I have lost about 18 lbs so far, doing 4 hours of gardening work 5 days a week. I think I have added a few pounds of muscle too, so its not just fat loss, I am changing my body composition. I initially lost 10 lbs right away and then gained it back and then lost 8 more lbs. I am down to 192 now from 208 when I got here in April.
Acoording to this website E:\See How Much weight can you lose Gardening.htm I am burning over 1600 calories a day. I am doing a lot of "hardscaping" i.e. building fences, stone work etc. in addition to some lighter stuff like planbting a weeding. I think carrying logs to the hugelculture bed has been the biggest physically demanding job.