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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 ha...

Work week, and still stormy skies across the central u.s. back to you guys. >> we'll get ready for t karen, thank you very much. we will see you back here at the top of the hour, 8:00 eastern, for more "new day sunday." >> "sanjay gupta m.d. starts for you now. hey there, something surprising to start with, you're going so see how easily you can buy steroids and other medicines, sometimes with dangerous side effects with the click of a mouse. also we tell to you read food labels all the time butted those mysterious ingredients sometimes look like code words. or a foreign language. first ...

The foot if you replace it the way we did? we have a big sugary soda here, cheeseburger over here. which of these is worse for your heart? >> i think the evidence really shows that the sugar is much more problematic in terms of your risk factors for heart disease and diabetes and obesity. >> you ask a kid about this which of these is worse for your heart. >> it's the bun, the cash carbohydra carbohydrates. >> you've written a book, a vo provaccive book and a lot of people will say we understand she took issue with some of the study, but there's a lot of evidence to show vegetarians have a lowe...

Surpris surprise. lot of people are going to be talking about, dean ornish thinks the book is dangerous. i want to be clear on something. are we saying, are you saying in the book that meat doesn't increase bad cholesterol or the bad cholesterol wasn't as bad as reported. >> the reason that meat, cheese and dairy were condemned is because they contain sat raided fats. the idea was they cause your cholesterol to go up and that that would clog your arteries and lead to a heart attack. it turns out the whole chain of events is not what we understood it to be true. the trials are rean nazized sinc...

>> there's no evidence to show vegetarians live long per. >> just about heart disease though. >> one of the things that confounds those studies that complicates them is vegetarians are people who care about their health. they don't smoke, they exercise, they go to the doctor, they do a lot of things that make them healthier people. they adhere to medical advice. the people who eat meat are the non-adherers, the people doing everything wrong because they're going against dietary recommendations so those complicating factors make the studies very hard to interpret with any reliability. >> is thi...