Your body hosts trillions of bacteria, viruses, and fungi, collectively known as the microbiome. While some bacteria are linked to disease, many play essential roles in supporting your immune system, heart health, weight management, and overall well-being. This article delves into the significance of the gut microbiome and its impact on health.

What Is Gut Microbiome?

Interestingly, bacterial cells outnumber human cells in the body, with approximately 40 trillion bacterial cells compared to 30 trillion human cells. With up to 1,000 species of bacteria present in the gut, each plays a distinct role. While most bacteria contribute positively to health, some can be harmful. Together, these microbes weigh around 1–2 kilograms, functioning almost like an additional organ essential for overall well-being.

How Does Gut Microbiome Influence Your Health?

The relationship between humans and microbes has evolved over millions of years, with the gut microbiome playing a crucial role from birth. Initial exposure to microbes occurs during birth, and some evidence suggests that exposure begins in the womb. As the microbiome diversifies, it starts influencing key bodily functions:

Digestion of breast milk: Beneficial bacteria like Bifidobacteria help break down essential sugars in breast milk, supporting infant growth.

Fiber digestion: Some bacteria process fiber into short-chain fatty acids, which contribute to gut health and reduce risks of obesity, diabetes, and heart disease.

Immune system regulation: The gut microbiome interacts with immune cells, influencing how the body responds to infections.

Brain health: Emerging research suggests a link between the gut microbiome and brain function, potentially affecting mental health and neurological processes.

Gut Microbiome And Weight Management

An imbalance between beneficial and harmful microbes, known as gut dysbiosis, may contribute to weight gain. Studies on identical twins—one with obesity and the other without—suggest that microbiome composition plays a role in body weight independent of genetics. Additionally, animal studies indicate that gut bacteria can influence weight gain, even when calorie intake remains constant.

Probiotics, beneficial bacteria found in supplements and certain foods, can help restore gut balance and support weight loss, though their effects may be modest.

Gut Health And Disease Prevention

The gut microbiome plays a vital role in preventing and managing conditions like irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD). Imbalances in gut bacteria may lead to bloating, cramps, and digestive issues. On the other hand, beneficial bacteria like Bifidobacteria and Lactobacilli help strengthen the intestinal lining, reducing the risk of gut-related disorders.

Impact On Heart Health

Research suggests that the gut microbiome influences heart health by affecting cholesterol levels and blood pressure. Certain harmful bacteria produce trimethylamine N-oxide (TMAO), a compound linked to blocked arteries and heart disease. However, probiotics, particularly those containing Lactobacilli, may help reduce cholesterol levels and promote cardiovascular health.

Blood Sugar Regulation And Diabetes Risk

The gut microbiome also plays a role in regulating blood sugar levels. Research on infants genetically predisposed to type 1 diabetes indicates that gut microbiome diversity declines before disease onset. Furthermore, individual variations in gut bacteria may explain why people experience different blood sugar responses to the same foods.

Connection Between Gut And Brain

The gut is physically connected to the brain through nerves, and certain bacteria help produce neurotransmitters like serotonin, which influence mood and mental health. Studies indicate that people with mental health disorders often have different gut bacteria compared to those without such conditions. Additionally, some probiotics have shown promise in alleviating symptoms of depression and anxiety.

Tips For Healthier Gut Microbiome

Maintaining a balanced gut microbiome is crucial for overall health. Here are some strategies to support gut health:

• Eat a diverse range of foods: A varied diet rich in fiber, legumes, and fruits promotes microbial diversity.
• Consume fermented foods: Yogurt, kefir, and sauerkraut contain probiotics that enhance gut health.
• Limit artificial sweeteners: Some artificial sweeteners can encourage the growth of harmful bacteria.
• Include prebiotic foods: Bananas, oats, and asparagus contain fibers that nourish beneficial bacteria.
• Breastfeed infants when possible: Breastfeeding promotes a healthier gut microbiome in babies.
• Choose whole grains: Whole grains contain fiber and beneficial compounds that support digestive health.
• Opt for a plant-based diet: Vegetarian diets may reduce inflammation and support a healthier gut microbiome.
• Consume polyphenol-rich foods: Green tea, dark chocolate, and olive oil contain compounds that foster beneficial bacteria.
• Take probiotics if needed: Probiotic supplements can help restore gut balance after disruptions, such as antibiotic use.
• Use antibiotics cautiously: While antibiotics can be life-saving, overuse can harm beneficial gut bacteria.

As December rolls in, familiar melodies float through malls, train stations and sometimes right outside your front door. Carol groups wrapped in tinsel bring a warm sense of nostalgia. Their voices rise in unison, cheerful and bright, filling cold evenings with a comfort that feels almost instinctive. What most people do not realize is that this seasonal tradition may be giving the singers themselves a genuine health lift.

Researchers have been exploring this for years, and their findings suggest that singing is far more than a joyful holiday hobby. It strengthens social bonds, supports emotional wellbeing and even offers physical benefits that reach deep into the brain and lungs.

Why Singing Feels So Good

Alex Street, a researcher at the Cambridge Institute for Music Therapy Research, describes singing as a cognitive, physical, emotional and social act, as reported by BBC. When people sing, especially in groups, the brain lights up in ways few other activities can replicate. Regions responsible for language, movement and emotion get activated at the same time. The steady breathing that singing requires also prompts the release of endorphins, which brings on feelings of pleasure and reduces pain.

Psychologists have long noted how even strangers can develop a sense of togetherness after singing side by side for just an hour. This may explain why community choirs often feel like extended families.

A Simple Workout with Surprising Benefits

Beyond the emotional high, singing demands more from the body than many expect. Studies have shown that it can improve heart rate, circulation and blood pressure. The controlled breathing and longer exhalations strengthen the lungs in ways similar to moderate physical activity. Some researchers even compare a singing session with a brisk walk.

BBC reports that Adam Lewis, an associate professor of respiratory physiotherapy at the University of Southampton, notes that singing encourages people to use their respiratory muscles more efficiently. This is one reason why it has become a useful complementary tool for people living with chronic lung conditions.

Healing Through Harmony

One of the most profound uses of singing is in therapy for people recovering from brain injuries or neurological illnesses. Music therapists often rely on songs from childhood to help patients regain speech or movement. The story of former US congresswoman Gabrielle Giffords is one of the most well known examples, reports BBC. After surviving a severe brain injury, she regained her speech partly through singing familiar melodies during therapy sessions.

Similar approaches have been used with stroke survivors, patients with Parkinson’s disease and people living with dementia. Singing provides repeated vocal practice, encourages focus, and stimulates both sides of the brain. Experts also believe that it may help slow cognitive decline in older adults, although long term studies are still needed.

A Gentle Way Back to Community

For many people living with chronic illness, joining a choir brings something even more meaningful than physical gains. It offers a space where patients, caregivers and professionals participate as equals. Street describes these shared moments as a rare kind of unity that dissolves labels and replaces them with a sense of belonging.

As researchers learn more about the power of song, the message becomes clearer. Singing is not just entertainment. It is a tool for connection, a low cost therapy and a way to strengthen both mind and body. So this festive season, joining a group around the Christmas tree might be more beneficial than you think.

Delhi's Air Quality Index today recorded 'severe' in several location. The Central Pollution Control Board (CPCB) data from 40 monitoring stations from across the city showed AQI above 401 at 7.05 am on Wednesday morning. City's average AQI stood at 376.

While it has only been three days into December, the AQI levels have undergone severe changes. On November 30, Delhi's AQI was recorded at 279, on December 1, it was recorded at 304, while on December 2, the AQI went up to 372.

Amid all this, Dr Ritu Singh, Director Professor and HOD, Department of Biochemistry at Lady Hardinge Medical College posted on her Instagram, what she calls the 'only steps to save your lungs in Delhi".

What Does the Doctor Say?

"If you’re living in Delhi right now, the first line of protection is simple: avoid breathing unfiltered air. If you can’t leave the city, wear an N95 mask every time you step outside or move away from a HEPA-filtered space," says Dr Ritu Singh.

The doctor points out that keeping a high quality HEPA filter at home and at your workplace is essential. She points out that though it may be expensive, but one should know that their "lungs are not replaceable". She says, "Yes, spend all your hard earned money on HEPA filters because the lung is not replaceable."

What Is HEPA Filter? How Does It Help?

As per the US Environmental Protection Agency (EPA), HEPA or also known as the high efficiency particulate air is a type of filter that can theoretically remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (µm). The diameter specification of 0.3 microns corresponds to the worst case; the most penetrating particle size (MPPS). Particles that are larger or smaller are trapped with even higher efficiency. Using the worst case particle size results in the worst case efficiency rating (i.e. 99.97% or better for all particle sizes).

What Else Can Be Done To Stay Safe From Air Pollution?

Dr Singh suggests that indoor plants could be added, though it could only offer a "small but meaningful improvement in air quality".

One famous NASA experiment, published in 1989, found that indoor plants can scrub the air of cancer-causing volatile organic compounds like formaldehyde and benzene.

These plants are:

• Spider Plant
• Snake Plant
• Peace Lilly
• Aloe Vera
• Boston Fern
• English Ivy
• Rubber Plant
• Golden Photos
• Bamboo Palm
• Dracaena

The doctor also recommends that one should increase their intakes of antioxidant foods. "Increase your antioxidant intake—turmeric, amla, oranges—these won’t fix pollution, but they help your body cope with oxidative stress.”

Antioxidants strengthen the immune system by fighting oxidative stress, which is caused by unstable molecules called reactive oxygen species (ROS). The body's normal processes, like breathing and metabolism, create free radicals (ROS). Antioxidants donate electrons to these unstable molecules, which neutralizes them and stops them from damaging healthy cells.

"Right now, the goal is extremely clear: prevent inhalation of polluted air. Delhi’s current levels are dangerous for the lungs, the heart, and the entire respiratory system," the doctor says.

India is only second in the world to have people with chronic kidney diseases in 2023, said The Lancet study. In 2023, China recorded 152 million patients with chronic kidney disease (CKD), while India was at 138 million.

The study, led by researchers from the Institute for Health Metrics and Evaluation (IHME) at the University of Washington, along with collaborators in the U.S. and the U.K., found that CKD was the ninth-leading cause of death worldwide, claiming nearly 15 lakh lives in 2023.

Regionally, the highest prevalence was reported in North Africa and the Middle East (18% each), followed by South Asia (nearly 16%), and more than 15% in Sub-Saharan Africa, Latin America, and the Caribbean.

In fact, senior director and HOD Nephrology at Medanta Kidney and Urology Institute, Dr Shyam Bansal says, "Chronic kidney disease is one of the fastest-growing chronic illnesses in India, mainly because diabetes and hypertension are becoming more common. Diabetes now affects about 10% of the population and hypertension nearly 25%, and together they remain the leading causes of kidney disease."

The report also highlighted CKD’s strong link to heart disease. It contributed to almost 12% of global cardiovascular deaths in 2023 and ranked as the seventh-leading cause of heart-related mortality, ahead of diabetes and obesity.

The researchers outlined 14 key risk factors for CKD, with diabetes, hypertension, and obesity contributing the most to the loss of healthy life. Dietary habits—such as low intake of fruits and vegetables and high sodium consumption, also played a significant role in raising CKD risk.

“Chronic kidney disease is both a major risk factor for other leading causes of health loss and a significant disease burden in its own right. Yet, it continues to receive far less policy attention than other non-communicable diseases, even as its impact grows fastest in regions already facing the greatest health inequities,” said senior author Theo Vos, professor emeritus at IHME.

The findings draw on data from the Global Burden of Disease (GBD) 2023 study, which tracked trends in diseases, injuries, and health risk factors across 204 countries and territories from 1990 to 2023.

Importance of Early Detection Of Chronic Kidney Disease

Importantly, the authors noted that most people with CKD in 2023 were in the early stages, highlighting the urgent need for strong screening programmes and strategies to reduce risk before the disease advances.

This is why its early diagnosis is utmost important. Dr Bansal on the need for early detection says, "“The biggest challenge is identifying people at risk as early as possible. Early diagnosis and timely control of risk factors are essential if we want to slow the progression of chronic kidney disease."

Early detection could also reduce heart-related deaths due to kidney disease and delay one's requirement for replacement therapies, which is usually sought in advanced stages of the disease.

Dr Bansal also points out that early detection could help one live a better life and also in many ways reduce the burden on the Indian healthcare system, and save cost. "We are dealing with a large population at risk, and kidney disease is complex and costly to treat. While infrastructure and specialist availability are improving, managing this growing burden remains a significant challenge," he says.