A new study published in The Lancet Digital Health suggests that biological age of different organs could predict a person's risk of diseases such as cancer, dementia, and heart disease than their actual chronological age. The research analyzed long-term data from Whitehall II study, which had been followed by over 10,000 British adults for more than 35 years.

The blood plasma samples were collected between 1997 and 1999 from participants between ages 45 to 69. Researchers have now examined a follow up data from 6,235 participants, who were by then aged 65 to 89. This was done to see how aging of specific organ may correlate with the development of diseases over two decades.

What Organs Were Studied?

The study measured the biological age of nine key organs, including:

• Heart
• Blood vessels
• Liver
• Immune system
• Pancreas
• Kidneys
• Lungs
• Intestines
• Brain

The researchers were able to find that different organs aged at different rates in different people. In many of the cases multiple organs showed signs of faster aging within the same individual. What is important to note is that those with accelerated aging in certain organs had a higher risk of developing 30 out of the 40 age-related diseases the study had tracked.

Organ Aging And Disease Risk

Some organ-disease connections were expected—people with rapidly aging lungs were more likely to develop respiratory diseases, and those with aging kidneys had an increased risk of kidney-related conditions. However, the study also found less obvious associations.

For example, individuals with fast-aging kidneys were more prone to diseases in other organs, such as the liver and pancreas. Additionally, multiple fast-aging organs were linked to an increased risk of kidney disease.

One of the most surprising findings was that dementia risk was not best predicted by an aging brain but rather by the immune system’s biological age. This suggests that factors such as chronic inflammation and immune health may play a critical role in neurodegenerative diseases.

What Is Organ Specific Blood Tests?

The study also highlights the important of the potential of developing blood tests that could assess the biological age of specific organs. Unlike previous complex methods that measured the organ health, this new approach could make things simple to detect early signs of disease.

The leader author of the study Mika Kivimaki, who is also a professor at the University College London's Faculty of Brain sciences pointed out that such tests could be helpful when it comes to guiding personalized healthcare. In a news release, Kivimaki said, "They could advise whether a person needs to take better care of a particular organ and potentially provide an early warning signal that they may be at risk of a particular disease."

The study reinforces the idea that aging does not affect all organs equally and that looking beyond chronological age could offer better insights into disease prevention. By understanding which organs are aging more rapidly, medical professionals may be able to recommend targeted interventions for individuals at higher risk of specific conditions. Future advancements in organ-specific blood testing could revolutionize how we detect and manage age-related diseases, potentially leading to more personalized healthcare strategies.

It has been long suspected that Western diets could contribute to the risk of colorectal cancer. The theory may finally have a clearer scientific explanation.

A new study suggests that gut bacteria can convert compounds produced by high-fat, low-fibre diets into cancer-causing chemicals. The research sheds light on how unhealthy eating habits may lead to cancerous tumour growth in colon in the long term.

What Did The Study Find?

Published in the journal Gut, the research was led by Dr. Annika Osswald (first author) and Dr. Soeren Ocvirk (corresponding author), along with a large team of international scientists.

The collaboration included researchers from Technical University of Munich (TUM), Germany, German Institute of Human Nutrition (DIfE), RWTH Aachen University, Freie Universität Berlin, University Hospital of Regensburg, and other institutions.

Researchers found that a western-style diet, which is commonly high in red and processed meat, saturated fats, refined carbohydrates and ultra-processed foods, significantly changes the composition of the gut microbiome.

These altered bacteria then modify bile acids in ways that promote inflammation and create an environment that accommodates the development of colorectal cancer tumours.

According to the researchers, diet alone is not the only factor. The trillions of microbes living in the intestine determine how food is processed, producing metabolites that can either protect the gut or damage it.

The study found that specific bacterial groups transformed bile acids into compounds that stimulated tumour growth in the colon.

This provides one of the strongestt explanations yet for why western dietary patterns have consistently been associated with higher risk of colorectal cancer.

"Our findings highlight the critical interaction between diet, gut microbes and cancer biology," the researchers noted, adding that targeting the microbiome could become a future strategy for preventing colorectal cancer.

Also read: Why English Actor Peter Duncan Is Advocating For Focal Therapy After His Prostate Cancer Treatment?

Negative Effects Of Western Diet

A western diet typically includes:

• High amounts of processed and red meat
• Fried foods and saturated fats
• Sugary drinks and desserts
• Refined grains
• Low intake of fruits, vegetables, legumes and whole grains

Previous research has repeatedly linked this eating pattern with obesity, diabetes, heart disease and colorectal cancer, but scientists have long found it challenging to explain the exact cause until now.

Also read: AI-Powered Blood Test Detects Liver Cancer Across Diverse Populations, Shows Promise In Earlier Diagnosis

Importance Of Gut Microbiome

The human gut is home to trillions of bacteria that help digest food, regulate immunity and produce beneficial compounds like fatty acids.

A fibre-rich diet supports good bacteria that reduce inflammation, whereas diets high in fat and processed foods can cause microbial imbalance.

The new findings suggest this imbalance changes how bile acids are metabolised, increasing the production of molecules capable of damaging the colon and supporting cancer growth in the long run.

Also read: WHO Cancer Agency Flags 3 Common Medicines As Carcinogenic: What It Means For Millions Of Patients

Colorectal Cancer Is Rising Among Younger Adults

Earlier research has linked harmful gut bacteria, including toxin-producing E. coli, with DNA damage that may begin early in life and contribute to the rise of colorectal cancer among younger people.

However, the latest findings do not prove diet alone causes cancer. Genetics, obesity, physical inactivity, sedentary life, smoking and alcohol consumption also influence risk.

However, they say maintaining a fibre-rich diet with fruits, vegetables, legumes and whole grains may help preserve a healthier gut microbiome and lower long-term colorectal cancer risk.

Could air pollution may do more than harm the lungs and heart? A new study has found that exposure to polluted air could trigger painful flare-ups in people living with rheumatoid arthritis (RA).

The study comes when evidence is mounting that environmental factors contribute significantly to autoimmune diseases.

About The Research

The study, published in the Annals of the Rheumatic Diseases, found that excessive exposure to air pollutants, particularly fine particulate matter (PM2.5), was associated with increased rheumatoid arthritis activity and a greater risk of flare ups.

Researchers say the findings suggest that improving air quality should become an important part of managing the chronic condition, alongside treatment, medications and lifestyle changes.

"Our findings highlight that environmental exposure, especially air pollution, may significantly influence rheumatoid arthritis disease activity and flare risk," the researchers said, noting that patients and clinicians should consider air quality as a modifiable risk factor.

Also read:

About Rheumatoid Arthritis

Rheumatoid arthritis is an autoimmune disease in which the immune system attacks healthy joints, causing pain, swelling, stiffness and, over time, permanent joint damage.

While genetics, smoking and infections have been recognised as risk factors, scientists are investigating how environmental pollutants may worsen the disease.

The latest findings are particularly relevant for countries such as India, where millions are exposed to unhealthy air for large parts of the year. Previous reports have already linked poor air quality in cities like Delhi to rising concerns over autoimmune diseases.

Also read: Severe COVID-19 Can Reactivate Dormant Viruses, May Fuel Long COVID Symptoms: Study

A flare is a period when rheumatoid arthritis symptoms suddenly worsen. During this time, people may experience:

• Severe joint pain and swelling
• Morning stiffness lasting longer than usual
• Fatigue and weakness
• Difficulty performing everyday tasks

Flares can last from a few days to several weeks and are often triggered by infections, stress, missed medications or other environmental factors.

Researchers believe tiny airborne particles like PM2.5 can enter the lungs and bloodstream, triggering inflammation throughout the body.

This inflammatory response may overstimulate the immune system, making rheumatoid arthritis symptoms worse and increasing the likelihood of painful flare-ups.

Also read:

Is There More Evidence?

The researchers emphasised that the study shows an association rather than proving that air pollution directly causes rheumatoid arthritis flares.

However, the consistent link suggests reducing exposure to polluted air may help lower the chances of flare-ups in high-risk individuals.

Experts advise patients to continue prescribed medications, constantly monitor local air quality, avoid outdoor activities during periods of severe pollution when possible, and discuss symptom changes with their rheumatologist.

The findings add to a growing body of research linking air pollution with autoimmune diseases.

Earlier studies have suggested that long-term exposure to pollutants may increase the risk of developing rheumatoid arthritis, while the new research indicates polluted air may also worsen symptoms in people already living with the disease.

Commonly prescribed medicines for high blood pressure and heart disease could also help antidepressants work better, according to a new study by researchers at the All India Institute of Medical Sciences (AIIMS).

The research offers hope for people with depression whose condition is not adequately managed with standard antidepressants.

About The Study

The study found that certain cardiovascular medications, when taken along with antidepressants, may improve the brain's response to treatment, potentially making clinical depression treatments more effective.

The findings establish a foundation for repurposing common medicines to improve mental health treatment. The researchers stress that larger clinical trials are needed to validate the study before it can be included in standard depression treatments.

"Our findings suggest that some drugs already being used to treat hypertension and heart disease may have the potential to act as adjuncts to antidepressant therapy," the AIIMS research team said.

They also said that the strategy could particularly benefit patients who do not respond to antidepressants well.

Also read: NBA Star Kevin Love Says Robin Williams Changed How He Sees Depression; Here's Why Symptoms Often Get Missed

How Can The Findings Help?

Even though depression affects hundreds of millions of people worldwide, almost one-third of patients do not receive adequate relief from their first antidepressant.

Even when medications work, they often take several weeks to show results. This has led researchers to explore more ways to improve treatment outcomes, especially for mental health issues.

Repurposing existing medicines is considered an attractive strategy because their safety profiles are already well understood, potentially reducing the time and cost needed to bring new treatment options into clinical practice.

Also read: Mental Health Crisis In Israel Military: Why Suicides Among Soldiers Are Increasing?

How Could Heart Medicines Improve The Efficacy Of Antidepressants?

Antidepressants, including selective serotonin reuptake inhibitors (SSRIs), are among the most commonly prescribed medicines for moderate to severe depression. They work by changing the levels of neurotransmitters like serotonin in the brain, helping regulate mood over time.

However, individual responses may vary widely, and many patients end up needing multiple treatment approaches before achieving any relief.

While the exact biological mechanisms are still under investigation, researchers believe that some cardiovascular drugs may have an effect on pathways associated with inflammation, blood flow to the brain, or nerve signaling, all of which are increasingly play a role in depression treatment.

The researchers noted that these medicines are not intended to replace antidepressants. Instead, they could eventually be used alongside standard treatment to improve its effectiveness in some patients.

Also read: IIT Delhi, AIIMS Develop First Hindi Music Therapy for Stroke Patients: How Survivors Find Their Voice

Word Of Caution

Experts caution that patients should not start or stop blood pressure or heart medications in the hope of treating depression without clinical supervision.

More clinical studies are required to identify which cardiovascular drugs offer the greatest benefit, which patients are most likely to respond, and whether the combination remains safe over long-term use.

The AIIMS study could pave the way for a cost-effective strategy to improve depression treatment by giving a new role to medicines that are already widely available.