This study came to my attention after visiting http://www.marksdailyapple.com/. The study is from the University of California San Francisco School of Medicine. The last sentence is telling.
Conclusions:Even short-term consumption of a paleolithic type diet improves BP and glucose tolerance, decreases insulin secretion, increases insulin sensitivity and improves lipid profiles without weight loss in healthy sedentary humans.European Journal of Clinical Nutrition advance online publication, 11 February 2009; doi:10.1038/ejcn.2009.4.
http://www.ncbi.nlm.nih.gov/pubmed/19209185?dopt=Abstract
A bit off topic, but natural fat is nothing to fear. It is a wonderful source of energy and nearly hormonally neutral. This means you won't have a huge insulin spike when you consume fat. Remember, big insulin spikes signal the body to store energy as body fat. Enormous amounts of anything may trigger an insulin response, so don't eat the whole jar of almond butter as I once did!
Grass fed, free range beef and chicken, wild salmon and the like are all great sources. When you consume feed lot meat, I'd trim the fat a bit. The ratio of Omega 6 fatty acids to Omega 3 fatty acids is very high in animals that have been fed the atrocious low fat grain diet. The best ratio is 2:1 or 1:1.
Skip the man made fat (trans fat, partially hydrogenated stuff, etc.). They are terrible.
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