Most people are not near these places or it is expensive and they make not use of it. Also since there are many different flushes I would think most people skip that part.
As far as food I am like you and I am on low carbs. The only day I did not have fat was on flush day.
Just go ahead the Epsom Salts
(=magnesium sulfate) will
clean you out.
Make sure that you drink water between the concoctions about half an hour away since the ES is dehydrating.