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Do you want to lose weight with this, or just stay fit? That makes a big difference. Running on an empty stomach isn't universally bad - lots of people do it regularly without issues - but whether it makes sense for you depends on how intensively you're training and how your body responds to it. With easy, short runs, nothing dramatic usually happens, but with longer or more intense sessions, you might lack energy and your body breaks down muscle instead of fat. If you feel weak or dizzy while running, that's a clear sign you should eat something beforehand - a banana or a handful of nuts is often enough.
It depends on how intense you run - at an easy pace on an empty stomach, most people don't have a problem with it, but during really hard workouts you can run out of energy faster or get stomach discomfort.
The most important thing to keep in mind: it makes a huge difference whether you're already well-trained in general or just starting out. Beginners can run into circulation problems more quickly if they start running on an empty stomach at higher intensity, because your body simply has fewer reserves. But if you've been running for a while already and feel good doing it, fasted running is totally fine - lots of people actually swear by it. The tricky part is just not overestimating yourself and thinking you can suddenly go all out when you haven't eaten anything.
it's better to have at least a banana or a coffee with sugar beforehand - you don't have to run completely on an empty stomach. honestly, the thing is that your body does burn fat at an easy pace, but if you notice you're getting dizzy or your legs aren't cooperating, then you don't have enough fuel in the tank. my trick: drink an espresso an hour before and have a small snack, then it goes way better than running completely empty.
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