No they weren`t. Where humans originated, Africa, fruit trees produce year round.
All plants go through a cycle of growth and all plants aren't on the same growth cycle meaning some plant foods will be available at certain times. These plants were harvested wild, since they was no agriculture, and subject to competition by other species and enciornmental variables-meaning-acquisition and consumption would not have been on a consistent basis, and certainly not to the degree consumed presently.
Human beings weren`t "meant" to wear eyeglasses, take medication for any health problems, drive cars, fly planes, build cities, invent electricity-so I guess we don`t need those things either. 
In a way, that is true but also not true. Evolutionarily speaking, those who were not capable of hunting game or surviving illness would have died off. But, human beings have also evolved to be inventive and social creatures who adapt not only biologically but culturally and intellectual. We care for each others and find solutions to problems.
The differences being that the use of glasses, for example, aren't contrary to our biological programming. A better analogy would be the inhalation of carbon dioxide, which in small quantities won't harm you but in large amounts will be deadly. We have evolved to handle a particular threshold and anything above that threshold is lethal.
I have to admit I'm simply speculating. I enjoy the exchange of ideas and don't have a strong opinion.
