By no means am I going into the science of this, but you don't need to understand everything to benefit from doing it.
Time Restricted Eating (TRE), or Time Restricted Feeding (TRF) - same thing - is probably the most basic thing we can do to promote better health, give our body's and digestive systems a break and, as a bonus, can also help with fat loss as it can often lead to a reduction in calories.
The premise is simple, set yourself an "eating window" each day and after the cut-off time (ideally at least 2-3 hours before bed), consume zero calories from either food or drink.
You may know it as Intermittent Fasting (IF) or 16/8 or multiple other names, but they're essentially all the same thing.
We didn't evolve to eat 3 meals a day, every day, forever. We evolved to eat when we could, then go for extended periods without food (by that I mean days, not a couple of hours between meals!).
I'd recommend looking up Dr Satchin Panda to learn more about this.