Does regular sauna use help you live longer?

Regular sauna bathing is associated with a lower risk of premature death and cardiovascular disease in large observational…

Yes · Moderate evidence

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