Question

How many states have adopted the FDA Food Code as a guideline for their own regulations?

Answer 1

All of them do, it's a federal organization 

Answer 2

49 states plus the District of Columbia

Step-by-step explanation:

According to the "Adoption of the FDA Food Code by State and Territorial Agencies Responsible for the Oversight of Restaurants and Retail Food Stores" report, as of 2018, 49 states plus the District of Columbia have at least one state agency that has adopted some version of the FDA Food Code. California is the only exception, and not all states have adopted the latest version of the Food Code, which is updated every 4 years.