It’s no secret that Donald Trump loves fast food.

We know that his go-to McDonald’s order is “two Big Macs, two Fillet-O-Fish, and a chocolate malted.”

We also know that he “never ate the bread” in his fast food binges.

But it was never clear exactly why the US President is so partial to a McDonald’s. Until now.

No, it’s not just because he loves salty, greasy food - it’s because Trump is afraid of being poisoned.

According to a new book, Fire and Fury: Inside the Trump White House, POTUS likes fast food because no one knows he’s going to be there so there’s no chance of anyone tampering with the food.

“He had a longtime fear of being poisoned, one reason why he liked to eat at McDonald’s — nobody knew he was coming and the food was safely premade,” writes author Michael Wolff, revealed in an excerpt of the book published by New York Magazine.

The book sheds light on a seemingly paranoid side to Trump’s personality.

Wolff claims that the President didn’t want White House staff touching anything in his room, “especially not his toothbrush.”

“He ­reprimanded the housekeeping staff for picking up his shirt from the floor,” says Wolff, adding that Trump reportedly said: “If my shirt is on the floor, it’s because I want it on the floor.”

Wolff also says that if the President wasn’t having dinner with Steve Bannon, he could likely be found in bed at 6.30pm, with a cheeseburger and three screens.

From there he would make calls to a small group of friends, “who charted his rising and falling levels of agitation through the evening and then compared notes with one another.”