There are many different diets and many different ways to lose weight. While it has been correctly stated here that you have to consume less calories than you burn, it is also true that you need both information and willpower.
First, check with your doctor. What is your ideal weight? What is your acceptable weight? What is your BMI (Body Mass Index)?
Baruch Hashem, b’li ayin harah, my BMI this morning was 23.1. This has been a five year journey for me and I will be happy when it drops below 23. (Actually hit 23.0 last week.)
Someone came over to me in shul one Shabbos a few months ago and asked, “How come you’re not eating anything; it’s your kiddush?”
“No,” I replied with a smile, “it’s your kiddush. It’s just my yahrzeit.”
Hatzlacha to everyone!