Well if we live long enough, many of the so-called tales about "gut instincts" may turn out to be scientifically valid, according to this report by Rob Stein on NPR, “Gut Bacteria Might Guide The Workings Of Our Minds.”
In 100 years, a court of law may take your fingerprints and then check the microbes in your gut to determine if your criminal actions had a biological explanation. (Just as clever criminals today try to mask their true fingerprints, murderers of the future will alter their gut bacteria levels to provide a convenient alibi for their wicked ways.)
What you eat may correlate with who you are and what you do.
So much for autonomy of the person!
I jest, but only in part: humans are just the evolutionary conglomerations of bacteria that learned to cooperate. If we come to understand more about the working of this generally symbiotic relationship, it is entirely possible that we can create environmental conditions that will reduced mental anxiety and lead to more pro-social behaviors.
If so, Mayor Bloomberg’s foray into mandating particular foods and portions will just be the tip of the iceberg (lettuce), so to speak. Paternalism will find a whole new framework of justification. The "individual mandate" of the future will be to eat the prescribed serving of quinoa, washed down with the requisite cup of cocunut water. Bacteria rule and human mind will be seen as deeply enmeshed in a power struggle for the right chemicals and hormones. It's a brave new world.