HEALTH NEWS Eating walnuts daily may boost mood and shift serotonin-related metabolism Higher daily step counts linked to fewer mental health problems in early adolescence, study finds How dementia risk and heart failure is being linked to dreaming Sardinian village may be a new longevity hotspot New study shows any healthy eating plan slows aging Eating walnuts daily may boost mood and shift serotonin-related metabolism University of Barcelona (Spain), October 2 2026 (News-Medical) In a recent study published in Food & Function, researchers evaluated whether 8 weeks of walnut consumption affects mood states in young adults and whether these effects are associated with urinary 5-hydroxyindoleacetic acid (5-HIAA), cortisol, and urolithin levels. Serotonin is a neurotransmitter involved in mood regulation and is produced from the dietary amino acid tryptophan. Its main metabolite, 5-HIAA, can be measured in urine as an indicator of serotonin metabolism. Walnuts are rich in omega-3 fatty acids, tryptophan, fiber, and polyphenols, including ellagitannins that gut microbiota convert into urolithins. These metabolites may indicate walnut intake and biological responses; however, further research is needed to clarify how walnut consumption relates to mood and metabolic pathways. The study used an 18-week open-label randomized crossover trial involving adults aged 20–35 years. Participants were randomly assigned to consume 40 g of walnuts per day with dinner or to refrain from nuts and nut products for the next 8 weeks. After a 2-week washout period, participants crossed over to the alternate condition. During the walnut condition, total mood disturbance was 4.85 points lower than during the control condition. Anger and fatigue also decreased. Two trait food-craving domains showed initial reductions: anticipation of relief from negative states and feelings after eating and guilt associated with cravings or giving in to them. Urinary 5-HIAA increased significantly during walnut consumption, while urinary cortisol did not differ significantly between conditions. Higher urinary 5-HIAA was associated with lower total mood disturbance. The paper also reports an association with lower fatigue. Higher daily step counts linked to fewer mental health problems in early adolescence, study finds King's College London, October 1 2026 (Eurekalert) A study of more than 5,500 adolescents in the US found that those who took more daily steps at age 11 to 12 had fewer mental health problems a year later. The more adolescents walked, the fewer mental health problems they had a year later, and the benefit didn't level off at any point the researchers could measure. Teenagers who took under 5,000 steps a day had the most symptoms; those averaging around 8,000 had fewer; and those hitting 12,000 or more had the fewest of all. Adolescents with the highest step counts also showed slightly thicker brain tissue in two areas involved in movement and in regulating emotion, and this difference helped explain part of the link to better mental health. How dementia risk and heart failure is being linked to dreaming Peking University (China), September 29, 2026 (NaturalHealth365) How much of last night did you actually spend dreaming? Most people have no idea. Until recently, most sleep researchers didn’t either, since large studies relied on people guessing how well they slept. Now, wrist trackers worn by more than 95,000 adults have put real numbers on those hours. The results reach far beyond feeling rested in the morning, because one sleep stage lined up with lower risk for 83 separate diseases. Over a median follow-up of 8.9 years, the team checked those sleep patterns against more than 1,000 diseases in participants’ health records. REM sleep, the stage when most dreaming happens, stood out above everything else. For roughly every extra 48 minutes of REM, dementia risk fell by 46% and heart failure risk dropped by 26%. Even more striking, Parkinson’s disease risk was 80% lower. Total hours were only part of the picture. Participants who woke up often during the night faced a higher risk of several conditions. For 69 of the 83 conditions tied to sleep duration, the lowest risk fell between six and eight hours a night. Meanwhile, people sleeping fewer than five hours faced a higher risk of 37 different conditions, the worst showing in the entire study. Chamomile, lemon balm, passionflower, and valerian root have long histories as evening teas. In fact, research suggests valerian and chamomile can improve sleep quality for some people. Pair a warm cup with magnesium-rich foods like pumpkin seeds, spinach, or wild-caught salmon at dinner. Together, these create a slower wind-down than scrolling ever will. Sardinian village may be a new longevity hotspot University of Illinois at Chicago, October 6 2026 (Medical Xpress) A terracotta-tiled village in the mountains of Sardinia may offer researchers a rare opportunity to uncover the secrets of exceptional longevity. A new study found that women in the village of Bolotana, on the Italian island of Sardinia, who reach age 70 are nearly four times as likely to reach age 100 as women in the United States. The findings suggest the community could represent a newly identified "blue zone," an area where people live unusually long lives. The study, published in the journal Frontiers in Aging, examined demographic records from the village of about 2,300 residents and found a favorable pattern of survival among older adults, particularly women. Researchers estimated that 13.8% of women in Bolotana who reach age 70 will live to 100, compared with approximately 3.5% of women in Italy and 3.6% of women in the United States. The traditional diet of the Sardinian longevity zone in the mountainous Ogliastra area is a largely plant-centered Mediterranean-pastoral diet rather than a strictly vegetarian diet. The diet centers heavily on locally grown vegetables, legumes, whole grains, potatoes, fruits when available, and olive oil. Beans and other pulses are regularly consumed. The mountain communities of the Blue Zone have a strong pastoral culture, and sheep's and goat's milk, cheese and other dairy foods are important sources of protein and fat. New study shows any healthy eating plan slows aging German Centre for Neurodegenerative Diseases & University of Bonn, October 5 2026 (Natural News) A German study of 7,500 adults found ten distinct healthy eating styles (e.g., Mediterranean, Nordic, DASH) all linked to slower biological aging, emphasizing that consistency in whole, nutrient-rich foods—not rigid adherence to a specific diet—is key to longevity. All ten diets share core elements like vegetables, fruits, whole grains, legumes and healthy fats (e.g., olive oil, omega-3s), which reduce inflammation and support cellular repair regardless of cultural or regional dietary labels. Even modest improvements (e.g., swapping fried foods for roasted vegetables) correlate with slower aging Diets rich in antioxidants (berries, leafy greens) and anti-inflammatory foods (fatty fish, herbs like ginger) counteract chronic inflammation—a major driver of aging and disease—while processed foods and industrial oils accelerate it. Diet works in tandem with sleep, physical activity and sunlight for optimal health, creating a "multi-pronged defense" against aging. The study emphasizes practical, adaptable habits over rigid rules for long-term well-being.
