POSTULATE: History is the past. The past is before the present. People are in the present. In the present, people lie. A lie is the opposite of a truth. Since the past was once the present, and people lie in the present, then people are in the past and therefore lied in the past. Since accounts of history are told by people, and people lie, then some history is therefore a lie. Since some history is a lie, then all history is possibly a lie as all history is made of parts of history and a part of history is only some of history. If all history is possibly a lie, then possibly all conclusions based on history are wrong. Lies are wrong. Therefore all conclusions based on history are possibly lies. Since all conclusions are based on history (name one that isn't), all conclusions are possibly wrong, and therefore lies. Since every thought process makes conlusions, possibly every thought is a lie. Since "eat brocolli because it is good for you," "studies show...," and "experts say..." are thoughts, they are all possibly lies.
CONCLUSION: Experts don't exist, studies don't show, and brocolli is poisonous.
Lesson: Think for yourself. And don't trust reasoning too much, as anything can be reasoned into legitimacy. And don't over philosophize on anything.