Fasting for twenty-four hours is, according to various wellness and medical sources:
Dangerous. Difficult. Unsustainable. Medically inadvisable without supervision. Not recommended for most people. Potentially harmful to metabolism. A form of disordered eating in some framings.
Let's think about this for a moment.
The average human body stores approximately 2,000 calories as glycogen and somewhere between 80,000 and 150,000 calories as body fat.
That fat is not decorative. It is not a design flaw. It is not the consequence of a broken system.
It is a fuel reserve. It is the evolutionary solution to the entirely predictable problem of not always being able to find food. Your ancestors did not eat three meals a day at regular intervals with scheduled snacks. They ate when food was available and didn't when it wasn't, and the periods when it wasn't could extend for days.
Your body knows how to do this. It has the machinery. It has the fuel. It will, if you allow it, run perfectly competently on stored fat for periods measured in days to weeks without meaningful performance decline, let alone harm.
The idea that going from dinner to dinner tomorrow without eating is a medical event requiring supervision, in a body carrying 80,000 to 150,000 calories of stored energy specifically designed for exactly this purpose, is one of the stranger things the nutritional consensus has managed to produce.