'The Big Fat Surprise' Rocks the Health Food World

A controversial new book says that a high-fat diet can be good for you.
3:34 | 05/12/14

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Transcript for 'The Big Fat Surprise' Rocks the Health Food World
The new book that claims a high-fat diet can actually be good for you. "The big fat surprise" is shaking up everything you've been told about eating healthy. Bianna golodryga has the story. Reporter: Bacon, burgers, butter, delicious but unhealthy, right? Not so fast. Reporter Nina teicholz, author of "The big fat surprise" says the way we think about it is wrong. Saturated father the is not bad for health. It doesn't cause obesity, diabetes and heart disease. Reporter: A pretty radical statement. The current usda guideline show a recommended daily food budget split between grain, fruits, vegetables and proteins with limited dairy consumption and allowances for so-called healthy unsaturated fat but saturated fat the you're saying the kind of fat this has is better are to you. Saturated fat is a solid fat you can see. It's not an oil. Reporter: Not all nutritionists are convinced. I think having too much could potentially raise new risk factors. Reporter: But Nina says the real culprit to weight gain is America's sugar and carb addiction. So in a typical day what do you eat? I start with bacon. For lunch I usually snack on nuts, cheese, salami. I tried so hard when I was a vegetarian and used to obsess about food but now I just don't and I barely exercise. And I found that I lost ten pounds and my cholesterol was fine. I could get used to it. Reporter: For "Good morning America," bianna golodryga, ABC news, New York. Joining us chief health and medical editor Dr. Richard Besser. You're going to -- no pun intended -- weigh in. What do you think? It's a really well-written book. This debate has been going on for decades. Those who say no fat, no carbs. The dean ornish group that bill Clinton was on, low fat and Atkins crowd who are saying it's all about getting rid of the carbs and this isn't going to solve that. It's so hard to study diets. We have a little illustration. Eggs and bacon on one side. Low fat gras knoll that, berries and yogurt on the other. Fat is going to leave you feeling fuller. Those calories will hold you longer so you may eat less and one of the things she points out that I think is great people hear low fat and so you have to look at what you're adding in. A lot add in a lot of sugar and we're learning more and more that simple sugar is really bad for us. I think everyone on the show knows how I eat in the morning and, you know, the left is probably more my speed but I eat a lot in the morning. I'll have the protein and taper get hungry if I just have yogurt. I really do. For me it's a mix and match. We talked about this before but I come down more on the mediterranean diet which is lots of fresh fruits and vegetables. Not simple sugars but complex carbohydrates. Whole grains that leave you feeling fuller longer but I have some bacon. I have some eggs. It's a mix there. Everything in moderation. This debate is going on and on. What's disturbing she says she doesn't exercise. That's where you draw the line. When she said that, it really ground me to a halt. You got to exercise. That's so important for health? That's the biggest thing here for sure. Thanks, rich. A lot of other stories

This transcript has been automatically generated and may not be 100% accurate.

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