Ivana weighs in on Trump: 'His only weakness is the Big Mac'
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Ivana Trump says her ex-husband, President TrumpDonald John TrumpTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada MORE, is the picture of health ... except for one well-documented guilty pleasure: "His only weakness is the Big Mac."

The commander in chief's ex-wife weighed in on Trump's eating habits in a Tuesday interview with the New York Post.

“I can tell him 100 times, but he does what he wants anyway,” Trump, 69, told the paper of her former spouse's eating routine.

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Ivana Trump, a former model, said her 71-year-old former husband's weight has fluctuated over the years from about 178 pounds to 225 pounds.

“He looks very, very good and is very healthy,” Trump said.

Ivana Trump opened up about the president's culinary preferences while promoting the "Italiano Diet" with Gianluca Mech, which the Post described as a "range of specially formulated pastas, pizzas, cookies and other treats that are low in carbs and high in fiber."

An invitation obtained by ITK to a Trump- and Mech-hosted launch event Wednesday for the diet says those battling the bulge can "eat pasta, cookies and lose weight."

President Trump's penchant for fast food — particularly for McDonald's famed two-beef-patty specialty — is no secret.

Corey LewandowskiCorey R. LewandowskiThe Hill's Morning Report — Sponsored by Better Medicare Alliance — Facing major hurricane, Trump is tested Bannon seeks to boost Republican turnout in midterms with new film GOP destroyed oversight — Dems obligated to clean up mess if elected MORE and David Bossie, Trump's former presidential campaign manager and ex-top aide, respectively, wrote in a book released last year that their boss’s go-to McDonald's order consisted of two Big Macs, two Filet-o-Fish sandwiches, and a chocolate shake.

Ivana and Donald Trump, who split in 1992, are parents to Donald Jr., Ivanka and Eric TrumpEric Frederick TrumpAvenatti attacks Trump campaign over fundraising photo: 'What a joke' Ex-Trump, progressive strategists battle over charges of anti-Semitism surrounding Eric Trump Bill Kristol slams Eric Trump over 'shekels' comment MORE.

“None of my kids are obese," Ivana Trump told the Post, "they’re all tall and slim and handsome and smart. And the grandkids are exactly the same — good genes.”