I'm not a muslim, but I've done ramadan for my own edification and really it seems fine. Ramadan isn't prescribed for anyone who's on prescriptions or unhealthy. The worlds top soccer players fast and are still competitive. On top of that, a large part of the middle east was conquered while the soldiers were fasting.
The human body is quite capable of more than we give it.
I think society has gotten to a point that if we don't have 3 "well balanced meals" daily, drink a gallon of water a day, you're living unhealthy and bad.
But people don't realize that fasting is important to your body... We store fat to use during that time... That's the whole point of storing fat. Energy and that while you don't have it.
12 hours a day is absolute cake-walk for our bodies.
Yeah, fasting is great for letting our bodies recalibrate. 12 hours is nothing. It's parroted a lot but a large UK gentleman went an entire year on multivitamins, water, and a handful of other minerals to lose weight with no damage to his body. He was under doctor supervision so self-managed fasting is probably between 12 hours and 365 days.
The human body is quite capable of more than we give it.