The study links a high fat diet to diabetes:<p>&quot;The current study adds weight to the longstanding recommendation to restrict total fat and saturated fat. While adjusting for BMI eliminates the effect, this does not mean that dietary fat is not important. It is biologically plausible that high-fat diets promote weight gain, which then promotes insulin resistance. There is a large body of evidence that supports this view.&quot;<p>It also references the large body of evidence that high-fat diets are associated with impaired insulin:<p>&quot;A large body of experimental data generated in laboratory animals strongly supports the notion that high-fat diets are associated with impaired insulin action. It appears from animal studies that saturated fats, in particular, have the most detrimental effects. Based on this information, along with the known risks of high saturated fat intake on cardiovascular disease risk, professional organizations such as the American Diabetes Association, the American Heart Association, and the U.S. Department of Agriculture have made recommendations that Americans aim for a total fat intake of no more than 30% of calories and choose foods low in saturated fat.&quot;<p>I wouldn&#x27;t describe it as tenuous.  But this is just one review of a study. There is a lot more out there. It doesn&#x27;t necessarily need to be the most recent to be substantive.