Can you post more about your health and how your other labs look.
The Fibrosure is only one possible indicator of cirrhosis. There are biochemical markers such as platelets, INR and the like - that may or may not be apparent. That your doctor would like to leap into treatment without more data is unsettling. I know if I were treatment naive and I had the CC IL28B allele I would at least ask about Victrelis. Did your doctor explain that the CC genotype is associated with better rapid virological response (RVR) and SVR?
I realize you are wondering if what you ate and when had an impact on your FibrosSure result but I guess I am seeing the situation with a considerably different view. Your doctor (ideally) should have been able to explain this. Is there a particular reason why you have had no other type of assessment of your liver function other than the FibroSure?
You are right though - this brochure about the Fibrosure says you should fast for 8 hours. There are lots and lots of threads on here related to the disparity of the FibroScan (FibroSure) and compare/contrast to a biopsy
In the PDF it says:
Discordance between liver biopsy and FibroTest/ ActiTest results
were primarily due to sampling errors associated with small biopsies 15 mm indicating greater concordance when biopsy sampling errors were reduced.
In a recent publication by Poynard et al, discordance of two or more stages between FibroTest and liver biopsy (n=154 discordant samples) was caused by errors in sampling or interpretation of the liver biopsy associated with biopsy size and steatosis more than 60% of the time (97/154) and to errors in the biochemical test in less than 10% of cases (13/154). The reason for the discordance could not be determined in 44/154 samples
Here are a few threads:
Bali has lot of insight