We've known for decades that calorie restriction prolongs the life of lab rodents. There's also correlation between a low-calorie (but nutritious) diet and longer life in some human populations, Okinawans being the most frequently mentioned example. This recent summary of NIH-sponsored work starts to hint at what the mechanism might be:
https://directorsblog.nih.gov/2022/03/08/biology-of-aging-study-shows-why-curbing-calories-counts/
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