IF got popular without the "fine print." It's better for people who are already fit and need to tune up. It's not for people who have significant weight to lose. Lose the weight first.
I would read up on the leptin reset, and focus on that before doing the IF. If you have 50-60 lbs to work on that is going to be a hormone issue one way or the other. IF at this point may just make it worse, just like over training would.