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Comment by Dr. Krishna Kumari Challa 2 hours ago

Why a doctor saying 'it's normal' can backfire

A new study suggests that when physicians try to reassure patients by saying their symptoms are "normal," patients may infer that treatment isn't necessary—and become less inclined to seek it. Doctors may think they're saying "Don't panic." But many patients hear "Don't bother" instead.
Doctors use "normal," it seems, to mean common and well understood. Patients often interpret it as meaning acceptable—or not worth treating.
Published in Nature Human Behaviour, the findings of 14 experiments involving 9,371 participants and a wide range of health conditions, from menopause and migraines to dental pain, seasonal allergies and elevated blood glucose levels.

The findings come amid broader conversations about patients feeling dismissed in health care settings, sometimes described as "medical gaslighting." The study identifies a communication gap that may contribute to those experiences, even when doctors are trying to help.

The good news is that miscommunication isn't inevitable. The researchers also tested two simple ways to reduce it: pairing normalizing language with an explicit recommendation for treatment and explaining that "normal" was meant in a statistical, not normative or prescriptive, sense.

Both approaches helped close the communication gap.
The key takeaway for patients: If you're unsure what your doctor means when they say a symptom is "normal," don't assume it means treatment isn't recommended and you should just live with it. Ask.

Common symptoms can still deserve attention—and treatment.

Seyi Lawal et al, Reassurance through normalization inadvertently suppresses treatment, Nature Human Behaviour (2026). DOI: 10.1038/s41562-026-02542-0

Comment by Dr. Krishna Kumari Challa 2 hours ago

One million years without sex fails to erase stick insects' unused biological system
In Timema stick insects reproducing asexually for ~1 million years, X-chromosome dosage compensation remains functional in rare males. Its persistence despite prolonged absence of sexual reproduction indicates that sex-chromosome regulatory mechanisms may not rapidly decay after their original selective role is removed.

Darren J. Parker et al, Dosage compensation and meiotic sex chromosome inactivation are maintained under relaxed selection, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2531501123

Comment by Dr. Krishna Kumari Challa 2 hours ago

Most people are unaware of the environmental effects of sunscreen

UV filter compounds enter the marine environment directly or indirectly. Direct pathways include swimming or other water-based recreational activities, and indirect pathways include washing towels that have been used to dry sunscreen-coated skin, washing off residue during showering and even in urine.

Traditional sewage and water treatment technologies cannot effectively remove most UV filters, and organic UV filters have been reported in 95% of wastewater effluents and 86% of surface waters globally. They have also been detected in marine environments worldwide, from busy tourist locations to remote areas such as Antarctica and the Arctic, highlighting the extent of this contamination.

UV filter pollution has also been linked with agricultural practices, where recycled wastewater and sludge biosolids used as fertilizers can transfer UV filters onto crops and into runoff that eventually reaches rivers and coastal waters.

New research has revealed a striking gap in awareness about the environmental impacts of sunscreen, with more than half of people never having considered that the products they use to protect their skin from the sun's rays could be harmful once they enter the ocean.
That is despite extensive scientific evidence showing that sunscreen ingredients—particularly ultraviolet (UV) filters—can pose a number of risks to marine organisms, including fish, algae and coral reefs.

The research also showed that more than 8 out of 10 people were unaware of the existence of reef-safe sunscreen, an unregulated marketing term often used by brands to imply reduced harm to marine life, despite this not always being the case. This inconsistency is another issue explored within the study.
The researchers say their findings highlight a clear gap between scientific evidence and public awareness and have direct implications for future marine policy and regulation, product labeling and consumer guidance.

That, they add, is because public opinions are essential in encouraging manufacturers to develop choices that balance human and environmental safety.
A key piece of data is that 55% of participants had never considered that sunscreen may be harmful to the marine environment. This demonstrates just how vital clear and accessible communication is in bridging the gap between research and public awareness.
In the study, 281 participants voluntarily responded to a set of five questions on the topic, and 89% reported using sunscreen at some point within the year. However, 81% were unfamiliar with the term reef-safe, and 55% had never considered sunscreens harmful to the marine environment.
The researchers say these findings emphasize the need for clear public messaging and more transparent and regulated product information.

Anneliese A. Hodge et al, User habits and public perceptions of sunscreen pollution: A global review and case study of Britain's Ocean City, Marine Policy (2026). DOI: 10.1016/j.marpol.2026.107244

Comment by Dr. Krishna Kumari Challa 2 hours ago

The researchers then tested the effect in mice by disabling the FNIP1 pathway in the liver. Even when fed a high-fat, high-sugar junk-food diet for up to 30 weeks, these mice were strongly protected against weight gain and fat buildup in the liver.

The results identify FNIP1 as a key player in how the human body manages energy and metabolic biomarkers. Researchers are hopeful that blocking it therapeutically could eventually be used to tackle heart disease, obesity and diabetes.

George Hindy et al, FNIP1 variants are associated with favourable metabolism in 1 million humans, Nature (2026). DOI: 10.1038/s41586-026-10864-2

Part 2

Comment by Dr. Krishna Kumari Challa 2 hours ago

People carrying a rare gene variant have naturally low body fat, healthier livers and better blood sugar levels

There are people around us who can maintain their weight despite what they eat. This has led scientists to believe that a person's metabolism and tendency toward obesity may have genetic factors behind them. A large study sequencing the genomes of more than 1 million people across three continents, found genetic clues that could drive this tendency. The findings are published in Nature.
They used exome sequencing to identify the specific parts of DNA responsible for building proteins, looking for rare gene variants and their associations with the ratio of triglycerides to HDL cholesterol (TG) in the blood (TG: HDL), a marker linked to several heart and metabolic risk factors and diseases.

They pinpointed 59 genes associated with this marker that help regulate how the body balances, stores and burns energy. One of the major players is the FNIP1 (folliculin-interacting protein 1) gene, which essentially acts as a brake on energy expenditure, stopping cells from burning too much energy.

About 1 in 7,000 people carry a rare, naturally occurring genetic mutation that switches off one copy of the FNIP1 gene. This anomaly appeared to come with its share of metabolic advantages, including significant protection against obesity and liver fat, a more favourable distribution of body fat and around 60% lower odds of cardiometabolic disease, among others.
In this study, the researchers built a massive data set that allowed them to identify meaningful patterns in genetic variants associated with healthier metabolism. The team collected genetic data and health records from 1,032,116 people across 11 study groups spanning North America, Europe and Asia.

To read the participants' DNA, they focused specifically on the exome, the 1% of our DNA that contains the instructions for making proteins. Then they looked at TG: HDL in their blood and matched those results with advanced diagnostic data. Using a powerful software program called REGENIE, they searched for genetic variants associated with higher or lower TG: HDL.

The study showed that a simple blood measurement like the TG: HDL ratio, which is the ratio of triglycerides to HDL, the "good" cholesterol, can act as a highly accurate indicator of full-body metabolic health. A higher TG: HDL ratio was strongly associated with excess body fat, dangerous fat buildup around vital organs, insulin resistance and higher blood pressure.

Fifty-nine independent genes were found to directly shape how the body balances energy, stores fat and manages metabolism. Nearly all of them operate in the liver and fat tissue, the body's core metabolic hubs. Of these, 23 genes—close to 40%—already had drugs targeting them, either approved or being tested in clinical trials.

They found that carriers of the rare FNIP1 gene variant had a very healthy metabolic profile. Compared with noncarriers, they showed lower levels of blood fats, including triglycerides and bad cholesterol; lower body weight and body-fat percentage; and a healthier distribution of body fat. They also had lower blood sugar and significantly less fat stored in the liver.
Part 1

Comment by Dr. Krishna Kumari Challa 3 hours ago

A baby's lungs may begin responding to vitamin D sooner than once thought
Many pregnant women around the world are low in vitamin D. This is a very common issue that has prompted inquiries over the years. It is believed that low levels in pregnant women can cause harm to foetal development. Currently, scientists are asking a controversial question. What if the key time for vitamin D effects is before a woman knows that she's pregnant? By week 16 of pregnancy, the structural makeup of their developing airways—that is, the blueprint of breathing—is complete.
This timing begs an interesting question. According to a recent review published in Nutrients, it is not the amount of the nutrient that is important. Rather, it is the timing of the availability of vitamin D.

In short, this is the most important factor that would help us understand childhood asthma. New research suggests that there should be more focus on supplementation during the initial weeks, even before conception. The bulk of the early lung development generally occurs by the time clinical trials first start taking place.
All earlier vitamin D studies were conducted after conception, never before.
A 2025 Cochrane review affirms this trend. The research found that giving a high dose of vitamin D during pregnancy probably protects against wheezing in childhood, though it probably makes "little to no difference" to doctor-diagnosed asthma. Giving more vitamin D to pregnant women lowered wheezing in toddlers on average but did not convincingly prevent an asthma diagnosis.

Notably, these studies pointed out that all these trials started quite late and usually measured vitamin D only once. The researchers say that these designs yield only "weak evidence against the periconceptional hypothesis because they were not designed to test it."
The main takeaway is this: taking vitamin D before pregnancy might matter more than taking huge doses afterwards.

In the early weeks, when the fundamental branches of the lungs are established, it is likely that vitamin D benefits airway programming the most.

The review noted that none of the large trials, in fact, tested giving vitamin D pre-conception or in the first trimester. If timing matters, starting the supplements after 20 weeks may have been too late. The researchers argue that focusing on a higher dose in late pregnancy won't uncover an asthma-prevention effect if it was needed earlier.

Looking to the future, the researchers call for new trials that begin several weeks before conception and continue through early pregnancy. They also suggest measuring vitamin D repeatedly (not just once) and following children longer, with objective lung tests. Such studies could identify if a "vitamin D vacuum" in early pregnancy leaves lungs more vulnerable to asthma.

Oana Raluca Temneanu et al, Timing over Dose: Maternal Vitamin D, Periconceptional Window, and Early-Life Respiratory Programming, Nutrients (2026). DOI: 10.3390/nu18142333

Comment by Dr. Krishna Kumari Challa on Sunday

Brain turns listening inward during REM sleep, EEG recordings suggest
Across wakefulness to phasic REM sleep, EEG responses to external sounds progressively decreased, while responses to heartbeats were preserved or strengthened in 25 participants. This indicates a selective shift from external to internal sensory processing rather than global sensory suppression. An audio–cardiac response index may help characterize altered consciousness.

Sensory processing reallocation from auditory to cardiac signals in REM sleep, Current Biology (2026). DOI: 10.1016/j.cub.2026.07.024

Comment by Dr. Krishna Kumari Challa on Sunday

How to keep the Earth habitable when the sun dies

In a billion years, the sun will start to run out of fuel and expand to become a red giant. Earth's oceans and atmosphere will be burned away, and Earth will likely be engulfed by the sun altogether. The sun will then shrink to a dim white dwarf, and all light and warmth in the solar system will diminish. In a hundred trillion years, the galaxy's ability to produce stars will be exhausted, and everything will turn dark. However, there's a way for life to escape this fate—and what's more, we wouldn't need to leave the planet to do it. We just need to build some safeguards.

A proposed long-term strategy uses a sunshade, artificial fusion power from gas giants, and orbital adjustment to protect Earth during solar evolution. Antimatter-driven core heating could sustain tectonics, while directed mass beams could alter Solar System motion. The concept remains highly speculative and requires extreme resources.

Gabriel Harry, Retaining Earth's Habitability Beyond the Life of the Sun, Journal of the British Interplanetary Society (2026). DOI: 10.59332/jbis-079-07-0230. On arXiv: DOI: 10.48550/arxiv.2607.13084.

Comment by Dr. Krishna Kumari Challa on Saturday

Brain activity reveals two stages of visual processing before conscious perception
EEG decoding indicated early occipital activity (~200 ms) encoding individual visual offsets and their temporal order without conscious separation. Later central-parietal activity (~450 ms) represented the integrated percept and behavioural reports, consistent with sequential unconscious encoding followed by conscious visual integration.

Maëlan Q. Menétrey et al, Sequential neural dynamics underlie unconscious integration and conscious perception of visual stimuli, PLOS Biology (2026). DOI: 10.1371/journal.pbio.3003894

Comment by Dr. Krishna Kumari Challa on Saturday

Meta says its AI model hacked another company, adding to worries about bots going rogue
A Meta AI model gained unintended internet access during cybersecurity testing and exploited a third-party vulnerability; the incident is under investigation. Related tests reported unsanctioned online actions by AI agents under reduced safeguards, highlighting containment needs for cyber-capability evaluations.
source: News agencies

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