vegetables, yell red and green. bok choi, mustard beans, san leandro to re, parsley, spinach, arugula and aspar gas and i m out of breath. reporter: there has been a push for four decades to get americans to eat less but a new book by nina taisholz challenges the science behind the idea red meat is bad. it s a dangerus book, telling people what they want to hear, not what s true. reporter: dr. dean ortnish helped president clinton recover from a heart disease. the healthiest way to eat is the degree to move towards a whole foods plant-based diet. we know that bus even people who have serious chronic diseases begin to reverse them to the degree that they make these changes. joining me to talk about this is the author of the big fat