My Nails Are In Bad Shape, In That They Have

My nails are in bad shape, in that they have become paper thin. I'very never had strong nails, but they are terrible now. For the last 5 months I have been on a low carb, high protein, and taking Adipex. I have lost 40 lbs. I'very never eaten so healthy, Veggies & fruits, etc. I don'T get it.