Did Angus Barbieri have a zero calorie fast? vs Optifast

Did Angus Barbieri's 382 day fast involve any calories?[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2495396/pdf/postmedj00315-0056.pdf](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2495396/pdf/postmedj00315-0056.pdf) For some reason the **"absolute fast"** in the following weight loss program [https://www.thepermanentejournal.org/issues/pdf-archives/132-obesity-problem-solution-or-both.html](https://www.thepermanentejournal.org/issues/pdf-archives/132-obesity-problem-solution-or-both.html) still involved 500 calories per day (using "Optifast 70" five times per day). The first link makes no mention of Angus having protein (which contains calories) while Optifast contains a lot of protein apparently for muscle wastage.

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No man if you read methods it says non caloric fluids only. Not sure where you’re seeing the protein drink. He would also go 37-48 days between shits lol so I highly doubt any actual calories were consumed (protein I believe will still trigger body to create some stool especially 5 drinks a day)

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i’m sure i read at some point in his fast he started consuming nutritional yeast to get all the essential amino acids, but apart from that i don’t think he consumed anything else with substantial calories.

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He lost 125 kg during the fast. Normal protein loss during a fast is about 60-70 grams/day, but is less in obese, amd slowly drops over time as the fast continues. If we estimate his protein loss at about 50 grams/day, he would have lost 19 kgs of protein, which is 15% of his total weight loss, and would seem quite reasonable.