Stress-induced obesity and the emotional nervous system

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Stress-induced obesity and the emotional nervous system Mary F. Dallman  Trends in Endocrinology & Metabolism  Volume 21, Issue 3, Pages 159-165 (March 2010) DOI: 10.1016/j.tem.2009.10.004 Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 1 During stressful periods, there is a change in what type of food is eaten, independent of hyperphagia or hypophagia. There is a shift in food intake toward ‘comfort foods’ that is independent of whether total caloric intake increases (dashed line) or decreases (unbroken line) from normal intake (horizontal dot–dashed line). Student intake was retrospectively interrogated during periods of no stress (normal) or exam stress; the type of foods eaten and the amounts of foods were compared during the two periods. Whether or not food intake increased or decreased, the type of food ingested shifted toward the more palatable sorts. Reproduced, with permission, from Ref. [14]. Trends in Endocrinology & Metabolism 2010 21, 159-165DOI: (10.1016/j.tem.2009.10.004) Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 2 Brain structures engaged in feeding behaviors. (a) At the cortical level, the emotional brain is embedded in the anterior insula that provides ‘feelings’ and in the anterior cingulate cortex that governs ‘motivated behavior‘. (b) The limbic brain is responsible for emotional (amygdala), motivational (nucleus accumbens) and habitual (basal ganglia) responses, whereas (c) the brainstem, containing the hypothalamus, brainstem and spinal cord, regulates energy balance. Afferent inputs to the brain and to emotional and cortical structures are shown on the left, and efferent outputs from cortical and subcortical habitual and emotional structures are shown on the right. Horizontal interactions between afferent and efferent components exist at each level, and structures are also bidirectionally connected vertically. Although the hypothalamic neurons are sufficient to regulate energy intake, components in the limbic brain and frontal cortex can override the basic maintenance of energy balance and result in either an underweight or overweight phenotype. The cell groups shown in yellow represent the brainstem and spinal cord portion of the brain that is engaged with the homeostatic maintenance of energy balance. The cell groups shown in orange can cause either an increase or decrease in food intake. DA, drug addiction. Trends in Endocrinology & Metabolism 2010 21, 159-165DOI: (10.1016/j.tem.2009.10.004) Copyright © 2009 Elsevier Ltd Terms and Conditions