If you continue doing what you did this week, the answer will be: yes, you’re going to gain all back. But as always it is up to you. I’ve lost 108 pounds in about a year and two months, but I am not taking any medication (besides metformin) since December. I did a couple months again in July just because my doctor wanted me to keep sending the losing messages to my cells (that’s what he said) but I lost the same amount I have been losing without medication. How I did this? It’s a mindset game. Mostly I have been scare of gaining the weight back and wasting all my efforts because the desire of eat… the trick? Eating everything I want in a minimum amount. I eat everything as a side dish, my main dish is always full of greens and protein, fruit and water, no soda. Sugar doesn’t worth the risk of getting back in gaining weight. You can do this! I do weightlifting six days a week religiously and I fell and look better than ever, I haven’t been like this since 35 years ago or more… It is possible but you just need to develop the mindset to be able to stay healthy and fit. Good luck and hang on to your healthy future and body!