Is it good idea to go on a diet to lose weight?

Yes, diets do work, and whoever says it does not is not pointing you to the right direction. Even doctors advice obese patients to go on a diet. But not just any diet, you have to carefully consider what you eat. Try to avoid fatty and processed foods as much as you can. Eat your veggies, and fruits. Try to cook your own food rather than buying microwavable meals. Do not forget to exercise to complement the diet.