Scientists are testing a keto cocktail for longevity and vigor - without the high-fat diet
Briefly

Scientists are exploring whether ketone ester drinks can enhance human longevity by providing an alternative energy source for aging populations, shifting from sugar to ketones.
"Whenever there are ketones in the blood, the body will use that as energy in preference to sugar... This could benefit older individuals who become less efficient at using glucose for fuel."
Read at Business Insider
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