Dr. Eades in PP explains that insulin spikes and insulin resistance release cortisol and adrenaline among other things (stress response). In other words, high insulin causes your body to increase cortisol to keep the anabolic/catabolic balance.
Supplements to reduce cortisol:
VitalPet, 5-Androstenediol are used to inhibit cortisol. Vitamin C will bring cortisol into balance.
http://www.geocities.com/gittleman1/do00005.htm
Another supplement that may help with the muscle-building process is the brain nutrient phosphatidylserine. Several studies show that this nutrient, which is primarily known to accelerate brain function, may reduce cortisol levels as well (Monteleone et al. 1990, 1992). Cortisol is one of the primary catabolic hormones in the body and is typically secreted in response to physical trauma or prolonged stress. In one study, when 800 mg of phosphatidylserine was administered for 10 days, it significantly reduced cortisol levels in response to physical exercise. Conjugated linoleic acid (CLA) protects muscles against catabolic wasting while helping to reduce excess body fat (Miller et al. 1994; Sisk et al. 2001).
http://www.lef.org/protocols/prtcl-078.shtml
Long-term use of phosphatidylserine is safe and has not been found to produce adverse effects. Phosphatidylserine is not contra-indicated with any known medication. Phosphatidylserine is derived from soybean lecithin. Those allergic to Soya products should use with caution.
http://www.greencanyon.com/products/r100015.htm
Conjugated Linoleic Acid (CLA)
CLA occurs naturally in whole milk and red meat. A collective term used to designate a mixture of positional and geometric isomers of the essential fat linoleic acid. It is actually a fat, derived from linoleic acid (an essential fatty acid). Studies have shown that CLA can increase lean body mass and decrease fat, inhibit the growth of tumors and enhance immune function. CLA is found naturally in beef, cheese and whole milk.
http://www.angelfire.com/nj/sports22/nutrition.html
CLA is the best known anti-cancer substance. It naturally occurs in food and it is safe.
Excess cortisol in your body though is quite harmful.