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The key to deeper sleep might be a high-protein diet

Flies and mice fed a high-protein diet were less likely to be awoken by movement during sleep than animals on a regular diet

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Caffeine linked to lower BMI and reduced risk of type 2 diabetes

Environment

Students ate less meat for three years after a talk on climate impact

2A6JA2X Top view at Mediterranean diet dish greek salad on slate tray

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Mediterranean diet may prevent cognitive issues for people with MS

Multicolored ice cream - one sweetener added to some ice creams may raise the risk of heart attacks

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Artificial sweetener erythritol linked to heart attacks and strokes

In a trial, some participants were asked to reduce their calorie intake by 25 per cent every day. After two years, they showed signs of slowed biological ageing in one test, but not in others

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Does restricting calories slow down ageing? We simply don’t know

Puppy eating from a bowl

Life

Dogs that eat raw food rather than kibble have better gut health

fresh artichokes at farmers market ; Shutterstock ID 1472137547; purchase_order: -; job: -; client: -; other: -

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The food and drink that really can boost your immune system

Countries such as the UK, Mexico and South Africa have a tax on sugary drinks

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Taxing sugary drinks may not cut obesity as much as headlines claim

Person milking a cow

Humans

Milk may have fuelled a growth spurt in ancient Europeans

An analysis of ancient human skeletons finds that an increase in size and weight in some regions coincided with the rise of lactose tolerance

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A Silent Fire review: What you need to know about inflammation

Chemistry

Chocolate with a low-fat centre could still feel luxurious to eat

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Read New Scientist鈥檚 5 best long reads of 2022 for free

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Shortage of pollinators could be killing 427,000 people a year