People still have to eat staple food. You can eat seven points full, control your food intake, or eat more meals.
Maybe diet replacement can get some effect, but it is often a temporary solution rather than a permanent cure, and it is easy to rebound. Don't listen to others. It's usually a lie.
I suggest you take regular exercise. Whether running or dancing in square dance, if you can persist for three months, you will definitely see the ideal effect.