Omega-3, healthy gums, stair climbing: what actually helps your heart?
Some heart health claims hold up, others only partly – and one popular supplement works against you. Here is how the evidence stacks up for five widely discussed habits and measures for the over-50s.
Your heart is on your mind – and rightly so. After fifty, small risks accumulate and the claims come at you faster: take this, measure that, brush like this. On the Heart & Blood Vessels page we gather the evidence for everything that matters. Below we weigh five popular claims, from fish oil to stair climbing, against what the research actually shows.
Stair climbing: the simplest cardio almost nobody counts
The claim that climbing stairs every day protects your heart is correct – but there is a ceiling. Research involving nearly 600,000 people shows that 50 to 100 steps a day is associated with fewer heart attacks, strokes and irregular heart rhythms. Above 100 to 150 steps, the additional benefit does not keep growing. One important caveat: these findings come from studies that followed people over many years, not controlled experiments. The association is consistent and large enough to take seriously, but whether stair climbing itself is the cause – or whether fit people simply tend to take the stairs more often – cannot be read from the data. For people with existing heart disease, the evidence is still too thin to draw firm conclusions. Read the full answer on stair climbing and your heart.
Fish oil: proven effect on blood fats, not on life and death
Fish oil is perhaps the most overrated heart supplement around right now. It is true that omega-3 reliably lowers triglycerides. In people with existing heart disease or high risk, it can modestly reduce the chance of a heart attack. But on total mortality – the measure that matters most – the effect in large randomised trials is essentially zero. Healthy people over fifty without elevated risk have little to gain from a daily fish oil capsule. Earlier enthusiastic results came partly from studies with weaker designs; under more rigorous scrutiny, the benefits largely evaporate.
There is another catch: high doses of omega-3 raise the risk of atrial fibrillation. That is not a theoretical concern – it shows up in multiple randomised trials. A broadly protective effect on heart rhythm disorders has not been demonstrated after decades of research. Do not take high doses of omega-3 to protect your heart rhythm; the effect runs in the wrong direction. Only a specific registered omega-3 medication used in heart failure or after a heart attack shows any positive signal, and that is fundamentally different from a supplement you pick up at the pharmacy.
Gum disease and your heart: a link, yes – a cause, not yet
The claim that poor gum health raises your cardiac risk has been circulating for years. There is something to it, but less than the hype suggests. The association between severe gum disease (periodontitis) and cardiovascular problems appears in multiple studies, and there are plausible biological explanations: bacteria from the gums can travel through the bloodstream and trigger inflammation elsewhere. But in large studies, after adjusting for other risk factors, the association has not yet been established as statistically convincing. Whether treating gum disease actually lowers your cardiac risk has not been shown. That is a crucial distinction. Regular dental check-ups are sensible, especially if you already have other risk factors, but do not count on dental treatment to save your heart. Read more about the relationship between gum health and your heart.
Your resting heart rate: a signal too many people ignore
A consistently high resting heart rate – above 80 to 90 beats per minute – is an independent risk factor for cardiovascular disease and premature death. That association is robust enough to take seriously. Whether a high resting heart rate actually accelerates biological ageing is less well established; that hypothesis rests mainly on animal studies. The practical takeaway is clear: exercise regularly, because aerobic training brings your resting heart rate down. But a very low heart rate in later life is not automatically a good sign. At an advanced age, an unusually low heart rate can also indicate that the sinus node is functioning less well.
HRV: a useful measurement, but not a magic meter
Heart rate variability (HRV) has become popular thanks to wearables, and it genuinely is a useful indicator of how flexibly your nervous system responds. A higher HRV is associated with better health and greater resilience. The best way to influence your own HRV? Slow breathing is the best-supported approach – and it costs nothing. HRV biofeedback adds modest benefits for stress and anxiety. What HRV is not: a guarantee of heart health or a replacement for blood tests. It is a signal, not a diagnosis. Read more about what HRV tells you at heart rate variability and health.
The bottom line: the hype is manageable, but nuance is everything
The claims around stair climbing and a low resting heart rate are well grounded. Yes, there is a link between gum health and heart health, but whether intervention helps is something we do not yet know. And fish oil? Useful for high triglycerides or elevated risk, but not for everyone – and at high doses, risky for your heart rhythm. The biggest gains do not come from any single supplement or habit, but from the full picture: fitness, inflammation, blood fats and oral health as parts of a larger whole.