question about metabolism and weight loss shakes

wendyleach

So I have hit a plateu. I havent lost any weight in 3 months and i even left site for a few weeks because i felt discouraged. I try to keep calories below 1600 daily and do 1.5 to 3 hours at gym 4 days a week ( spin cardio abs trx a good mix).

Have considered doing diet shakes? BUt how does doing diet shakes affect your metabolism long term?
think i damaged my metabloism doing diet pillds years ago before kids now im just sooo frustrated but dont want to do more damage?

Any suggestions comment?