The Science of Fasting
Energy balance (calories in, calories out) still matters relative to fat loss. Your alternate day fasting is just changing how you reduce your calories. If you overeat fat, as promoted by Fung and others with the therapeutic keto diet, you'll eventually stall out.
I hate when people tie it all up so simply to CICO. MAYBE at the base Kcal level it is true; but in the psychology of what drives people to eat beyond just "eating to live", it's not helpful. For one thing, counting calories -- along with accounting for calories burned due to exercise -- is soul killing (and you can't out-exercise a bad diet), so I find that useless to know.
I needed something that was going to teach me about MY eating habits and, more importantly, get beyond my inability to control my eating by willpower. I don't have an eating disorder; but when I fast, I realize how much of eating is boredom or distraction or just the "action" of eating. That was quite a revelation to me as I did not consider myself an emotional eater. I still don't "eat my feelings" but I didn't think I was engaging in a "habit" of eating, if that makes sense.
I am not fasting right now per se (more like OMAD); but because I'm focusing on being more mindful about using willpower to curb my sweets habit, I have lost 6 pounds in 2 weeks. I've also learned to add ACV to my daily water consumption and have made it a habit and I'm so proud of myself!
Fasting isn't for everyone, I'm sure. But for me, it's been a beneficial tool that, because I had never fasted before, gave me a lot of insight to my own psychology of eating and further cemented my mantra of "hunger is not an emergency".