Most certainly! I'm not an expert of anything, I'm just putting what I know out there. If that 70 pound loss involves a high level of fat, then get ready for the fat to just melt off. I'm just going from 214 to down around 195 and that's what happened to me.
I started fluctuating between 215-220 before Paleo 4 years ago and planned to go to 195, I hadn't been below 200 since college 15 years ago. I'm currently at 185 and perfectly happy. I also fast once a week for 18-24 hours.