The British Medical Journal admits you can end diabetes with lifestyle alteration: http://www.ncl.ac.uk/press/news/2017/09/losingweightcanreversediabetes/
Another long-known biological fact gets a headline. Though this is a bit late, it's still poignant, because there are organizations and specialists in the field for whom this is news. Insulin sensitivity/resistance and glucose tolerance/intolerance are spectra. That is, you are not either/or with regards to glucose and insulin control. You are approaching one theoretical limit or the other. Thus, whichever direction you're headed can be reversed and changes from day to day based on many factors.
In my experience, some diabetes-diagnosed clients do a complete about-face in 3-10 days of nutritional changes.