Atkins vs nutrisystem vs weight watchers. i'm 21 5^2 &aweigh about 200 .. what's the best way to lose 50-80 pounds within 2-4 months?

Atkins + Fiber: Atkins (0 carbs) is the way to go--but it's a tough diet to follow. It's virtually fiber-free, and can cause constipation. I recommend adding several tablespoons of psyllium husks every day (Konsyl, from the grocery store), plus lots of water, to keep you regular. Also, perhaps 500-1,000 mg of magnesium. Metformin 500 mg 3 times daily will also help with wt loss. Walk at least 15 minutes/day.

One that suits you: The one you can stick to the best and longest. Also, you can lose weight without spending money, which may be a consideration. Be your own task master! There are free apps on smartphones to help yourself remain accountable. Build in a cheat day as rewards. Also, your weight loss goals are excellent, but you will most likely need much more time to achieve them, and to keep from being disapoint