Heya, my advice is to be patient and encouraging with him. Ask him what he ate during these few days he was off meat, its possible that he just ate what he normally ate except without the meat, and didn't get any good plant protein. I'm not sure about detox, as I didn't experience it personally, but encourage him to give it another go and give him some advice on eating a good balanced diet. Also if he said he felt better after he slept it was possible that he was just tired!
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