What is the best way to lose belly fat for 50 year old? i exercise 3 or 4 times a week and am active in my job. i tried atkins but not much luck.

Lots of reasons: Increased belly fat can be present for many reasons. The root cause of your belly fat would dictate the secret of getting the weight off. I would recommend you get in for a complete evaluation to investigate the root cause. You need an evaluation of your hormones, insulin, body type, body composition, and compete physical. In the meantime, increase vegetable intake, and exercise intensity.