Is Sugar Toxic ? 

Lustig is a specialist on pediatric hormone disorders and the leading expert in childhood obesity at the University of California, San Francisco, School of Medicine, which is one of the best medical schools in the United States. He published his first paper on childhood obesity a dozen years ago, and he has been treating patients and doing research on the disorder ever since.

The viral success of his lecture, though, has little to do with Lustig’s impressive credentials and far more with the persuasive case he makes that sugar is a “toxin” or a “poison,” terms he uses together 13 times through the course of the lecture, in addition to the five references to sugar as merely “evil.” And by “sugar,” Lustig means not only the white granulated stuff that we put in coffee and sprinkle on cereal — technically known as sucrose — but also high-fructose corn syrup, which has already become without Lustig’s help what he calls “the most demonized additive known to man.”

A video on YouTube on the biochemistry of fructose and posted in July 2009 has gone viral, with more than 800,000 views so far. People are going to the site at the rate of 50,000 a month, even though it’s 90 minutes long, The New York Times reports. Calling sugar a “toxin” or a “poison” 13 times, and referring to it as “evil” five times, the video’s author, Robert Lustig explains that sugar is sugar, whether it’s the white granulated stuff – commonly known as sucrose – or high fructose corn syrup. And his stance has nothing to do with calories, according to the NYT: “It’s a poison by itself,” he says.

“If Lustig is right, then our excessive consumption of sugar is the primary reason that the numbers of obese and diabetic Americans have skyrocketed in the past 30 years,” the NYT says. “But his argument implies more than that. If Lustig is right, it would mean that sugar is also the likely dietary cause of several other chronic ailments widely considered to be diseases of Western lifestyles — heart disease, hypertension and many common cancers among them.”

The NYT added that Lustig has "a mass"  of evidence to back up his claims.

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