Dr. Alexis Carrol, two-time Nobel Prize winner:

The staple foods may not contain the same nutritive substances as in former times....Hens have been compelled, by artificial diet and mode of living, to enter the ranks of mass producers. Has not the quality of their eggs been modified? The same question may be asked about milk, because cows are now confined to the stable all the year round, and are fed on manufactured provender. Hygienists have not paid sufficient attention to the genesis of diseases. Their studies of conditions of life and diet, and of their effects on the physiological and mental state of modern man, are superficial, incomplete, and of too short duration. They have, thus, contributed to the weakening of our bodies and our souls. And they leave us without protection against the degenerative diseases, the diseases resulting from civilization.

Alexis Carrel, Man Unknown (New York: Harper & Brothers, Halcyon House, 1938), .p. 116

Notice the date!!! How much worse is it now?

George Albert Smith on Pork:

There is another subject under consideration, which weighs very heavily upon the minds of the Saints. The Word of Wisdom recommends us to use the flesh of animals sparingly. The law of Moses prohibited Israel the use of swine's flesh; but in the Gentile world at the present day it is considered superior, as food, to almost every other kind of flesh. And even among us, with the education and training that we have received, there is a great deal of it used. . . . For some reason God, by special law, prohibited its use to the children of Israel; and it certainly seems desirable that we should also discontinue its use, as within the past few years in some countries where a great amount of pork has been consumed the people have been afflicted with a kind of pestilence - a disease which is considered incurable. It is therefore wise and prudent for us to adopt plans to procure supplies from other sources.

Journal of Discourses12:198-199

Remember what I've been saying about grass fed beef?

The beef fed upon our mountain grasses is as healthy food as we need at present. Beef, so fattened, is as good as wild meat, and is quite different in its nature from stall-fed meat. But we can eat fish; and I ask the people of this community, Who hinders you from raising fowls for their eggs? ...Fish is as healthy a food as we can eat, if we except vegetables and fruit, and with them will become a very wholesome diet.

Journal of Discourses 12:54-55

Interesting quote from Brigham Young on pork:

A thorough reformation is needed in regard to our eating and drinking, and on this point I will freely express myself, and shall be glad if the people will hear, believe and obey. If the people were willing to receive the true knowledge from heaven in regard to their diet they would cease eating swine's flesh. I know this as well as Moses knew it, and without putting it in a code of commandments. When I tell you that it is the will of the Lord to cease eating swine's flesh, very likely one will tell you that it is the will of the Lord to stop eating beef and mutton, and another that it is the will of the Lord to stop eating fowl and fish until the minds of the people become bewildered, so that they know not how to decide between right and wrong, truth and error.

Journal of Discourses 12:54-55