A person who thinks "There's no research telling me that this new diet is ineffective,so that must mean that it's effective!" is engaging in a common error in thinking referred to as:

Question

Quizplus · Accepted Answer

This is an example of an appeal to ignorance, which is a fallacy that assumes a lack of evidence or knowledge in support of a claim means the claim is true. In this case, the lack of research confirming the ineffectiveness of a diet is being used to assume its effectiveness.

A Person Who Thinks "There's No Research Telling Me That