Of course we do know a few things. We do know his diet under any food nutritionist’s advice is not particularly healthy. We do know he gets very little exercise even while golfing. We do know that he dictated a 2015 medical exam letter from his doctor, who admitted same, describing his blood pressure as ‘astonishingly excellent’ whatever that means (either your blood pressure is within normal bounds or it is not). He also had his doctor say “if elected, Mr. Trump, I can state unequivocally, will be the healthiest individual ever elected to the presidency.”
So we do know that he will self-promote to the extent of lying and cheating about his health.
Pete