I was on a very strict diet (Medifast) for 3 months, lost 30 pounds. I gradually transitioned off of that to counting calories, low carb, high protein, etc. During the transition period (the last 5 weeks) I started walking/jogging 5 or 6 days a week. Every other day I take it easy and fast walk while doing C25K. I haven't lost any weight during this time. I am eating between 1200 and 1400 calories. I still have 39 pounds to lose. Am I doing something wrong? I feel like I am giving it my all and nothing is happening.