If your new regime still involves alcohol then this could be a factor.
If I drink during a weekend then I can undo any weight loss that week, however no alcohol means a good weight loss that week. Shame I like alcohol

__________________
Start weight: 18 st 4. Current weight: 16 st 13. - Broke the 17 barrier
Fastest run speed: 6.2 mph. Longest run: 3.1 miles
Current goal: to complete the above and talk at the same time.