food for thought!!!!!!!!!!!

we have a subject in the last trimester of my MBA that deals with the ecology, science and environment. basically with the nature. its a nice course to have atleast its different than the usual ones. well that day an interesting issue was raised in the class. it was about what food one should eat?????? well our sir was of the opinion that we should always eat that food which is supported by the ecology of the area we are living in..... that means if i am living in jammu then i should eat only those things that can be grown in jammu......... not the things transported from outside where the environment can be different than of jammu......... how true or untrue it is????? when i heard this idea for the first time i was not only taken aback but found it absurd....... but to a cretain extent it is true.......... in the very early stages of evolution humans were dependent on those foods that could be grown in the area they were living in.......... but that time there was no tranport available and moreover there is no evidence that those poeple were more healthy than us............ i mean the environment we are living in has changed so much that many foods and plants has completely vanished from the face of the earth.......... we can nevertrace them back or know about them............ and in the course of time we also have found out many new things that are quite haelthy to eat right?????????? so how can we say that we will be well of by surviving only on local foods?????????? why i cannot take that logic is because there is no clear cut evidence to back this "assumption" up.......... so it is really difiicult for me to swallow it up..........
i was reading the book titled as "your food is your best medicine" written by Mr. Henry Beiler. he cures diseases by changing the foods that we eat........... in fact he is of the opinion that food is the root cause of every diseases............ and that is why it is very important to be cautious and selective with the food we eat........... but he never mentioned that foods out of the locality is taxing to our bodies........ so is it true that eating foods not supported by the ecology is bad for the health???????????? well i could not find any clear cut evidence.......... so cannot believe in it fully............