"He has incredible cardiac fitness at this point in his life and I think a large part of that is due to the fact he has had a life of abstinence from tobacco and alcohol", Dr Jackson said.
"The president's overall health is excellent", said Jackson, who predicted Trump would remain healthy for the duration of his presidency despite a diet heavy on fast food and an exercise regime limited to weekend golf outings.
President Trump should lose some weight, exercise more and scale back on his beloved Big Macs, but his ideal score on a cognitive test suggests there's "no reason whatsoever" to doubt his mental fitness, his doctor said.
Trump's health information was published on Tuesday in the "President's Periodic Physical Exam", his first physical since taking office.
Jackson answered questions for almost an hour, discussing the results from Trump's physical in fine detail-but the overall takeaway was that the President is in great mental and physical shape. Dr Jackson said the president had asked him to carry out a cognitive test to dispel these rumours.
'The reason that we did the cognitive assessment is, plain and simple, because the president asked me to do it'.
"It's a screening assessment that we use routinely in the clinics to determine whether someone has some degree of cognitive impairment or not", he said.
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Knopman called the test "reliable and valid", noting that it's been around about 10 years, but said it doesn't tell us everything.
The good news about his health followed rather worse news about his poll ratings, after it emerged he had the lowest approval of any elected president in the first year. "And I think he wasn't the least bit concerned that he had anything to hide". "It does rule out the need to do any other cognitive assessment", Jackson said.
But he did say that Mr. Trump's weight is 239 pounds and that he is too sedentary.
As for those bone spurs that exempted a young Trump from the military draft, he was not examined for any at this time, because the president has made no complaint about podiatric health, Jackson said.
He said he had not planned to test Mr Trump's cognitive ability because in his daily interactions: "He's very sharp".
Perry said she believed presidents should be subject to a raft of tests to establish they are fit to serve.
Mr Trump's good health could also be down to his genes, Dr Jackson suggested.
"He has a history of elevated cholesterol, and is now on a low dose of Crestor".