The 30-point test is used to quickly detect "mild cognitive dysfunction" and according to Dr Jackson rules out "the need to do any other cognitive assessment". The president has a resting heart rate of 68 and a blood pressure reading of 122/74.
"So I was not going to do a cognitive exam".
Trump had requested the test after criticism of his decision-making, with some people saying he may be suffering from dementia, including Alzheimer's Disease.
Trump now takes a low dosage of Crestor, a cholesterol medication, which is being increased, Propecia for baldness, a daily aspirin, and a medication for rosacea, a common skin problem.
He said that in all his conversations with Trump, the president has been "very articulate".
"It's called genetics", Jackson said.
"He said, 'I want you to get out there and I want you to talk to them and I want you to answer every single question they have, '" Jackson said of Trump .
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He also reported the 6-foot-3 president weighed in at 239 pounds - three pounds heavier than he was in September 2016, the last time Trump revealed his weight to the public.
Jackson, who speaks with Trump a few times a day and travels with him, said he did not think the president needed cognitive testing based on medical guidelines - but added the 30-question Montreal Cognitive Assessment at Trump's request. The president is "more enthusiastic about the diet part than the exercise part", his physician allowed.
As far as the President's mental health.
Dr Jackson said the firebrand Republican, who weighs 17 stone, needs to lose 10 to 15 pounds over the next year and prescribed a diet low in fat and carbs as well as exercise.
Asked how a man whose diet consists of fast food and whose only known exercise is driving his golf cart on the green could nevertheless appear in such relatively good health, Jackson chalked it up to the president's "incredible genes".
"Absolutely, he's fit for duty, I think he will remain fit for duty for the remainder of his term", said Dr. Ronny Jackson, who oversaw Trump's first annual physical exam as president last Friday. Jackson said he would increase that dose in an effort to get Trump's so-called "bad" cholesterol, or LDL level, below 120; it now is 143. He does however take daily medication, Propecia, for hair loss, a multivitamin and also medication for rosacea, which causes red skin.
The results were released with the president's consent, Jackson said in an official memorandum sent to White House Press Secretary Sarah Sanders.