Cognitive tests like the one USPresident Donald Trump aced give doctors a snapshot of someone's memory and certain other neurologic functions.
"The 6'3" president now weighs 239 pounds, Jackson said - 3 pounds heavier than he was in September 2016, the last time Trump revealed his weight to the public. Mr Trump, 71, is known to enjoy high-fat foods like fried chicken, hamburgers and steak - and, while he plays golf, he does not have a daily exercise routine.
"I mean I walk, I this, I that", Trump said.
Jackson said that Trump's "overall health is excellent", adding that the president had mostly normal results on several tests of his cholesterol and heart health. At that height, he is one pound from being considered officially obese.
Mr Trump's levels of artery-clogging bad cholesterol and total cholesterol were both below the recommended limits.
Mr Trump has a resting heart rate of 68 beats per minute.
After fully examining Trump, Jackson concluded that the president is "in excellent health." His Twitter feed is often a clear indication of what he is watching as he taps away on the screen in front of him, posting tweets that often replicate Fox News chyrons and tagging guests who made a point he liked on air while denigrating those who didn't. Those were the words of the official White House physician, Ronny Jackson, but doubts have been raised nonetheless. That led to Jackson's "genetics" remark and stated that he thought the President's diet has been different since moving into the White House.
Mr Trump's mental fitness for the job had come under scrutiny after a recently published, controversial book, Fire And Fury: Inside The Trump White House, portrayed him as childlike and mercurial.
Navy doctor Ronny Jackson, who administered Trump's first presidential physical last week, said Trump received a ideal score on a test created to detect early signs of memory loss and other mild cognitive impairment. Sample questions include asking the patient to draw a clock face, putting in all of the numbers and setting the clock hands to a specific time.
"What it can tell you is that at least in a brief screening test there was no significant cognitive impairment", said Gordon, who was not involved in examining Mr. Trump.
The president's doctor said Trump appears to depend on only four or five hours of sleep a night, though he added later that Trump and most adults would benefit from more sleep. To figure out what causes the worrisome traits President Trump exhibits - disordered decision-making, an insatiable need for affirmation, little impulse control, confusion about facts, difficulty foreseeing consequences - you'd need more extensive tests, a psychological exam and an MRI. The exam was held January at Walter Reed National Military Medical Center in Bethesda, Maryland.