Research over the past two decades has increasingly highlighted a significant connection between the gut microbiome and cardiovascular health, a relationship often referred to as the gut–heart axis. This connection involves the complex interaction between the trillions of bacteria residing in the intestines and the cardiovascular system, influencing factors such as blood vessel function, cholesterol metabolism, and inflammation.

The British Heart Foundation has been at the forefront of this research for the last five years, promoting dietary strategies that leverage this connection to improve heart health. Dell Stanford, senior dietician at the charity, explains that the gut bacteria metabolize undigested food in the large bowel, producing compounds that enter the bloodstream and impact cardiovascular risk. She notes that diet plays a crucial role in determining whether these effects are beneficial or harmful. For example, diets high in fatty red meat may increase the production of inflammatory compounds linked to heart disease, whereas fiber-rich diets support gut bacteria that promote heart health.

Stanford recommends six sustainable dietary changes to reduce cardiovascular disease risk. These include increasing the intake of fruits and vegetables, choosing wholegrain carbohydrates over refined options, replacing saturated fats with unsaturated fats, incorporating pulses and plant-based proteins, reducing salt consumption, and staying well-hydrated while cutting back on sugary drinks and alcohol.

She emphasizes that replacing saturated fats with unsaturated fats is particularly beneficial for heart health. Saturated fats are commonly found in foods such as butter, lard, fatty and processed meats, as well as many baked goods, while unsaturated fats are present in avocados, nuts, seeds, oily fish, and certain vegetable oils like olive and rapeseed oil. Using unsaturated fats instead of saturated fats can help lower cholesterol levels.

In terms of salt intake, Stanford highlights that most dietary salt comes from processed foods rather than added table salt. Therefore, reading food labels and selecting lower-salt options can significantly reduce overall consumption. Additionally, while tea and coffee can be included in a healthy diet, it is advisable to limit sugary additives. Alcohol should be consumed in moderation, with periodic alcohol-free days recommended to support cardiovascular health.

Adopting these changes could substantially decrease the burden of cardiovascular disease on the UK healthcare system, potentially lowering the £10 billion annual cost to the National Health Service currently spent on related treatments. The emphasis on small, manageable lifestyle adjustments underscores the potential for meaningful improvement in heart health through diet.