I want to lose weight.
I want to lose weight.
I'm thin.
I have to lose weight, so I'm on a diet.
I have to lose weight, so I'm on a diet.
I will have dietary restrictions and will exercise in order to lose weight.
You must stick to your diet.
I am hoping that I can succeed with my diet.
I have to lose weight by July.
I decided to go on a diet.
I've decided to go on a diet.
You should go on a diet.