A Taste for Health

Had an idea for a story recently for if society found a way to make someone naturally like the taste of healthy foods (like vegetables, etc) - imagine if what you liked and craved lined up with what was good for you.  It sounds and all seems well, everyone eating better diets and enjoying better lifestyles.  Then imagine one day unexplained animal attacks start leaving people dead and torn up, seemingly at random and in generally urban settings with no dangerous wild predators.  As the story goes on, footage and evidence start to reveal the attacks seem to come from not any animal but a human.  The authorities track down and arrest one suspect, but the killings continue, seemingly at random and with no motive.  It turns out not to be any one person but people at random who suddenly go mad for human meat.  The commonality is they've all been genetically modified to like the taste of whatever is good for them, and it worked too well.  Because the healthiest food you can eat is human meat.