The piece of evidence in the passage that is not relevant and should be removed or replaced is:
“Most people find oatmeal a little bland and so they add sugar, honey, fruit, or nuts.”
This statement does not directly contribute to the main argument about the nutritional differences between old-fashioned oats and quick oats. Instead, it focuses on a subjective preference regarding oatmeal flavor, which detracts from the discussion of cooking time and nutritional value.