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.

More than 57 million people worldwide are living with dementia, a number expected to triple to over 152 million by 2050. While there is still no cure, growing evidence suggests that healthy lifestyle changes can help improve brain health and preserve cognitive function in older adults at risk of dementia.

A major study published in The Lancet suggests that adopting healthy lifestyle habits can significantly improve memory and thinking skills in older adults at risk of dementia.

The study found that a culturally adapted, structured lifestyle program delivered across 11 Latin American countries produced meaningful improvements in cognitive function over two years. Participants in the intensive program showed 55 per cent greater improvement in overall cognition than those who received general health advice.

Lead author Lucia Crivelli, principal investigator at Fleni, a neurological institute in Buenos Aires, Argentina, said culturally adapted lifestyle interventions can be successfully implemented across diverse communities and "deliver cognitive benefits" for people at risk of dementia.

"Addressing multiple lifestyle factors can positively impact brain health and may eventually be combined with emerging drug therapies to reduce cognitive decline and dementia risk," added Heather M. Snyder, senior vice president of medical and scientific relations at the Alzheimer's Association.

What Did The Study Find?

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The clinical trial enrolled 1,065 adults aged 60 to 77 years at increased risk of cognitive decline across 12 sites in Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, the Dominican Republic, Ecuador, Mexico, Peru and Uruguay.

Participants were randomly assigned to one of two groups. The Systematic Lifestyle Intervention (SLI) group received ongoing coaching, supervised exercise, personalized nutrition counselling, cognitive training and regular monitoring of cardiovascular risk factors. The Flexible Lifestyle Intervention (FLI) group received general lifestyle recommendations through periodic health education sessions without continuous coaching or supervision.

The structured program combined supervised exercise, a brain-healthy MIND diet, computer-based cognitive training, regular monitoring of blood pressure, blood sugar and weight, and social engagement activities designed to encourage accountability and interaction.

To improve participation, the intervention was adapted to local cultures. Exercise sessions incorporated familiar activities such as salsa and tango, while nutrition counselling focused on regionally available foods including avocado, quinoa, açaí, chia seeds, pumpkin seeds and aguaymanto.

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After two years, participants in the structured intervention experienced:

• 55 per cent greater improvement in overall cognitive performance than those in the flexible intervention group.

• The largest gains in memory.

• Significant improvements in executive function, including planning and decision-making.

• Faster processing speed.

The cognitive benefits were consistent regardless of participants' age, education level, ethnicity or genetic risk for Alzheimer's disease.

The authors noted that while the program improved performance on cognitive tests, it did not determine whether the intervention prevents dementia. They said longer-term follow-up is needed to establish whether these cognitive improvements ultimately reduce the risk of developing the disease.

What Is Dementia?

Dementia is an umbrella term used to describe a significant decline in mental function that is serious enough to affect everyday life. It commonly impacts memory, thinking, and reasoning skills. Dementia itself is not a single disease but a collection of symptoms caused by underlying conditions such as Alzheimer’s disease or vascular dementia.

Common signs include

• memory problems,
• confusion,
• difficulty finding words,
• changes in mood or behavior,
• trouble completing familiar tasks.

Nearly one in five women aged 50 and older in the United States has osteoporosis, a bone disease that weakens bones and increases the risk of fractures. Yet many women remain undiagnosed because the condition often develops without noticeable symptoms in its early stages.

To improve early detection, the updated recommendations from the US Preventive Services Task Force (USPSTF) advise routine osteoporosis screening for women aged 65 years and older.

The task force also recommends that postmenopausal women younger than 65 undergo a risk assessment to determine whether they should receive a bone density scan.

Updated USPSTF Screening Recommendations

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The USPSTF recommends:

• Women aged 65 years and older should undergo routine screening with a bone density scan.
• Postmenopausal women younger than 65 should first complete a risk assessment questionnaire to determine whether a bone density scan is needed.

Women under 65 may need screening if they have one or more risk factors, including:

• Low body weight
• Family history of hip fractures
• Cigarette smoking
• Excessive alcohol consumption

"Screening is important because osteoporosis causes bones to become weaker and fracture more easily, leading to disability, chronic pain, loss of independence, and even death,” said Task Force member Dr. Esa Davis, professor of family and community medicine at the University of Maryland, Baltimore, NBC reported.

Why Osteoporosis Often Goes Undetected

Osteoporosis is often called a "silent disease" because it usually causes no symptoms until a bone breaks. Many people only discover they have osteoporosis after experiencing a fracture. The most common fracture sites include the:

• Hip
• Wrist
• Spine

Why Osteoporosis Is More Common In Women

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According to the US Centers for Disease Control and Prevention (CDC), data from 2017-2018, published in 2021, showed that:

• 19.6 per cent of women aged 50 and older had osteoporosis in the femur or lower spine.
• In comparison, 4.4 per cent of men had osteoporosis.

The study also found that osteopenia—a condition of lower-than-normal bone density that often precedes osteoporosis—was more common in women than men. While osteopenia affected 51.5 per cent of women, it affected 33.5 per cent of men.

In women, osteoporosis is commonly linked to the hormonal changes that occur after menopause.

Estrogen plays an essential role in building and maintaining strong bones. After menopause, estrogen levels decline significantly, accelerating bone loss and increasing the risk of osteoporosis.

People who do not build strong bones during childhood and early adulthood are also at greater risk later in life. Factors such as lack of physical activity, eating disorders, and certain health conditions can prevent the body from achieving optimal bone mass during the younger years.

What Is Osteoporosis Screening?

Doctors use imaging tests to measure bone density and diagnose osteoporosis. A DXA (dual-energy X-ray absorptiometry) scan is the standard diagnostic test and measures bone density in the spine, hip, and wrist using a very small amount of radiation.

Ultrasound can also assess bone quality, but it is not used alone to diagnose osteoporosis. If ultrasound findings suggest bone loss, a DXA scan is still required to confirm the diagnosis.

Is Osteoporosis Treatable?

There is currently no cure for osteoporosis, but treatment and lifestyle changes can help slow bone loss and reduce the risk of fractures.

Experts recommend:

• Stay physically active and do weight-bearing exercises such as walking.
• Do not smoke.
• Limit alcohol consumption.
• Get enough calcium and vitamin D through your diet. Your healthcare provider may also recommend calcium and vitamin D supplements if needed

Thanks to growing popularity of complex and elaborate skincare trends on social media, perfect skin has become the ultimate beauty goal for many teenagers.

But experts are warning that this obsession is fueling a worrying condition known as cosmeticorexia, where young people use anti-aging and active skincare products far beyond what their skin needs, increasing the risk of irritation, allergies, and long-term damage.

When Skincare Turns Into Skin Damage

Teenagers and even younger children suffer from severe skin damage, chemical burns, and dermatitis. The cause of this issue is not a common medical condition but a reflection of an unhealthy trend called cosmeticorexia (dermorexia).

This dangerous obsession pushes people to treat their skin as an unacceptable defect that needs to be constantly adjusted, filed, tightened, peeled, and made younger.

Social media and anti-aging marketing culture promote this disorder by encouraging adolescents to use various comedogenic creams, serums, and toners with harmful effects on sensitive and fragile skin. Thus, millions of teenagers damage their skin beyond repair before it naturally matures.

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Why Teen Skin Is More Vulnerable

There are multiple concerns about the health of teenage skin from a medical perspective. The skin of adolescents is thinner and more sensitive to external influences.

In addition, teenagers' skin is subject to increased sebum production and associated risks of comedones, blackheads, and dermatitis.

The Hidden Risks Of Trendy Skincare Products

The use of "cosmeceuticals" or prescription drugs with neurotoxins, retinol, AHA (glycolic acid), and vitamin C can accelerate skin damage when used inappropriately.

Recent research has shown that the standard skincare regimen of a teenager who follows social media and beauty vloggers includes more than eleven irritating substances. Topical application of such a combination of cosmetics damages the upper layer of the skin, provoking allergic reactions, dermatitis, redness, and irritation.

Moreover, the use of retinol and AHA (glycolic acid) without medical supervision may lead to photosensitivity, increasing the risk of UV-induced skin damage. Finally, an increasing number of cases of allergic contact dermatitis are linked to synthetic and harmful substances found in luxury cosmetic products.

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Cosmeticorexia: A Psychological And Skin Health Disorder

Cosmeticorexia is an example of a psychodermatological disease, where psychological problems manifest through dermatological conditions.

The constant pursuit of flawless skin can lead adolescents to adopt harmful skincare practices that ultimately damage their skin rather than improve it.

The Right Skincare Routine For Teenagers

From a medical point of view, the role of healthcare providers is to combat this dangerous trend by addressing its immediate consequences.

Teenagers' skin does not require anti-aging treatments or additional nourishment. The only essential skincare routine includes three simple steps: gentle cleansing, applying a non-comedogenic moisturizer, and using a hydrating sunscreen every day.

Protecting Teens From Harmful Beauty Trends

Doctors, parents, educators, and social media platforms must work together to counter the anti-aging industry's growing influence on teenagers.

Raising awareness about age-appropriate skincare and discouraging unnecessary cosmetic treatments can help protect young people from avoidable chemical damage and long-term skin problems.

By Dr Gaurav Garg Dermatologist & Hair Expert, Founder, Dermalife Skin Hair Clinic