Final answer:
The association between fast-food restaurants and child obesity levels is related to societal ills, the U.S. obesity epidemic, and the correlation between fast food availability and children's health.
Step-by-step explanation:
The association between fast-food restaurants and child obesity levels is related to several factors. Firstly, fast food chains are connected to numerous societal ills and are a contributing factor to the U.S. obesity epidemic.
Secondly, there is a correlation between fast food availability and the percentage of children rating "healthy" on school fitness tests. Lastly, physical activity and healthy eating are fundamental in preventing obesity.