I'm no professional, but that seems like a lot to lose in a short time. However, I have been drinking a apple cider vinegar cocktail before ever meal and it seems to help with appetite suppression and also gives me loads of energy. I find it much easier to get more active. Here's the recipe if you are interested...
2-3 teaspoon of Braggs organic apple cider vinegar with "the mother"
12 oz of water. (I use spring water)
Mix them together and drink before ever meal. The main 3.
Good luck with your journey✌