Marion Nestle was amused when Coca Cola recently announced it would sell a version of its soda sweetened with cane sugar instead of high-fructose corn syrup.

“That’s so funny. I just laughed and laughed when I heard that,” Nestle tells TODAY.com.

“ Substituting cane sugar for that will make absolutely no difference biochemically. ... Coca Cola will still be Coca Cola. It will not be a health food.”

At 89, Nestle has been a prominent voice in nutrition for decades, speaking out about food’s impact on health, the importance of preventing obesity , how the food industry influences what people eat and the politics of food safety.

The No. 1 biggest problem in American diets is that people eat too much, she says.

Nestle is candid, energetic, and still working and writing, including her

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