I assume this calorific intake is just when you are in diet mode? Serious question - I was a fat kid and I've been struggling with my weight all my life (I'm a pensioner now - still struggling!). I do find that drinking beer destroys any possibility of losing weight. Maybe the diff is your exercising.
I too have been doing some intermittent fasting recently, and then just generally keeping an eye on my eating otherwise. My general routine is something like this:
Monday - Fast
Tuesday - Healthy eating, go for a run
Wednesday - Fast
Thursday - Healthy eating, go for a run
Friday - Healthy eating in the day. Go easy in the evening but have a few drinks
Saturday / Sunday - No rules. No guilt.
On all the weekdays, I try to keep within a slight calorie deficit, around 250 calories under, but invariably I'll be a little under that too. On Fridays, I try to make sure I've balanced the calorie intake with the amount I have burnt. I use an app on my phone to track things. In the 5-6 weeks I've been doing this, I've lost about 4kg / 9lb which has come off my slightly podgy gut (I'm not fat but carry just a little too much around the middle).
But there are two things in play here - the fasting and the calorie deficit. You don't have to do the calorie deficit part so don't need to do the exercise, and should still lose some weight.
I've linked the video that started it all off for me that explains a bit more (I neither look like that bloke, nor would I want to). The point to note is that it allegedly burns fat without burning muscle (I wouldn't know about the muscle part as I don't have any!!) and you can eat a normal diet in the time that you're not fasting, i.e. you just eat a day's worth of food in the 8 hours after you have finished fasting. Alcohol is not banned but there's a little rule about not drinking on an empty stomach and just allowing your food to digest a bit before drinking - again, not tricky. You can also do some smarter things around avoiding consuming carbs and fats at the same time but I've found that's a little harder in practice and interferes with my life too much, so I don't bother.
The fasting thing isn't actually that difficult to achieve. You just go 16 hours without eating - sounds like a long time but you'll be asleep for half of that. In practice, you have your dinner and then stop eating until lunch the next day - no calories allowed in during that time, so only black coffee, black tea (no milk, no sugar) and water. The first few times you do it, you feel a little hungry and can feel a bit light-headed by lunchtime but it soon passes. It's amazing how much the water can sustain you through the day.