I do a slightly different form of intermittent fasting where everyday I only have Bulletproof coffee (just fats) from 10 PM to 4:00 PM. You write " I am still able to do moderately strenuous physical activity on fasting days " While I'm not an expert, ideally you should not be weaker while fasting because your body is gaining energy from ketosis.
Why would he be in ketosis? If he isn't eating low carb on his non-fasting days he should have an ample supply of glycogen, right?
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