I fast for 24 hours (i.e. no food, only water and a couple cups of black coffee) twice a week. Contrary to popular belief this does not activate "starvation mode", it burns fat and keeps the weekly calorie intake low.
I'd also recommend the schedule that I use, which is to eat a normal dinner, and then skip the following breakfast and lunch, and then eat dinner at your usual time. You get 24 hours of no food, but it doesn't feel like a whole day. You also get a beneficial side effect: if you have no food intake in the morning, you don't get nearly as hungry later in the day. It's much harder to eat breakfast and then skip lunch and dinner than to eat dinner and skip the next two meals. Drinking a lot of water throughout the day will also help alleviate the "empty" feeling.
I'm not a doctor, this is not medical advice, consult your healthcare provider before undertaking any diet or exercise routine, blah blah.
If you want to try it, it might be better to ease into it, for example try having some fruit instead of no food at all.