I'm no expert on this, but I also read about this as I also tried calorie restriction.

You still have to keep your macros (and micros) in balance while on calorie deficit, which is even harder. Your body needs various things, you just need to optimize your food. Also, I think the main contributor for OPs issues was the fat deficit, which is very easy to fall into while you think you eat healthy a lean food. Fat is important for your hormone production.

https://pubmed.ncbi.nlm.nih.gov/26843151/

https://shilpidietclinic.com/low-fat-diet-and-hormonal-imbal...

In my experience(currently about 15kg into a 40kg weight-loss program), eating enough fat can also be very helpful for losing weight. It seems counter-intuitive, but it works for me. Fat contributes a great deal to satiety. My diet setup has been to have breakfast and dinner only, no lunch on most days. This way I can make both meals quite calorific, filling and plenty tasty. Crucial for maintaining adherence to the setup, which is by far the hardest part of weight loss.

When you have to go 7 to 8 hours without eating before dinner you want plenty of slow-burning calories. Long chain fats, protein, slow carbs, with plenty of fiber.

My typical breakfast ends up being one slice of bread with liver pate and cheese, another with peanut butter and either nutella(if I'm doing morning cardio or some other exercise mid-day. Lots of sugar in nutella, which gets used up immediately by the exercise anyway) or various kinds of jam with no added sugar(usually pear and apple, since they're not so tart and are pretty sweet without added sugar), and a protein pudding cup(20g protein). The bread needs to be whole-grain, of course. Ideally 100% whole grain.

This ends up being about 700 calories, which is a pretty substantial breakfast. And most importantly, it includes a lot of protein(from liver, peanut butter, cheese, the bread and the pudding), a good mix of saturated fats with plenty of SCFA and MCT from the cheese and liver, mono- and polyunsaturated fat from the peanut butter, and tons of soluble and insoluble fiber from the bread and peanut butter.

This tends to keep me full until dinner time, at which point I can typically eat up to 1300 kcal depending on how active I've been.

On extremely active days, I might either add another slice of bread to breakfast, or have a protein snack and some fruit after exercise, as well as electrolyte drink with sugar in it during(important both for energy and fluid uptake).

Anyway, I'm rarely hungry except for just before eating, which is the idea. I think this would be much harder on a low-fat diet.