For me it was intermittent fasting. 16 hours a day, it took a few weeks to get to 16. Only water until then. 7 pm to 11 am no food. I did no other modifications to my diet.

I lost 60 pounds easily. There were natural resistants points that would move again after a 1 to 3 month period.

Exercise is important also. You loose weight by breathing out water. Fat is just carbon and water. Pee it out or breath it out.

You can try other diets. Fold them in after some time fasting. Fasting gave me satiation back. I would eat and finally feel full and could go 4 hours or more before more food.