Here is a quick rundown of a diet that will work. First, there is not a single diet that will keep the weight off once you first lose it unless you maintain a healthy eating style and exercise routine. You have to work to be healthy, it doesn't come in a pill or drink, it comes from eating healthy and exercising regularly.
The best and easiest diets to lose weight trim-fast are going to be the ones that encourage a person to eat fresh fruits, veggies, whole grains and a variety of healthy meats (fish, skinless chicken etc.). The meals should be well balanced and nutritional. You will also need to learn how to eat enough food to satisfy your hunger yet not eat too much to make you full.
Learning how to balance your foods is usually a trial and error type of thing. However, if you drink a glass of water before you eat you will feel full sooner than if you drink after you have finished the meal. Try trim fast pills to all fillers to your meals to help you achieve the satisfied feeling a little sooner. A great filler to have is whole wheat dinner roll. This has nutritional value with little calories.