Here's the link:
http://www.bodyandsoul.com.au/health/health-advice/study-finds-fasting-for-3-days-can-reboot-your-immune-system/news-story/69ca1ada71555013cee36c3c2ed233e3
I read the same study a few years ago, so I immediately did it. I fasted for about 3.5 days. I can tell you that it did not cure my chronic HBV.
This could be probably easier for us who do not have good appetite anyway:-)
Beware of simple but deadly phenomenon of hypoglycemia while prolonged fasting. I've seen dangerous outcomes of it.
i just came across this interesting article related to fasting with hep b
http://www.hepb.org/blog/fasting-safe-people-living-hepatitis-b/
doesnt work on hbv at all and doesn t work on most chronic diseases.it only works to slow aging