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Try to avoid any fad diets, like 30-day programs or diets that prohibit eating whatsoever, i.e. liquid diets. While these types of programs might produce short-term results, they do absolutely nothing to get at the root causes of why people gain weight in the first place. In other words, they're worthless.
Cut down on the number of calories you consume for each meal by filling your plate with vegetables. Most vegetables are nutritious, filling and very low in calories. Some vegetables, such as celery, actually have negative calories. Loading up on vegetables will let you have a big meal without breaking your diet.