[elmolino89]

I guess the subject in question was not put in a prison cell where 800 kcal was handled through a controlled opening?

The 130kg person burning just 800kcal/day is something highly suspicious. I am not sure if would be enough to lie in coma in a +30C room with a severe thyroid hormones deficiency to get to that level.

There are examples from hundreds of concentration/POW camps, periods of famine: if such extreme BMR lowering would be a thing, we would see it long time ago.