US President Donald Trump is due to undergo his first medical examination on Friday, so what should he expect?
When Trump sits at the Walter Reed Medical Center in Bethesda, Maryland, he will have good news and bad news for his doctor.
First the good
Trump does not drink alcohol and never does. He says he learned this from the experience of his older brother Fred, who was an alcohol addict and died at the age of 43.
He also does not smoke. "I see people smoking, it seems scary to me," Trump said in remarks in 2015.
Bad news
A book published recently in the United States reveals that Trump relied on "four sets of foods" during his election campaign:
Mcdonald's Food Restaurants
Kentucky Food Restaurants
the pizza
Sugar-free Coca-Cola Drink
According to the book, co-authored by former director of the Trump campaign, Corey Lewandowski, Trump's main meal may consist of two Big Mac meals, two fish fillets or a milkshake.
Calories in this meal are 2,430 calories, and men are advised to get 2500 calories a day.
Moreover, Trump seems unconvinced about exercise, although he plays golf, but he moves in a light sports vehicle. 
According to one source, Trump believes that the human body "like a battery, contains a limited amount of energy exhausted with use."
So as we said. Good news and bad news.
For a man whose drawer is full of "sweetened chips, chips and Oreo chocolates," the president seems to be in good health.
In September of 2016, two months before the presidential election, Trump revealed his medical records.
The total cholesterol ratio is 169, which is good, while cholesterol levels are low and high density is also healthy.
Trump's blood pressure (116/70) was at an "ideal" level, and liver and thyroid function normally, and the recent colonoscopy did not reveal any problems.
"In short," wrote Trump's long-time physician Harold Bornstein: "Mr. Trump is in excellent physical health."
But Sara Keat, a London doctor, believes Trump is risking his diet, but "scary".
"Not only does he eat high-fat foods with high salts, but he is unlikely to eat vegetables and fruits because he consumes large amounts of other foods."
"A diet that includes a little fruits and vegetables, and much saturated fat, is likely to contribute to coronary heart disease, cancer and diabetes." 
Chiata says Trump benefits from not smoking or drinking, but exercise is vital.
"Of course, alcohol and cigarettes are a major cause of many health problems, but not exercising is almost as dangerous for heart disease as smoking," she says.
"People who do not exercise are twice as likely to develop heart disease as those who exercise regularly."
So the human body is not like a battery with a limited amount of energy.
"That's not what I know," says Dr. Keat.
"Of course, over-exerting exercise is likely to exhaust and tear joints," she said.
"But regular exercise, for half an hour a day for five days a week, is absolutely desirable."
Although President Trump's mental health has recently been questioned, the prospective examination will not be on that side.
A Trump spokesman on Twitter said: "He is very intelligent and fast-paced."
Trump commented on the subject, describing himself in another way, saying it was "a very balanced genius."
Trump is not obliged to announce the results of his medical examination publicly, but a spokeswoman said White House doctor Ronnie Jackson would announce a "summary" of the examination.
Dr. Jackson announced a two-page summary of the last medical examination of former President Obama in March 2016.
So if Trump went to the doctor's clinic, Sarah Keat, what would you recommend?
"We know that improving diet and exercise reduces the risk of disease and death from chronic diseases," she says.
"If you think you're doing well on one side, that does not mean you can completely overlook the other." 
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