It’s Friday, May 15. Today, we’re diving into the big health headlines and breaking down what they actually mean for your daily routine.

On the radar today:

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What's going on: Health officials have said the Andes hantavirus (the strain that caused the MV Hondius outbreak) requires close, sustained contact to spread person to person. Scientists who have studied the virus for decades say that while that’s broadly true, we aren’t acknowledging some inconvenient exceptions. Case in point: In a 2018–19 outbreak in Epuyén, Argentina (the largest characterized outbreak so far), researchers traced 34 cases back to a single man who attended a birthday party for 90 minutes while feverish. Six of those 34 cases had no direct contact with anyone who was ill. One person was infected after a brief passing greeting. 

Some experts believe airborne transmission is the most plausible explanation. The WHO's director general acknowledged to The New York Times that officials have leaned on the “close contact” messaging to avoid panicking people over rarer possibilities. 

What to know: Scientists broadly agree the Andes virus is not highly contagious — only 11 of roughly 150 passengers on the Hondius were infected after weeks in close quarters. As of Thursday, the CDC confirmed no US cases, but 41 people are being monitored — including 18 quarantined in Nebraska and Atlanta, and others who may have been exposed on flights where a symptomatic passenger was present. 

More: Track the outbreak in maps.

🗞️ According to an analysis of data from over 25 million pregnancies published in the Lancet Psychiatry, taking antidepressants during pregnancy has not been seen to increase children's risk of autism or ADHD. Researchers observed that earlier associations between antidepressant use and neurodevelopmental disorders disappeared once researchers accounted for genetic predisposition and pre-existing mental health conditions.

🗞️ A new liver disease called MetALD is surging among young US adults. Coined in 2023, the condition is driven by metabolic risk factors like obesity or diabetes and lifestyle choices like heavy drinking. The share of Americans who meet the criteria has more than doubled since 1990, and nearly 1 in 10 US adults now report overlapping heavy drinking and obesity. It carries a high mortality rate and is frequently missed by routine liver enzyme screenings. STAT covers the story. 

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☀️ Being Optimistic Has A “Bright” Side For Your Health 

Can an attitude adjustment save your heart? A growing body of research suggests the answer is a resounding yes. A new study found that practicing optimism physically alters your cardiovascular health; in fact, consistent exercises dropped systolic blood pressure by up to 8 points and reduced chronic inflammation. Researchers say this shift occurs because chronic pessimism sends stress hormones, inflammation, and insulin resistance through the roof. Conversely, a 2019 study linked a positive outlook to a 35% lower risk of heart disease. It might be time to finally dust off that gratitude journal.

😴 Too Little, Or Too Much Sleep?  

You should aim to clock in between six to eight hours every night. A study of 500,000 adults found that straying outside this window actually accelerates biological aging. While it remains a classic chicken-and-egg riddle (does poor sleep cause aging, or vice-versa?), scientists urge you to prioritize your rest. Fortunately, researchers discovered that abnormal sleep patterns are mostly environmental rather than genetic, meaning your habits are entirely changeable. Here is what the ideal rest looks like….

🥗 A Diet Of Longevity 

Speaking of turning back the clock, a University of Sydney study of 104 older adults found that dietary shifts can yield positive results. Participants moved to a high-carb, lower-fat diet for just four weeks. This change improved cholesterol, insulin, and blood pressure markers enough to constitute a measurable drop in biological age. The winning proportions were roughly 53% carbs, 29% fat, and 14% protein. Researchers note that longer-term studies are still needed to make steady conclusions. But in the meantime, we have something promising!

🖌️ Confused? Good 

Breezing through your daily Sudoku? Well done, but we’ll be the bearer of bad news: your brain might be on autopilot. While puzzles feel productive, the Alzheimer’s Association says they won’t do much for your “cognitive reserve” if your brain already knows the drill. To really stay sharp, you need to be a little bit bad at something. 

Instead, try picking up a cello for the first time or learning conversational French. Better yet, join a class. People who are socially isolated face a 70% higher risk of cognitive decline. Since social circles are shrinking fast, starting a club may be one of the best moves you can make this year.

For The Readers: Three enjoyable ways to slow your brain’s ageing, as per the BBC.

🍎 A Cardiologist Approved Dinner Plate 

Cardiovascular disease affects roughly 75% of adults over age 60, but top cardiologists and cardiac dietitians who spoke to Parade agree that up to 80% of heart disease is entirely preventable through lifestyle choices. When asked to name the single most important component of a heart-healthy dinner, their answer was unanimous: fiber. 

Why? Fiber acts like a sponge in your digestive tract. It actively binds to excess cholesterol in your body. 

Doctor's Order: A simple cardiologist-approved plate consists of grilled salmon, a mountain of roasted zucchini and carrots, and a side of quinoa tossed with pumpkin seeds and a drizzle of olive oil. Season with garlic and rosemary instead of salt. 

Macros: 29g protein | 27g fat | 32g carb | 485 calories (approx. per serving). 

Thanks for reading! At The Blue & Green Letter, we track wellness trends and health essentials every day, bringing you one well-curated update to help you live well and stay informed.

Disclaimer: The information shared here is for educational purposes only and does not constitute medical advice. Our content is sourced from reputable health publications and government data. Readers are encouraged to review the original articles and consult a qualified healthcare professional before making health-related decisions.