It’s not all or nothing to improve heart health, new research suggests | Canada Voices

Sleep, physical activity and diet are key lifestyle behaviours that influence the risk of cardiovascular disease and premature death.

Most cardiovascular prevention guidelines – such as recommendations to get at least 150 minutes a week of moderate‑intensity exercise or to follow a healthy dietary pattern like the DASH diet – have been built largely on evidence from studies in which these lifestyle behaviours were examined in isolation.

In real life, though, sleep, physical activity and nutrition are tightly interconnected, with changes in one often affecting the others.

Poor sleep, for example, can disrupt the secretion of appetite hormones, influencing food choices and calorie intake. Lack of sleep can also reduce the motivation to exercise as a result of fatigue.

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Diet, too, can influence sleep quality and energy for physical activity.

Now a new study, published March 26, investigated the relationship between all three lifestyle behaviours simultaneously and the risk of a major cardiovascular event, including heart attack, stroke and heart failure.

Turns out, you don’t need to completely overhaul your lifestyle to improve your cardiovascular health.

According to the findings, making small concurrent changes to daily sleep, physical activity and diet can have a surprisingly positive impact – one that’s at least as powerful as much larger changes to a single behaviour alone.

The latest research

The new study, published in the European Journal of Preventive Cardiology, set out to determine how combined variations in sleep, physical activity and diet influence the risk of heart attack, stroke and heart failure.

The researchers also aimed to identify the minimum combined improvements in these lifestyle behaviours associated with a clinically meaningful reduction in cardiovascular risk.

To do so, they analyzed data from 53,242 UK Biobank participants, average age 63, who were followed for eight years. The UK Biobank is a large-scale biomedical database and research resource containing health-related information from 503,317 participants across the U.K.

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Sleep (hours/day) and moderate- to vigorous- intensity physical activity (minutes/day) were measured using wearable devices.

Diet was assessed through a food frequency questionnaire; the data was then used to calculate participants’ diet quality scores.

The scoring system emphasized a higher intake of vegetables, fruit, whole grains, fish, dairy and healthy oils and a lower intake of refined grains, red and processed meats and sugary beverages.

Scores for each food category ranged from 0 (unhealthiest) to 10 (healthiest) for a total possible diet quality score of 100 points.

The findings

During the eight-year follow-up period, 2,034 major cardiovascular events occurred, which included 932 heart attacks, 584 strokes and 518 heart failure events.

A combined daily increase of as little as 11 minutes of sleep, 4.5 minutes of moderate- to vigorous-intensity physical activity and a modest increase of three diet quality score points (an additional one quarter-cup of vegetables) was tied to a 10 per cent lower risk of a major cardiovascular event.

This was in comparison to people with the lowest levels of sleep (5.5 hours/day), physical activity (7.9 minutes/day) and diet quality score (37 points).

The researchers also identified an “optimal” lifestyle behaviour combination that offered substantial cardiovascular risk reduction.

Compared to the least healthy levels, getting eight to nine hours of sleep per night, at least 42 minutes of moderate- to vigorous-intensity physical activity per day and having a moderate diet quality score was associated with 57 per cent lower risk of major cardiovascular events.

The findings held even after accounting for a wide range of factors, including age, sex, smoking, alcohol use, education, socioeconomic status, medication use and overall health.

Strengths, caveats

The study is credited for analyzing all three lifestyle behaviours together, reflecting how they interact in real life.

As well, sleep and physical activity were measured using wrist‑worn accelerometers, which provide much greater precision than self‑reported data.

By identifying the minimum combined changes in sleep, physical activity and diet linked to a clinically meaningful reduction in major cardiovascular events shifts the emphasis to feasible lifestyle improvements.

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The study’s main limitation was its observational design which can’t prove making these lifestyle changes will directly lower the risk of heart attack, stroke or heart failure.

The researchers noted that multibehaviour lifestyle intervention trials are needed to evaluate the effectiveness of small, achievable lifestyle changes for preventing major cardiovascular events.

Key takeaways

Even so, the new findings are relevant because they show that heart health isn’t all‑or‑nothing.

Small, doable changes in sleep, exercise and diet can add up, making cardiovascular prevention feel more achievable and less overwhelming for many people.

The findings don’t contradict established advice such as exercising regularly or following heart‑healthy eating patterns, though. Instead, they help explain why people may benefit even when they fall short of prescribed targets, and why partial adherence still matters.

What’s more, the findings align closely with guidance from the Canadian Heart and Stroke Foundation and the American Heart Association, which emphasizes that small, sustainable lifestyle changes add up over time and can meaningfully reduce cardiovascular risk.

Heart health improves through cumulative progress, not daily perfection.

Leslie Beck, a Toronto-based private practice dietitian, is director of food and nutrition at Medcan.