Anyone can lose 30 lbs in 1 month by fasting. Eat one meal every 3 days and the fat will melt right off. On the day you eat you don't even need to watch what you eat or how much (as long as its in a 2 hour window). Fukk you don't even need to go to the gym to lose those 30 lbs (though it does help).
Fasting gives you the benefit of ketosis without depleting your testosterone. Something the keto diet can't do.
Have you ever done this yourself or are you wildly suggesting people eat once every three days and and possibly exercise for no real good reason?