Caloric surplus generally. Work in an occaisional alternate day fast, then a twomad refeed keep body guessing.
Other reasons could be hormonal over intake of estrogen, too much protein for body size can also cause some weight gain.
Best of luck.
The first thing I’d suggest is to not worry about snags along the way – they aren’t a sign of doom, more like a delay of a few days from your goal, at most.
When you go on a diet you drop a lot of water weight, and your body can easily soak that back up, but it isn’t fat. Sodium helps\makes you retain water.
IF is a great tool to help diets feel less stressful, more than a tool to make losing weight inevitable.
Don’t mistake the fasting ratio (19:5 or 23:1) as the degree to which you lose weight. It’s not like you could eat 3,000 calories if it was within 5 minutes and your ratio was 23.9 : 0.1.
You still need to count calories.
Of course, things like building muscle can affect it as well. Your weight is just a singular measurement of your overall health, if your clothes are still fitting larger than before it’s still a sign you’re not gaining fat, as muscle takes up like, half the space pound for pound.
Keep at it and just make small adjustments to your diet. 200 less calories, out of a diet of 1,500, for example.
Do you track your steps, by chance? Sometimes if I fast too long, I have less energy and my just normal day to day movement decreases. It doesn’t seem like a huge change, but looking at my daily steps, I see that trend. If you notice you are getting far fewer steps, may need to try a different fasting schedule that doesn’t let your energy drop as much. Every body is different and is going to respond to fasting schedules a different way. If you were losing more steadily on your old schedule, switch back. Good luck.
I’ve heard that most fasting studies were done on men and post-menopausal women. You could be experiencing some weight gain unrelated to diet if you have a menstrual cycle (usually the week before your period).