The Bitter Truth About Sugar by Robert Lustig (Full Transcript)

Robert Lustig

Robert H. Lustig, a Professor of Clinical Pediatrics at University of California, San Francisco (UCSF), here details and explores the real truths about sugar that you perhaps never heard about much before. We thought it might be useful for our readers. So we decided to do a full transcript on his about 90-minute YouTube video called “Sugar: The Bitter Truth”. Hope you find it useful and informative. Please use the “The Bitter Truth About Sugar” slides below while reading this transcript…

The Bitter Truth About Sugar by Robert Lustig Slides (PDF)



I’m going to tell you tonight a story and this story dates that about 30 years. This story has a little bit of something for everybody. It has a little bit of biochemistry, a little bit of clinical research, a little bit of public health, a little bit of politics, a little bit of racial innuendo. The only thing it’s missing is sex. But well, we can see what we can do about that too.

By the end of the story, I hope I will have debunked the last 30 years of nutrition information in America. And I would very much appreciate if at the end of the talk you would tell me whether or not I was successful or not.

Atkins versus Japanese diet

Okay. So in order to get you in the mood as it were, let’s start with a little quiz. What do the Atkins diet and the Japanese diet have in common? Anybody? Well you have the answers right – yes, never mind, that’s right. You have the answer right there.

So the Atkins diet of course is all fat, no carb. The Japanese diet is all carb, no fat. They both work. So what do they share in common? They both eliminate the sugar fructose. With that, think about what it means to be on a diet and what macro-nutrients you are eating and which ones you’re not. And then we’ll go from there and I’ll try to explain how this all works.

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So you’ve all heard about the obesity epidemic. Here are the numbers. These are the Anne Haines database body mass index (BMI). Everybody knows what that is now. Histograms marching ever rightward as time has gone on… this was what was projected for 2008 in blue. We had so far exceeded and surpassed this – it’s not even funny – from 2003. The reason I show this is not just to show that the obese or getting obese, or of course that’s true, but in fact, the entire curve has shifted. We all weigh 25 pounds more today than we did 25 years ago, all of us.

Now it is often said that obesity is the ultimate interaction between genetics and environment. But having said that our genetic pool did not change in the last 30 years. So tonight we’re going to talk about the environment rather than genes.

Obesity epidemic

Now in order to talk about the environment we need to talk about what is obesity, and of course, you’re all familiar with the basic concept of the first law of thermodynamics, which states that the total energy inside a closed system remains constant. Now in human terms, the standard interpretation of this law is the following: If you eat it, you better burn it or you can store it. Now who here believes that? Oh come on, you all do.

I used to believe that. I don’t anymore. I think that’s a mistake. I think that is the biggest mistake and that is the phenomenon I’m going to try to debunk over the course of the next hour, because I think there’s another way to state the law, which is much more relevant and much more to the point. Before I get there, of course, if you believe that these are the two problems: calories in, calories out, two behaviors – gluttony and slough. After all you see anybody on the street, he’s a glutton and slough. You know Tommy Thompson said it on the TV show, “we just eat too damn much”.

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