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Lights on during sleep linked to obesity and bad health in older adults

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Less than half of the 552 study participants consistently had a five-hour period of complete darkness per day

Older adults exposed to any amount of light while sleeping at night are significantly more likely to be obese, and have high blood pressure and diabetes, according to a real world US study.

A sample of men and women aged 63 to 84 wore a wrist device which tracked and measured light exposure over seven days.

“Whether it be from one’s smartphone, leaving a TV on overnight or light pollution in a big city, we live among an abundant number of artificial sources of light that are available 24 hours of a day.”

That’s according to study corresponding author Dr Minjee Kim, assistant professor of neurology at Northwestern University Feinberg School of Medicine and a Northwestern Medicine physician.

“Older adults already are at higher risk for diabetes and cardiovascular disease, so we wanted to see if there was a difference in frequencies of these diseases related to light exposure at night.”

Cause and effect

Study investigators were surprised to find that less than half of the 552 study participants consistently had a five-hour period of complete darkness per day.

The rest of participants were exposed to some light even during their darkest five-hour periods of the day, which were usually in the middle of their sleep at night.

Because this was a cross-sectional study, investigators don’t know if obesity, diabetes and hypertension cause people to sleep with a light on, or if the light contributed to the development of these conditions.

Individuals with these conditions may be more likely to use the bathroom in the middle of the night (with the light on) or may have another reason to keep the light on.

Someone with foot numbness because of diabetes may want to keep a night light on to reduce the risk of falls.

The study, ‘Light at night in older age is associated with obesity, diabetes, and hypertension’, was published on June 22 in the journal SLEEP.

More darkness

“It’s important for people to avoid or minimise the amount of light exposure during sleep,” said co-senior author Dr Phyllis Zee, chief of sleep medicine at Feinberg and a Northwestern Medicine physician.

Zee and colleagues are considering an intervention study to test whether a restoration of the natural light-dark cycle improves health outcomes such as cognition.

Zee offered tips to reduce light during sleep:

  1. Don’t turn lights on. If you need to have a light on (which older adults may want for safety), make it a dim light that is closer to the floor.
  2. Colour is important. Amber or a red/orange light is less stimulating for the brain. Don’t use white or blue light and keep it far away from the sleeping person.
  3. Blackout shades or eye masks are good if you can’t control the outdoor light. Move your bed so the outdoor light isn’t shining on your face.

Former study

The study participants were originally enrolled in the Chicago Heart Association Detection Project in Industry (CHA), a public health programme and epidemiologic study conducted in 1967-1973 to identify high-risk adults for heart diseases in workplaces throughout the Chicago area.

The study included a detailed examination of known risk factors for heart disease.

Almost 40 years later (2007-2010), Zee and Dr Martha Daviglus, now adjunct professor of preventive medicine at Feinberg, conducted a separate study (Chicago Healthy Aging Study (CHAS)) with 1,395 survivors of the original CHA study who agreed to participate.

They underwent another detailed examination of blood pressure, weight, height, cholesterol, glucose and other known risk factors for heart disease.

In addition, they wore the actigraphy device on their non-dominant wrists for seven days and filled out a daily sleep diary.

Slightly more than half of the actigraphy devices used had the capacity to measure light, which constitute the basis of this new study.

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Shingles vaccine may slow biological ageing in older adults

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Shingles vaccination may slow biological ageing in older adults, research suggests.

The study examined more than 3,800 people aged 70 and older and found that those who received the vaccine showed slower biological ageing on average than unvaccinated individuals.

The study used data from a nationally representative US survey to assess how shingles vaccination related to several measures of biological ageing.

Even when controlling for other sociodemographic and health variables, vaccinated individuals had lower inflammation measurements, slower epigenetic ageing (changes in how genes are switched on or off) and slower transcriptomic ageing (changes in how genes are transcribed into RNA used to create proteins).

The research was carried out at the USC Leonard Davis School of Gerontology, using data from the US Health and Retirement Study.

Shingles, also called herpes zoster, is a painful, blistering skin rash caused by reactivation of the chickenpox virus. Anyone who has had chickenpox is at risk of shingles. While shingles can occur at younger ages, risk is higher for those 50 and older and for immunocompromised people. Vaccination offers protection from shingles and lowers the chance of postherpetic neuralgia, or long-term pain after infection.

While vaccines are designed to protect against acute infection, recent research has highlighted a possible link between adult vaccines, including those for shingles and influenza, and lower risks of dementia and other neurodegenerative disorders, said research associate professor of gerontology Jung Ki Kim, the study’s first author.

“This study adds to emerging evidence that vaccines could play a role in promoting healthy ageing by modulating biological systems beyond infection prevention.”

Biological ageing refers to how the body changes over time, including how well organs and systems are working, unlike chronological ageing, which is simply time passing. Two people who are both 65 years old may look very different inside: one may have the biological profile of someone younger, while another may show signs of ageing earlier.

Kim and coauthor Eileen Crimmins, USC university professor and AARP professor of gerontology, measured seven aspects of biological ageing: inflammation, innate immunity (the body’s general defences against infection), adaptive immunity (responses to specific pathogens after exposure or vaccination), cardiovascular haemodynamics (blood flow), neurodegeneration, epigenetic ageing and transcriptomic ageing. The team also used the measures collectively to record a composite biological ageing score.

Chronic, low-level inflammation is a contributor to many age-related conditions, including heart disease, frailty and cognitive decline. This phenomenon is known as inflammaging, Kim said.

“By helping to reduce this background inflammation, possibly by preventing reactivation of the virus that causes shingles, the vaccine may play a role in supporting healthier ageing. While the exact biological mechanisms remain to be understood, the potential for vaccination to reduce inflammation makes it a promising addition to broader strategies aimed at promoting resilience and slowing age-related decline.”

The effect may persist. When analysing how time since vaccination related to results, Kim and Crimmins found that participants who received their vaccine four or more years before providing their blood sample still showed slower epigenetic, transcriptomic and overall biological ageing on average than unvaccinated participants.

“These findings indicate that shingles vaccination influences key domains linked to the ageing process. While further research is needed to replicate and extend these findings, especially using longitudinal and experimental designs, our study adds to a growing body of work suggesting that vaccines may play a role in healthy ageing strategies beyond solely preventing acute illness.

The work was supported by the National Institute on Aging at the National Institutes of Health. The Health and Retirement Study is supported by the National Institute on Aging.

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Thousands of men in England to be offered life-extending prostate cancer drug

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Thousands of men in England will get the prostate cancer drug abiraterone on the NHS within weeks.

For the first time, patients in England whose cancer has not spread will be able to receive abiraterone as the health service widens access to the treatment.

Around 2,000 men diagnosed in the last three months whose cancer has not spread will get access to the treatment if it is of clinical benefit.

An additional 7,000 men are expected to be diagnosed each year and will be eligible for the drug.

The national clinical director for cancer at NHS England, professor Peter Johnson, said: “For thousands of men with prostate cancer, this treatment option could be life-changing by helping keep their cancer at bay for several years.

“The life-extending treatment available on the NHS within weeks will mean thousands of men can kick-start their year with the news that they will have a better chance of living longer and healthier lives.

“The NHS will continue to work hard to offer people the most effective and evidence-based treatments, with several new prostate cancer drugs rolled over the last five years.”

Abiraterone is a hormone-blocking tablet that helps stop prostate cancer spreading by cutting off the testosterone it needs to grow.

Research has shown that for these earlier-stage patients, survival after six years is improved, with trials showing 86 per cent of men alive after six years on abiraterone compared with 77 per cent on standard treatment (hormone therapy with or without radiotherapy).

NHS England has been able to expand access to the drug for thousands more eligible patients by securing better-value supply, following clinical advice to roll this out last year.

The NHS has set a target to save over £1bn on clinically effective biosimilar drugs during this parliament. Biosimilars are approved, lower-cost versions of biological medicines.

More than eight in 10 drugs the NHS now prescribes are lower-cost biosimilar or generic medicines, creating funding for other treatments.

The NHS in England already commissions abiraterone, now available as a lower-cost generic medicine, for advanced prostate cancer, having introduced a policy to commission the treatment in December 2024, nearly one year ahead of positive NICE guidance recommending it in November 2025.

NHS England has worked with campaigners including Prostate Cancer UK to secure this rollout.

In the past five years alone, the NHS in England has also commissioned targeted prostate cancer therapies, including the branded drugs enzalutamide, darolutamide, relugolix and apalutamide.

The health and social care secretary, Wes Streeting, said: “When you’re living with prostate cancer, every day with your loved ones matters.

“I’m delighted the NHS have taken the steps needed to make the drug available, giving thousands of men access to abiraterone, a treatment that significantly improves survival rates and can give patients precious extra years of life.

“We’re backing the best clinical evidence, making smart funding decisions, and ensuring patients get the care they need when they need it most.

“We’re serious about improving prostate cancer outcomes, treating it faster and giving loved ones more time together.”

In parallel with confirming abiraterone’s commissioning, NHS England will also offer blood plasma treatment for people with the rare condition Clarkson’s Syndrome, and genetic testing for parents with pre-existing conditions going through IVF, following clinical advice and enabled by long-term funding.

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Older male athletes may face increased risk of serious heart problems during exercise

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Veteran male athletes may face higher heart risk during exercise if they have existing heart scarring, new research suggests.

The study found that male endurance athletes aged over 50 were more likely to experience abnormal heart rhythms during training if scarring was present.

Nine in 10 sudden cardiac deaths during sport occur in older male athletes.

Researchers at the University of Leeds tracked 106 healthy male endurance athletes aged over 50 who had been doing more than 10 hours of running or cycling weekly for at least 15 years.

They matched training data from wearables with implantable loop recorders to align heart rhythms with activity.

Over two years, about one in four participants experienced ventricular tachycardia, a fast, abnormal rhythm arising from the heart’s lower chambers, during or just after exercising.

Three quarters of those who had these episodes had heart scarring. There were three sustained episodes during exercise, all in athletes with scarring.

Scarring may be caused by heart attacks, disease or cumulative exertion from years of high-intensity exercise.

Dr Wasim Javed, research fellow at the University of Leeds and lead author, said: “Our study shows that exercise was only associated with a risk of developing abnormal heart rhythms in those who were already high risk due to heart scarring.

“Athletes who developed abnormal heart rhythms were not exercising more or harder than athletes without abnormal heart rhythms.

“This suggests that exercise itself is not the cause, but could act as a trigger for dangerous heart rhythms in those athletes already with an underlying heart issue.”

“Exercise is safe and has immense benefits – but athletes in this group should have regular health checks to make sure they stay healthy.”

The researchers said their findings support the use of wearable technology for athletes who want to monitor their heart rate for unusual activity.

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