The "Effects on humans" section basically just talks about the normal ill-effects of being overweight. When it does cite actual scientific papers about calorie-reduced life-extension in humans it's papers like this: "Why dietary restriction substantially increases longevity in animal models but won't in humans."

That paper bears out the earlier point: there's a trade-off between fast reproduction and longevity. Humans have already traded off for that: we reproduce very slowly and live very long lives. Any life-extension effects of this in humans are likely to be noexistent or very small.

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