Nutrition

my coworker is about to start the master cleanse once again, and despite my numerous warnings against it, he claims that he has read more books on nutrition than i have and therefore knows better than i do. i don’t know a whole lot about nutrition, but many of the statements he makes in defense of this cleanse don’t even pass the smell test. i was wondering if one of you who knows what you’re talking about could inform me on how to convince him that it’s completely idiotic, because he sure as hell won’t listen to anything i say.

for clarity: the only thing he’s consuming over this fast is a lemon juice based beverage with cayenne pepper and maple syrup.

-he knows that the weight loss is only temporary, but expects to keep it off by eating a diet of only raw fruits and vegetables once it’s done.

-he claims that the body creates all the protein it needs on its own, and one doesn’t even need to ingest protein in their diet.

-he claims that his body will absorb all the macronutrients that aren’t in the juice through burning fat

-he claims it will detox his body and help him feel better, i’ve heard that there is no such thing as detoxification through dieting, that only the liver can do that.