I doubt its actually the unsaturated fats that are the issue, its more about the source. The sources that are most thought of is nuts and seeds like he said are full of anti nutrients. Then vegetable oils which are so oxidized by the time you consume them that its more like ingesting poison. And the list goes on. I bet if a study on unsaturated fats were done on whole sources of easy to digest foods such as avacado then there would be no harm to your body.