You do have to be careful. It’s not a license to stuff your face all day long Calories in, calories out is kinda frowned on nowadays, but hard to argue that if you’re running a large calorie surplus - regardless of macros - you’re probably going to gain. Unless you’re a bottomless pit teenager…
The difference for me was…eating so much fat and ditching the carbs, I simply wasn’t hungry every 3 hrs. Compared to other diets where I just did calorie deficits, i always felt deprived, hungry, food on my mind all the time. Keto was much easier. I don’t feel like I’m not getting enough food. When I started fasting 18/6 I felt hungry around 10am (my normal eating times are noon to 6pm, fast the other 18 hrs). Still do. But I drink a cup of black coffee or a bottle of water & that “i’m hungry” feeling goes away and I’m fine until noon meal. Before, if i felt hungry & didn’t eat, I felt more & more hungry [hangry], weak, couldn’t get that hunger feeling off my mind. Now it just passes quickly & I’m fine.
For me trick was getting fat high enough & meals proper size that I wasn’t starving by next meal time or obsessing about getting a snack. Getting to truly wanting 2 meals a day, no snacks between, and feeling fine 95% of the time as far as not wanting food worked well. Dunno if i will ever progress to one meal a day. Not feeling it yet that’s for sure, but 18/6 is now pretty routine & I like it.
However, what I can’t do is OVEREAT my noon meal and then still feel satiated/not hungry around 6pm. Had to figure out how much enough was - what kept me feeling fine noon to 6pm. But if i went real heavy and had another 600 calories at lunch, I’d still be just as hungry & ready for dinner around 6. So you do have eat within reason