You reversed your on zero carb?
if not I'm just going on accredited published facts behind the Newcastle diet, if you have other credible studies for low carb, we've be delighted to read them, if you put up the links.
The original study for the Newcastle Diet only had a follow up 3 months after the end as far as I can find in the publications.
Prof Taylor mentions that 7 of the original 29 members had "normal" glucose levels after that time and had gained back 4 of the 14 kgs they had lost.
So for your 7 I'll point you at the success stories posts here and the testimonials at Dietdoctor and Intensive dietary management. As well as the members of the 2ketodudes facebook group (which I think numbers over 10,000)
The new follow up study of the calorie restrictive diet will not be published until 2018 so I guess we will have to wait and see what the results are. And see if they look at the metabolic rates of the participants then too.