It will be weight loss, you will also lose lots of excess water in the first week. I lost 10lbs in my first week, it's so encouraging when you get weighed at the end of your first week and it spurs you on. All my work clothes are hanging off me now but I won't buy anymore until I've reached my goal, hopefully,in another 3-4 weeks. Good luck with your weigh in- let me know how you get on x