While fueling after a workout is important, just because you go for a 30-minute run AND you do intermittent fasting, it doesn't mean you can eat whatever you want. How much you eat still matters. Depending on your weight and the pace of your run, that half-hour run only burned between 200 and 400 calories. So you can't go overboard and inhale 5,000 calories during your eating window and still expect to lose weight.
Langevin adds to utilise mindful eating. "Eat when you are truly hungry, and make sure to stop eating when you're full."