What's the connection between gut microbes and heart? Cardiology expert explains

Cardiac emergencies are no longer confined to those in their sixties or seventies. Today, hospitals are witnessing an alarming influx of patients in their thirties and forties, and even teenagers, requiring urgent treatment for heart disease. This disturbing trend indicates a fundamental shift in our daily environments and routines. While conventional advice focuses on reducing salt intake and walking more, we must look closer at the emerging, often overlooked catalysts of modern heart disease. Dr Vivek V Pillai, Professor and Head of Cardiovascular and Thoracic Surgery at Sree Chitra Tirunal Institute of Medical Sciences and Technology in Thiruvananthapuram, explains.

The post-COVID cardiovascular shadow
Years after the pandemic's peak, the legacy of COVID still lingers in our blood vessels. The viral infection has been linked to myocarditis (inflammation of the heart muscle) and an increased tendency for blood clotting. Consequently, the risk of heart attacks and strokes can remain elevated for months after a patient has recovered from the active infection. Data from both Indian and international heart registries show a sharp rise in cardiovascular events following the pandemic, often affecting individuals with no previous history of cardiac illness. If you or a family member experienced a moderate-to-severe COVID infection, it is vital to inform your doctor during medical check-ups, especially if you experience persistent shortness of breath, a rapid heart rate, or unexplained fatigue.

Screens, stress, and silent overload
Two major risk factors rarely discussed in traditional heart-health circles are excessive social media use and chronic psychological stress. The two are deeply intertwined. Constant, mindless scrolling keeps the body's sympathetic nervous system in a state of high alert. This fight-or-flight mechanism, designed for short-term survival, releases a steady stream of cortisol and adrenaline when chronically activated. This elevates blood pressure, disrupts sleep patterns, and often triggers late-night snacking. Teenagers are particularly vulnerable to this cycle. Research associates excessive screen time in adolescents with poor sleep quality, anxiety, and early signs of hypertension. When coupled with the emotional stress of social comparison, cyberbullying, and reduced quality time with family, we are raising a generation whose hearts are working overtime long before physical arterial blockages even begin to form.

The solution is not to demonise technology, but to establish boundaries. Families can create screen-free zones at home, agree to keep devices away during meals, and switch off all screens at least an hour before bedtime. Reviving simple habits, such as gathering for a shared family conversation or quiet reflection, can help lower collective stress levels for both adults and children.

The silent destroyers
While the dangers of smoking and alcohol are widely recognised, newer habits pose equal threats to the vascular system. Vaping, e-cigarettes, recreational stimulant use, and the consumption of smokeless tobacco mixed with betel nut are highly hazardous. These habits trigger sharp spikes in blood pressure, damage the delicate endothelial lining of blood vessels, and increase the risk of acute blood clots.

Sedentary habits, sugar, and carbs: The regional challenge
Diets heavily reliant on polished white rice and refined foods are high in calories but severely lacking in dietary fibre. When combined with sedentary desk jobs, school systems that do not prioritise physical education, and the easy availability of processed, deep-fried snacks, conditions like obesity, diabetes, and fatty liver disease become almost inevitable. All of these are potent accelerators of cardiovascular risk.

Simple, conscious dietary swaps can make a profound difference. Try replacing polished white rice with brown rice, ragi, jowar, or other millets for at least one meal a day. Incorporating more fresh vegetables, pulses, and lean proteins is equally beneficial. Additionally, aim for at least 150 minutes of moderate exercise each week. Incorporating simple habits like walking to local places of worship, opting for the stairs instead of the lift, or taking a dedicated thirty-minute daily walk can significantly lower your risk profile.

Microplastics and gut health: the new frontiers of research
Recent scientific breakthroughs have illuminated two emerging areas of concern for heart health. First is the alarming presence of microplastics. Recent clinical studies have detected microplastic particles embedded directly within the arterial plaque of patients undergoing vascular surgery. These patients were found to have a significantly higher risk of future heart attacks and strokes. While research continues, we can take immediate steps to minimise our exposure: avoid heating food in plastic containers, reduce the use of single-use plastic bottles, and ensure drinking water is properly filtered.

The second area of focus is the gut microbiome. The vast community of microbes living in our digestive tract exerts a powerful influence on cardiovascular health. A diet heavy in red meat and ultra-processed foods promotes gut bacteria that produce a compound called TMAO (trimethylamine N-oxide), which is known to stiffen and clog arteries. Conversely, a fibre-rich diet abundant in vegetables, fruits, and fermented foods like yoghurt nurtures beneficial gut bacteria that actively protect the heart.

Take charge of your heart health
If you are over thirty, ensure you screen your blood pressure, blood sugar, and cholesterol levels at least once a year. Those with a family history of heart disease should start these routine screenings even earlier. Aim for a brisk thirty-minute walk at least five days a week. Crucially, never ignore warning signs such as chest discomfort, unusual breathlessness, or episodes of fainting, and avoid self-medicating. Prompt medical intervention not only saves lives but also prevents the need for complex, invasive treatments later on.

Modern cardiology offers an array of highly sophisticated interventions, ranging from advanced medications for blood pressure and cholesterol control to angioplasty, bypass surgery, and structured cardiac rehabilitation. Technological advancements now allow surgeons to perform precise, robotic-assisted keyhole surgeries that minimise scarring and blood loss, enabling patients to return to their normal lives much faster. However, prevention remains infinitely better than cure. Our hearts beat more than a hundred thousand times a day without asking for anything in return. Let us make a conscious commitment to foster healthier lifestyle habits in ourselves and the younger generation. Whether it is scheduling a long-delayed medical check-up, taking a screen-free evening walk with family, or simply talking openly with a stressed teenager, these small, intentional steps can secure a healthier future for our hearts.