Create a hypothesis, do experiments, examine the evidence, revise the hypothesis. Then, restrict your claims to the hypothesis and evidence. 'Knowing anything'

Create a hypothesis, do experiments, examine the evidence, revise the hypothesis. Then, restrict your claims to the hypothesis and evidence. 'Knowing anything' is irrelevant and the assertion that 'we know so little about nutrition', etc. in this context is facetious and disingenuous.