I'm confused. Why do you desperate to lose weight ? Are you trying to add muscle definition ? Are you overweight ?

As kiwi said, starving too much is counter to both brain and body health.

Cutting back 500 to 1000 calories a day while maintaining healthy nutrition should provide weight loss without jeopardizing your health. Avoiding artificial sweeteners should be a priority as they are not good for brain health.

Developing a complete process for losing weight while maintaining your health should be your objective.