No it doe not. You have to watch what you eat. No, but it will work out those ab muscles. However, those nice abs are covered by a layer of fat and that is what you're trying to get rid of. Changing...
Apples help me shed pounds. They seem to really get my metabolism moving and they make you regular (poop) , too. There might be some truth in "An apple a day keeps the doctor away".
If you are most concerned with the size of your stomach I can tell you from experience that doing more sit ups is not going to solve your problems. I found the most success with dietary adjustments...
You should first control what you eat eg. Make sure you keep a healthy balanced diet: this means no fast foods or sweets. Then you exercise one to two hours a day depending on how much fat you wish...
There is no food or exercise that specifically makes fat disappear from your stomach. You body has specific order, and where ever you gained weight first, you will lose the weight from that area...