The screening was carried out using a test called the Montreal Cognitive Assessment, on which Trump scored 30/30, Jackson said. But if they score well that usually indicates there is pretty good cognitive function.
"He's very sharp. He's very articulate when he speaks to me", Jackson said.
Asked about a much-discussed episode in which the president seemed to slur his words during a televised speech in December about the Middle East, Jackson said it might had been caused by Sudafed, a medicine for nasal congestion.
Trump's cognitive assessment was conducted what was supposed to be a purely physical examination of the president's health.
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"He has gone above and beyond what I would consider a requirement to demonstrate his cognitive abilities", Jackson said and added about the exam: "It does rule out the need to do any other cognitive assessment".
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At 6-foot-3 and 239 pounds, the 71-year-old president had a blood pressure reading of 122/74 and a resting heart rate of 68 beats per minutes.
At his weight and height, the president is borderline obese. In fact, Jackson went out of his way to specifically draw attention to President's healthy heart.
Jackson also attributed his health to abstinence from tobacco and alcohol.
As for medicines, Trump now has prescriptions for Crestor, for lowering cholesterol; Aspirin; Propecia, for hair loss; Soolantra Cream for rosacea; and a multivitamin.
Asked how the president could achieve these results given his age and reported predilection for junk food, cable TV and a largely sedentary lifestyle, Jackson responded: "Some people have just great genes".
Trump will be making some changes to his diet and exercise in an effort to lose weight.
"He is more enthusiastic about the diet part than the exercise part, but we're going to do both", Jackson said. "He has a very unique ability to just get up in the morning and just reset".
Mr. Trump takes 10 mg daily of the cholesterol-lowering drug Crestor, and the doctor said he intends to increase that dosage.