自从人类开始围坐在一起共同进餐，饮食之道就与文化而不仅仅是生理需求，结下了不解之缘，人类透过饮食，将自然转化为文化。数百万年来，人类已经整合汇编了明智的饮食之道，包括饮食的禁忌、仪式和烹调方式。让我们避开有害的食物，摄取有益的食物，身为杂食者的人类便无须餐餐面对吃与不吃的两难。
然而，20世纪后半期，在工业化食品和不成熟营养学的推波助澜下，人类创造了新的食物链。餐桌上的食物与它的源头越来越远，而人类则萎缩在工业化食物链的末端，丧失了与自然之间的原始记忆，更无从判断哪些食物该吃，哪些不该吃。于是我们发现自己在的卖场与餐桌前面临杂食者的两难：要吃有机苹果还是普通苹果？如果要吃有机苹果，那要吃本地的还是进口的？要吃野生鱼还是养殖鱼？应该吃肉还是吃素？
如果吃素，要吃纯素还是乳素食？
作为美国饮食界的引领者，迈克尔·波伦长期关注饮食议题，企图在工业社会与田园自然中寻求调和。在本书中，他以田园调查的方式走访农场、研发室、牧场、食品加工厂和超市，从产地一路追踪到餐桌，如侦探般地揭开现代食品的面貌，追寻现代饮食如何成为人类疾病的来源，给出了杂食者“到底要吃什么”的答案。

What has happened to us? Despite the most advanced medical technology in the world, we are sicker than ever by nearly every measure. Two out of every three of us are overweight. Cases of diabetes are exploding, especially amongst our younger population. About half of us are taking at least one prescription drug. Major medical operations have become routine, helping to drive health care costs to astronomical levels. Heart disease, cancer and stroke are the country’s three leading causes of dea... more What has happened to us? Despite the most advanced medical technology in the world, we are sicker than ever by nearly every measure. Two out of every three of us are overweight. Cases of diabetes are exploding, especially amongst our younger population. About half of us are taking at least one prescription drug. Major medical operations have become routine, helping to drive health care costs to astronomical levels. Heart disease, cancer and stroke are the country’s three leading causes of death, even though billions are spent each year to “battle” these very conditions. Millions suffer from a host of other degenerative diseases. Could it be there’s a single solution to all of these problems? A solution so comprehensive yet so straightforward, that it’s mind-boggling that more of us haven’t taken it seriously? FORKS OVER KNIVES examines the profound claim that most, if not all, of the so-called “diseases of affluence” that afflict us can be controlled, or even reversed, by rejecting our present menu of animal-based and processed foods. The major storyline in the film traces the personal journeys of a pair of pioneering yet under-appreciated researchers, Dr. T. Colin Campbell and Dr. Caldwell Esselstyn.