Newt Gingrich memoir from time on the campaign trail reveals disturbing details about the Trump diet
Donald Trump eating McDonald's fast food aboard his private jet (screengrab from the president's Instagram account)

The diet of Donald Trump is once again under scrutiny due to allegations about the president's eating habits made by a campaign advisor.

Former Speaker of the House Newt Gingrich provided an advance copy of his new book, "Understanding Trump" to the Washington Examiner.

"Anytime a meal was served when I flew with candidate Trump aboard his nicely outfitted 757, it was invariably McDonald's, Wendy's, or a similar fast food," Gingrich wrote. His new book is being billed as a tell-all from what Speaker Gingrich learned of Trump while advising his 2016 campaign and new White House administration.

Gingrich is not the only former Speaker of the House of Representative's to take note of the president's health.

“I think his family should be concerned of his health," Rep. Nancy Pelosi (D-CA) said on MSNBC Thursday. "I'm concerned about his fitness for office."

White House staff are now catering to Trump's diet and egotism.

"As he settles down, they bring him a Diet Coke, while the rest of us are served water, with the Vice President sitting at one end of the table. With the salad course, Trump is served what appears to be Thousand Island dressing instead of the creamy vinaigrette for his guests. When the chicken arrives, he is the only one given an extra dish of sauce. At the dessert course, he gets two scoops of vanilla ice cream with his chocolate cream pie, instead of the single scoop for everyone else,” Time reported.

In May, Newsweek reported that Trump's diet would greatly complicate his first overseas trip as Commander in Chief.

Donald Trump hasn't just been criticized for what he eats, but how he eats. In 2011 it was a major scandal when Trump was spotted eating pizza with a fork while dining with former Alaska Governor Sarah Palin.

Trump wasn't just criticized for eating pizza with a knife and fork, he was also mocked for eating Kentucky Fried Chicken with a knife and fork aboard his private jet.

There was also the notorious Cinco De Mayo tweet from 2016.