Alimentos ultraprocessados favorecem envelhecimento biológico

Estudo com mais de 800 pessoas sugere que uma dieta ruim pode fazer com que as células envelheçam de forma mais rápida

Os alimentos industrializados são práticos, mas, segundo pesquisadores, favorecem o envelhecimento biológico se consumidos com frequência.

O estudo, que possibilitou medir um marcador do envelhecimento biológico (o comprimento de componentes genéticos chamados telômeros) em 886 espanhóis de mais de 55 anos, levando em conta o seu consumo diário de alimentos ultraprocessados, sugere que uma dieta ruim pode fazer com que as células envelheçam de forma mais rápida.

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Exercise improves memory, boosts blood flow to brain

 

Scientists have collected plenty of evidence linking exercise to brain health, with some research suggesting fitness may even improve memory. But what happens during exercise to trigger these benefits? New UT Southwestern research that mapped brain changes after one year of aerobic workouts has uncovered a potentially critical process: Exercise boosts blood flow into two key regions of the brain associated with memory. Notably, the study showed this blood flow can help even older people with memory issues improve cognition, a finding that scientists say could guide future Alzheimer’s disease research.

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People aged 95 and over show stronger brain connectivity

World-first research led by neuroimaging expert Dr. Jiyang Jiang at UNSW’s Centre for Healthy Brain Ageing (CHeBA) has found that those aged 95 and over demonstrated more activation between the left and ride side of their brain than their younger counterparts.

Given the prevalence of dementia increases with age, near-centenarians and centenarians without dementia are generally considered as models of successful aging and resistance against .

“We wanted to see if there was something particularly special about the ‘s functional connectivity of those aged 95 and older that helps them preserve brain function into the 11th decade of their life,” says Dr. Jiang.

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Scientists discover ‘why stress turns hair white’

Scientists say they may have discovered why stress makes hair turn white, and a potential way of stopping it happening without reaching for the dye.

In experiments on mice, stem cells that control skin and hair colour became damaged after intense stress.

In a chance finding, dark-furred mice turned completely white within weeks.

The US and Brazilian researchers said this avenue was worth exploring further to develop a drug that prevents hair colour loss from ageing.

Men and women can go grey any time from their mid-30s, with the timing of parental hair colour change giving most of the clues on when.

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Já ouviu aquela história de que cabelo branco muito cedo é por conta do estresse? Estudo publicado pela Harvard University revela uma ligação entre o sistema nervoso e as células-tronco que regeneram pigmentos nos folículos capilares. Leer Más


Hyper-Long Telomeres Give Non-Genetically Modified Mice Longer, Healthier Lives

Scientists at the Spanish National Cancer Research Centre (CNIO) generated the first mice that have super-long telomeres in every one of their body cells. Studies with the animals showed that in comparison with mice that have normal length telomeres, the hyper-long telomere animals lived on average nearly 13% longer, were leaner with less white fat tissue, and had better metabolic health. The researchers generated the mice from embryonic stem (ES) cells that carry the hyper-long telomeric repeats capping the ends of their chromosomes. The most relevant achievement for the scientists is that for the first time longevity was significantly increased without any genetic modification. “This finding supports the idea that, when it comes to determining longevity, genes are not the only thing to consider,” commented research lead Maria Blasco, PhD, head of the CNIO Telomeres and Telomerase Group. “There is a margin for extending life without altering the genes.”

Blasco and colleagues published their findings in Nature Communications, in a paper titled, “Mice with hyper-long telomeres show less metabolic aging and longer lifespans.”

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