In my opinion the most effective diet for fat loss would be a cyclic ketogenic diet in which you cycle macronutrient ratios every 3-4 days. i.e low carb, moderate fat, high protein for 3-4 days, then one carb meal of 100-200gms last meal of the day; then resume low carb, moderate fat, high (consistant) protein for 3-4 days, then carb load last meal of the day - repeat cycle. The carb load meal should be based around complex carbs, while protein and fat should be kept to a minimum during the carb load meal.
Note: Its more important to have a consistant supply of protein throughout the day than a high amount of protein. i.e 20gms protein, 6 times a day is better than 50 gms protein 3 times a day.
Take in plenty of EFA's, and drink water until you're eyes are floating in their sockets. Supplement with a multivitamin, extra Vitamin C, Potassium and B Complex.