Dr Attia is against fasting except in extreme circumstances(advanced diabetes, no regulation on food intake, etc). This is because of the partial breakdown of muscle for fuel that the body uses before switching to stored fats. He sees musculature (exercise to be more precise) as the single most contributing factor towards a longer healthspan. Dr Attia did use to observe fasting protocols (quarterly water only fasts) before but has since stopped the practice and recommendation.
TLDR : Avoid fasting due to resultant muscle loss.
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