Even though fat is calorie-dense, don't eliminate it. It adds flavor, and if fat intake goes too low, biochemical systems trigger intense pig-out cravings. Make yours mono and you may end up eating fewer calories. So put olive oil on your toast instead of butter or margarine. And, nutty as it seems, studies show that a handful of well-timed nuts so effectively satisfies the appetite that you're less likely to overeat later.
Endless sameness is one reason prepared liquid diets work well for many people.
Boring, but not unbalanced. And don't go below 1,000 calories a day. Don't lie about your calorie intake. Keep a food diary. Exercise is vital.