to whom it may concern,
human beings are very close to the primates and their pre- historic food was fruits but due to the changes in the economic condition they were forced to change their feeding habits.
just an example, when a male prehistoric homonoid successfully thrashed his female opponent the it was his duty to provide food for her and to protect her as well, thus the burden increases (there can be hundreds of unknown reasons too!), and thus gathering food forcibly occured.
thus the future consequence was the change in the feeding habits in those pre historic times. and in this modern times too! when we look upon the individual food histories we find that the changes in economic condition was liable for the changes in our feeding habits. What our grandfathers ate in their times are rarely eaten by us.
interested ones reply with pros and cons
and perfect reasonings.