Yes Abs diet plans do work, provided you follow them strictly. If you feel you're heavily packed with regards to your weight, you should follow a good diet plan and bring down your weight considerably. Once that is accomplished you should stick to a healthy style of eating and a good one hour of physical work out. Overdoing anything is not good. You should follow one round of the diet plan and give it some time before you start again, meanwhile don't over eat when you're off the diet as it will not be fruitful at all. Maintaining the plan is the key factor to staying fit and healthy.