To answer this question, I do not think it is possible to obtain this bf measure (accurately for one) in a healthy manner ... If this was possible, I imagine the person living in an ICU ... call me crazy.
Oh and the 'foods' that could help would be the IV in the persons arm ... I'm not being a smart @$$ either.
Its is possible yes. Anything is possible. But boy you will have to have some dedication. And when you get there? You won't be able to stay there very long.
I believe Flex Wheeler came in at 0% in the early years. There is a specific name for it but for the life of me can't remember.