why is it that even after trying so hard we still don't succeed in getting flat belly

Oh sorry you feel that way friend. I know how you feel, I too was at one time with the nice flat belly. Now it is not so. I have try everything to remedy it. Still no good. I know if I could have a treadmill it would work for it.

There are so many factors and different reasons why people try and cannot lose weight. Sometimes there is a medical reason, so maybe you should check with your doctor if you are really concerned. Different diseases can make it very difficult to almost impossible to lose weight. Also, there are some medications that will not allow you to lose weight, so a doctor could check and see whether or not those are factors for you.