The point is to annoy you. He’s hyper critical on diet as some foods are just genuinely detrimental to your health like flourine. I may understand cheating on your diet but you shouldn’t let him bother you.

I agree. when you go long amounts of time with out eating your body goes in to a ketogenic state where your metabolism slows down and your primary fuel source switches to fats instead of carbs. This is great for thyroid health and cardiovascular health, and I even believe hgh is released to but I could be wrong. But this only occurs typically 12 ish hours in to fasting so I supouse a short fast wouldnt replicate these results but you haven’t quite specified.