Is nutrisystem a healthy diet to follow?

Nutrisystem is a breath of fresh air, since it's a diet plan not based on anything drastic, and doesn't have pills or the like. The main issue is its expense, so if you have money to spare, it might be a useful thing. See here for a non-biased review of Nutrisystem.

If you don't want the expense and are willing to invest the effort, then you could try the Dan Galilee diet instead, free of charge.