This is (called 16-8, 16hr fast and 8hr eating window) is actually a recommended way to start IF. I've been on it for ~4 months and can second the effectiveness of weight loss.
About the calorie intake; a funny side effect is that I'm now naturally less hungry even during the 8hr window so the calorie intake has automatically reduced.
I was wondering why would that be and then learned about insulin resistance and things began to fall in place.
Now I'm doing 16-8 IF and close to zero added sugar diet (which is painfully difficult in Indian cuisine, more so during this festival season :-|).
If you imagine it to extremes, if you put all your food for the day on a plate and gave yourself 1 hour how much could you eat if you weren't trying to make yourself sick?
For most people of you only eat between noon-8pm, say (”18-6”) then you'll reduce your calorie intake naturally. Couple it with appropriate exercise and you'll lose weight (doesn't mean you'll be healthier necessarily though!).
BTW what does your IF plan look like? I'm thinking about between 4pm (needs a coffee around 2 or 3) and 8am but not sure if it actually is IF.