I think Omega 6 fats contribute to heart disease and may also contribute to diabetes. It is one of the biggest changes in the Western diet over the past 100 years, we now eat 4x as many Omega 6s as Omega 3s and it used to be the exact opposite ratio. I notice when I'm on a keto diet (primarily sat fats and omega 3s), even my stool seems healthier. Many other benefits too.