George Henderson put up this link in comments to the last Surwit postSmall Amounts of Dietary Medium-Chain Fatty Acids Protect Against Insulin Resistance During Caloric Excess in Humans
This was the first hit:
Fat, carbohydrate, and calories in the development of diabetes and obesity in the C57BL/6J mouse
Differential effects of fat and sucrose on the development of obesity and diabetes in C57BL/6J and A/J mice
Diet-Induced Type II Diabetes in C57BL/6J Mice
Modern Bio-Serve F1850 is a lard based high fat diet, so we'll never quite know which diet we are talking about in the restricted feeding regimen. However the question is the same: Do "high fat" diets work by sensitising adipocytes to over respond to insulin? Be that linoleic acid from lard or medium chain fatty acids from coconut oil.