The diet style that I really want to look into first is the Zone. This is the meal plan prescribed by CrossFit and definitely is effective for losing weight. The Zone also does not strictly prohibit the consumption of any particular food. The two biggest components of the Zone are portion control and balance.
The Zone diet works off of a block system; each food is categorized in a particular macronutrient (carbohydrate, protein, fat) and assigned a serving size. Each serving size is one block. The blocks are designed to provide each meal and snack with a macronutrient break down of 40% carb, 30% protein, and 30% fat.