Jackson past year concluded that Trump was in "excellent health" despite his physical exam that time showing him borderline obese and his "bad cholesterol" levels rising.
He didn't undergo any procedures requiring sedation or anesthesia, Conley said.
Trump, 72, was to be put through a round of medical tests at Walter Reed National Military Medical Center in nearby Bethesda, Maryland, that will determine his weight, cholesterol, blood pressure and other health factors.
As for his diet, Trump's love of fast food remains.
Jackson's assessment of the President's health came under fire from medical professionals, including from within the White House's medical unit.
Not for Trump the basketball sessions that Barack Obama sweated through in the White House, or the bike rides of George W Bush.
Trump weighed 239 pounds (108 kg) at last year's physical.
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In January, Trump hosted the strapping athletes of America's champion college football team, the Clemson Tigers, with a mountain of hamburgers and pizzas.
Modern-day presidents have undergone regular exams to catch any potential problems but also to assure the public they are fit for office.
President Trump is in great health according to the results of his latest physical exam.
Jackson withdrew his name from consideration for the post in April amid accusations of ethical misconduct, including that he recklessly prescribed drugs and wrecked a government vehicle. Jackson, who is still under investigation, will also travel and work closely with White House staff.
Jackson reported that Trump, at 6-foot-3, was slightly overweight at 239 pounds past year.
Last year, doctors checked the president's eyes; ears, nose and throat; heart; lungs; gastrointestinal tract; skin; and teeth.
According to a CNN report, the physical is expected to be conducted by Dr. Sean Conley who took over for Ronny Jackson a year ago.