, Dec 2010). While these observations are intriguing, they derive from small and short-term studies and evaluate dietary manipulations that do not recapitulate diets that human beings generally eat. There is growing recognition that studying dietary patterns rather than single nutrients may result in a better understanding of the relationship between diet and health (Hu, Feb 2002). Recently, there has been much interest in differential health effects associated with Mediterranean versus

Western diet patterns. The proportion of calories that come from protein, carbohydrates, and fats in Western and Mediterranean diets are similar. However, Western diets contain protein and fat derived mainly from animal sources, thus the diet is high in saturated fats and low in monounsaturated and omega-3 fatty acids. The Mediterranean diet pattern GSI-IX contains protein and fats derived mainly from plant sources. Compared to the Western diet pattern, the 17-AAG ic50 Mediterranean diet is high in monounsaturated fatty acids, omega-3 fatty acids, complex carbohydrates, and fiber, and low in refined sugars (A. R. S. U.S Department of Agriculture, 2007-2008 and Bedard et al., Oct 28 2012). In population studies, the Western diet pattern is associated with

greater perceived stress and higher urinary cortisol levels (Laugero et al., Feb 2011), whereas the Mediterranean diet pattern is associated with lower perceived stress (Hodge et al., Mar 2013). Recently we gathered 24 h HR data via telemetry from 42 socially housed monkeys at 3 time points: six months

after consuming a low-fat plant-based prudent diet (monkey chow), and 18 and 34 months after consuming a Western diet. Subordinate HRs were higher on average, but not statistically different while consuming the prudent diet (Fig. 3A: p = 0.34). Social status differences emerged over time while consuming the Western diet ( Fig. 3B, C: 18 months p = 0.13, 34 months p = 0.002). Subordinates also lost much of their HR circadian rhythm by 34 months ( Fig. 3C: time × status interaction p = 0.005). In contrast, dominant HRs changed little with changes in diet. These data suggest that the Western diet may deleteriously affect the autonomic nervous system (ANS) of subordinates but not dominants (Shively, unpublished data). before However, confirmation of these diet-by-social status interactions requires a parallel arm study in which a prudent diet is compared to a Western diet. The cortisol response to ACTH challenge indicates adrenal responsivity to hypothalamic-pituitary activation. In intact and ovariectomized cynomolgus macaques consuming a Western diet, we have observed that dominants have lower cortisol responses to ACTH than subordinates (Shively, Nov 1 1998 and Kaplan et al., 1986) (Fig. 4A). These observations were interpreted as indicating that the adrenal glands of subordinates are hyperresponsive and contribute to hypercortisolemia.