On Erin Burnett’s show Out Front, the nutritionist said that soda is unhealthy, as it can cause bloating and does not hydrate a person properly.
The bottom line is that it is an alleged Diet Coke habit and cannot be confirmed on-the-record, even by the New York Times.
Trump disputed the New York Times article and called it fake news, but did not dispute the Diet Coke claim:
Another false story, this time in the Failing @nytimes, that I watch 4-8 hours of television a day – Wrong! Also, I seldom, if ever, watch CNN or MSNBC, both of which I consider Fake News. I never watch Don Lemon, who I once called the “dumbest man on television!” Bad Reporting.
— Donald J. Trump (@realDonaldTrump) December 11, 2017