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I agree with what a lot of people have been saying, that it definitely depends on what he means by "human nature". In some cases, there are many habits which are so deeply ingrained that it would be too hard to reverse them. There is too large a population with all different opinions and agendas that I find it hard to believe it would be easily possible to change the "human nature" related to foods as a whole. For example, I do not believe that the whole world could go vegetarian in order to save animals, energy, or whatever. I also do not forsee the food industry as it is today changing for the better (to be healthier, more energy-efficient, etc.) as a whole. To change this, everyone in the world would have to be on the same page about everything which, as human nature wills it, is impossible. However, I believe smaller communities have a better chance to undergo change. It is easier in smaller numbers to group together and make the difference one wants to see. So, if there were several "small communities" that were large enough to voice an opinion and take action together, I believe change in any sort of thing could be seen. So while I believe people do have the opportunity to make changes and choose for his or her self certain things, I do not believe that human nature specifically can be changed at this point. This is because the human race has sort of overcome "survival of the fittest". That is the way which the nature of a species can change: slowly over time with the qualities of a species which is able to survive being passed down and that species getting stronger as a whole because of this. I believe that the technological advances in the world today prevent the "weak" from dying out and the preferable genes being passed on. For example, everyone has a chance to survive from many illnesses and diseases because of medicine. There is no way for humans to change human nature. Humans can only make choices for themselves. Nature is what controls human nature.