Another interesting study -- seems saturated fats did not affect insulin 
sensitivity in lean folks, but did in overweight people.
http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_u

ids=12145222&dopt=Abstract
Diabetes Care 2002 Aug;25(8):1283-8 Related Articles, Links 
  
Effects of diets enriched in saturated (palmitic), monounsaturated (oleic), 
or trans (elaidic) fatty acids on insulin sensitivity and substrate oxidation 
in healthy adults.

Lovejoy JC, Smith SR, Champagne CM, Most MM, Lefevre M, DeLany JP, Denkins 
YM, Rood JC, Veldhuis J, Bray GA.

Pennington Biomedical Research Center, Louisiana State University, Baton 
Rouge, Louisiana 70808, USA.

OBJECTIVE: Diets high in total and saturated fat are associated with insulin 
resistance. This study examined the effects of feeding monounsaturated, 
saturated, and trans fatty acids on insulin action in healthy adults. 
RESEARCH DESIGN AND METHODS: A randomized, double-blind, crossover study was 
conducted comparing three controlled 4-week diets (57% carbohydrate, 28% fat, 
and 15% protein) enriched with different fatty acids in 25 healthy men and 
women. The monounsaturated fat diet (M) had 9% of energy as C18:1cis (oleic 
acid). The saturated fat diet (S) had 9% of energy as palmitic acid, and the 
trans fatty acid diet (T) had 9% as C18:1trans. Body weight was kept constant 
throughout the study. After each diet period, insulin pulsatile secretion, 
insulin sensitivity index (S(I)) by the minimal model method, serum lipids, 
and fat oxidation by indirect calorimetry were measured. ....


Namaste, Liz
<A HREF="http://www.csun.edu/~ecm59556/Healthycarb/index.html">
http://www.csun.edu/~ecm59556/Healthycarb/index.html</A>