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https://www.readbyqxmd.com/read/29352524/effects-of-physical-activity-and-sedentary-behavior-on-brain-response-to-high-calorie-food-cues-in-young-adults
#1
Shan Luo, Sydney G O'Connor, Britni R Belcher, Kathleen A Page
OBJECTIVE: Physical activity (PA) promotes weight maintenance, potentially because of its beneficial effects on feeding behavior regulation via diminished food cue reactivity within brain reward regions. This study examined how levels of PA and sedentary behavior (SB) relate to brain responses to food cues. METHODS: Participants (22 lean, 18 with obesity) completed three to five PA recalls over 2 months. Average minutes per day of moderate to vigorous PA (MVPA) and SB were calculated...
January 19, 2018: Obesity
https://www.readbyqxmd.com/read/29350563/dietary-advanced-glycosylation-end-products-dages-and-melanoidins-formed-through-maillard-reaction-physiological-consequences-of-their-intake
#2
Cristina Delgado-Andrade, Vincenzo Fogliano
The main purpose of this review is to clarify whether the consumption of food rich in melanoidins and dietary advanced glycosylation end-products (dAGEs) are harmful or beneficial for human health. There are conflicting results on their harmful effects in the literature, partly due to a methodological issue in how dAGEs are determined in food. Melanoidins have positive functions particularly within the gastrointestinal tract, whereas the intake of dAGEs has controversial physiological consequences. Most of the in vivo intervention trials were done comparing boiled versus roasted diet (low and high dAGE, respectively)...
January 18, 2018: Annual Review of Food Science and Technology
https://www.readbyqxmd.com/read/29350126/a-review-of-the-neurobiology-of-obesity-and-the-available-pharmacotherapies
#3
Mehala Subramaniapillai, Roger S McIntyre
Obesity is becoming an increasing problem worldwide. In addition to causing many physical health consequences, there is increasing evidence demonstrating that obesity is toxic to the brain and, as such, can be considered a disease of the central nervous system. Peripheral level regulators of appetite, such as leptin, insulin, ghrelin, and cholecystokinin, feed into the appetite center of the brain, which is controlled by the hypothalamus, to maintain homeostasis and energy balance. However, food consumption is not solely mediated by energy balance, but is also regulated by the mesolimbic reward system, where motivation, reward, and reinforcement factors influence obesity...
December 2017: CNS Spectrums
https://www.readbyqxmd.com/read/29339315/insulin-sensitivity-predicts-brain-network-connectivity-following-a-meal
#4
John P Ryan, Helmet T Karim, Howard J Aizenstein, Nicole L Helbling, Frederico G S Toledo
There is converging evidence that insulin plays a role in food-reward signaling in the brain and has effects on enhancing cognition. Little is known about how these effects are altered in individuals with insulin resistance. The present study was designed to identify the relationships between insulin resistance and functional brain connectivity following a meal. Eighteen healthy adults (7 male, 11 female, age: 41-57 years-old) completed a frequently-sampled intravenous glucose tolerance test to quantify insulin resistance...
January 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29337278/effects-of-hunger-state-on-the-brain-responses-to-food-cues-across-the-life-span
#5
L Charbonnier, F van Meer, A M Johnstone, D Crabtree, W Buosi, Y Manios, O Androutsos, A Giannopoulou, M A Viergever, P A M Smeets
The abundant exposure to food cues in our environment is one of the main drivers of overconsumption. Food evaluation is important for the regulation of food intake by the brain and it's interaction with hunger state. Children are especially susceptible to food cues. Understanding the mechanisms behind this regulation in healthy individuals across the life span can help to elucidate the mechanisms underlying overconsumption and aid the development of future obesity prevention strategies. Few functional neuroimaging studies have been done in children and elderly...
January 11, 2018: NeuroImage
https://www.readbyqxmd.com/read/29330488/motor-skill-learning-and-reward-consumption-differentially-affect-vta-activation
#6
Susan Leemburg, Tara Canonica, Andreas Luft
Dopamine release from the ventral tegmental area (VTA) terminals in the primary motor cortex (M1) enables motor skill acquisition. Here, we test the hypothesis that dopaminergic VTA neurons projecting to M1 are activated when rewards are obtained during motor skill acquisition, but not during task execution at plateau performance, or by rewards obtained without performing skilled movements. Rats were trained to perform a skilled reaching task for 3 days (acquisition) or 7 days (plateau). In combination with retrograde labelling of VTA-to-M1 projection neurons, double immunofluorescence for c-fos and tyrosine hydroxylase (TH) was used to assess activation of dopaminergic and non-dopaminergic VTA neurons...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329692/potential-psychological-neural-mechanisms-in-binge-eating-disorder-implications-for-treatment
#7
REVIEW
Hedy Kober, Rebecca G Boswell
Binge Eating Disorder (BED) is a newly-established eating disorder diagnosis in the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). Although systematic research on BED is in its infancy and many studies feature small samples, several observations emerge. First, we review diagnostic, developmental, and socio-demographic features of BED. Next, although BED and obesity are linked and frequently co-occur, we review data suggesting that BED is a distinct phenotype. Importantly, we take a mechanism-focused approach and propose four psychological processes with neurobiological bases that may uniquely differentiate BED from obesity: emotion reactivity, food-cue reactivity, food craving, and cognitive control...
December 23, 2017: Clinical Psychology Review
https://www.readbyqxmd.com/read/29325757/the-role-of-fatty-acids-and-their-endocannabinoid-like-derivatives-in-the-molecular-regulation-of-appetite
#8
REVIEW
Renger F Witkamp
Intake, absorption and synthesis of fatty acids, including those produced by the intestinal microbiota are tightly monitored via specific receptors and, indirectly through their conversion into a variety of signalling molecules. The resulting information is integrated and translated to different physiological processes, including the regulation of appetite and satiation. Direct chemosensing of fatty acids takes place via interaction with free fatty acid (FFA) and other receptors. These are present in the oronasal cavity and along the entire gastrointestinal tract, in various other tissues, and, for some receptors also in brain...
January 8, 2018: Molecular Aspects of Medicine
https://www.readbyqxmd.com/read/29325557/bidirectional-associations-between-mothers-feeding-practices-and-child-eating-behaviours
#9
Elena Jansen, Kate E Williams, Kimberley M Mallan, Jan M Nicholson, Lynne A Daniels
BACKGROUND: This study examined bidirectional relationships between maternal feeding practices and child food responsiveness and satiety responsiveness from 2 to 5 years. METHODS: Mothers (N = 207) reported their own feeding practices and child eating behaviours using validated questionnaires at child ages 2, 3.7, and 5 years. Cross-lagged analyses were conducted to test for bidirectional effects, adjusting for child BMI z-score (based on measured weight and height) at 14 months...
January 11, 2018: International Journal of Behavioral Nutrition and Physical Activity
https://www.readbyqxmd.com/read/29324797/sex-dependent-impact-of-early-life-stress-and-adult-immobilization-in-the-attribution-of-incentive-salience-in-rats
#10
Silvia Fuentes, Javier Carrasco, Abigail Hatto, Juan Navarro, Antonio Armario, Manel Monsonet, Jordi Ortiz, Roser Nadal
Early life stress (ELS) induces long-term effects in later functioning and interacts with further exposure to other stressors in adulthood to shape our responsiveness to reward-related cues. The attribution of incentive salience to food-related cues may be modulated by previous and current exposures to stressors in a sex-dependent manner. We hypothesized from human data that exposure to a traumatic (severe) adult stressor will decrease the attribution of incentive salience to reward-associated cues, especially in females, because these effects are modulated by previous ELS...
2018: PloS One
https://www.readbyqxmd.com/read/29323519/pigeons-in-control-of-their-actions-learning-and-performance-in-stop-signal-and-change-signal-tasks
#11
Christina Meier, Stephen E G Lea, Ian P L McLaren
In human participants, 2 paradigms commonly assumed to measure the executive-control processes involved in response inhibition are the stop-signal and change-signal tasks. There is, however, also considerable evidence that performance in these tasks can be mediated by associative processes. To assess which components of inhibitory response control might be associative, we developed analogues of these tasks for pigeons. We trained pigeons to peck quickly at 1 of 2 keys of different colors to obtain a food reward...
January 2018: Journal of Experimental Psychology. Animal Learning and Cognition
https://www.readbyqxmd.com/read/29323515/suboptimal-choice-reward-predictive-signals-and-temporal-information
#12
Paul J Cunningham, Timothy A Shahan
Suboptimal choice refers to preference for an alternative offering a low probability of food (suboptimal alternative) over an alternative offering a higher probability of food (optimal alternative). Numerous studies have found that stimuli signaling probabilistic food play a critical role in the development and maintenance of suboptimal choice. However, there is still much debate about how to characterize how these stimuli influence suboptimal choice. There is substantial evidence that the temporal information conveyed by a food-predictive signal governs its function as both a Pavlovian conditioned stimulus and as an instrumental conditioned reinforcer...
January 2018: Journal of Experimental Psychology. Animal Learning and Cognition
https://www.readbyqxmd.com/read/29317597/preliminary-evidence-for-genetic-overlap-between-body-mass-index-and-striatal-reward-response
#13
T M Lancaster, I Ihssen, L M Brindley, D E Linden
The reward-processing network is implicated in the aetiology of obesity. Several lines of evidence suggest obesity-linked genetic risk loci (such as DRD2 and FTO) may influence individual variation in body mass index (BMI) through neuropsychological processes reflected in alterations in activation of the striatum during reward processing. However, no study has tested the broader hypotheses that (a) the relationship between BMI and reward-related brain activation (measured through the blood oxygenation-dependent (BOLD) signal) may be observed in a large population study and (b) the overall genetic architecture of these phenotypes overlap, an assumption critical for the progression of imaging genetic studies in obesity research...
January 10, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29316205/autophosphorylation-of-%C3%AE-camkii-affects-social-interactions-in-mice
#14
Zofia Harda, Jakub Mateusz Dzik, Maria Nalberczak-Skóra, Ksenia Meyza, Kacper Łukasiewicz, Szymon Łęski, Kasia Radwanska
The α-Ca2+ /calmodulin-dependent protein kinase II (αCaMKII), a key regulator of the glutamatergic synapse, has been implicated in many psychiatric disorders characterized by social impairments. Here we tested whether autophosphorylation of αCaMKII at threonine 286, which prolongs the activity of the enzyme, affects social behaviors in mice. We observed that autophosphorylation-deficient (αCaMKII-T286A) mutant female mice showed abnormal social behaviors characterized by decreased social preference and interest in conspecifics of the same sex, as compared to their wild-type littermates...
January 9, 2018: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/29315659/the-role-of-glutamate-signaling-in-incentive-salience-second-by-second-glutamate-recordings-in-awake-sprague-dawley-rats
#15
Seth R Batten, Francois Pomerleau, Jorge Quintero, Greg A Gerhardt, Joshua S Beckmann
The attribution of incentive salience to reward-predictive stimuli has been shown to be associated with substance abuse-like behavior such as increased drug taking. Evidence suggests that glutamate neurotransmission and sequential N-methyl-D-aspartate (NMDA) activation are involved in the attribution of incentive salience. Here we further explore the role of second-by-second glutamate neurotransmission in the attribution of incentive salience to reward-predictive stimuli by measuring sign-tracking behavior during a Pavlovian conditioned approach procedure using ceramic-based microelectrode arrays configured for sensitive measures of extracellular glutamate in awake behaving Sprague Dawley rats...
January 8, 2018: Journal of Neurochemistry
https://www.readbyqxmd.com/read/29315392/redefining-diabetes-and-the-concept-of-self-management-from-a-patient-s-perspective-implications-for-disease-risk-factor-management
#16
T K Masupe, K Ndayi, L Tsolekile, P Delobelle, T Puoane
The colliding epidemics of non-communicable diseases including diabetes with chronic infectious diseases in Sub-Saharan Africa requires contextualized innovative disease management strategies. This qualitative study conducted in a peri-urban township near Cape Town, South Africa aimed to identify and gain in-depth understanding of contextual and environmental issues pertinent to the patient that could influence Type 2-diabetes mellitus (T2DM) care and self-management. Participants included purposively sampled diabetics or pre-diabetics from the community, PURE study database, facility health club and health care providers...
January 5, 2018: Health Education Research
https://www.readbyqxmd.com/read/29313000/feeder-approach-between-trials-is-increased-by-uncertainty-and-affects-subsequent-choices
#17
Aaron J Gruber, Rajat Thapa, Sienna H Randolph
Animals quickly learn to approach sources of food. Here, we report on a form of approach in which rats made volitional orofacial contact with inactive feeders between trials of a self-paced operant task. This extraneous feeder sampling (EFS) was never reinforced and therefore imposed an opportunity and effort cost. EFS decreased during initial training but persisted thereafter. The relative rate of EFS to operant responding increased with novel changes to the operant chamber, reward devaluation by prefeeding, or lesions to the dorsolateral striatum...
November 2017: ENeuro
https://www.readbyqxmd.com/read/29309264/impaired-attentional-set-shifting-performance-after-exposure-to-5-cgy-of-600-mev-n-28si-particles
#18
Richard A Britten, Jessica S Jewell, Vania D Duncan, Melissa M Hadley, Evangeline Macadat, Alberto E Musto, Chiara La Tessa
Astronauts on deep space missions will be required to work more autonomously than on previous missions, and thus their ability to perform executive functions could be critical to mission success. One of the most common measures of executive function in humans is the ability to perform attentional set shifting, which requires contributions from working memory, discrimination, reversal learning, attentional set shifting and attention. Rodent attentional set shifting assays require rats to form an association between the presence of the food reward and an associative cue, which is either the digging media or the scent that is placed in the bowl; by altering the combination of scent and digging media, progressively more complex cognitive processes can be tested...
January 8, 2018: Radiation Research
https://www.readbyqxmd.com/read/29307556/bonobos-prefer-individuals-that-hinder-others-over-those-that-help
#19
Christopher Krupenye, Brian Hare
Humans closely monitor others' cooperative relationships [1, 2]. Children and adults willingly incur costs to reward helpers and punish non-helpers-even as bystanders [3-5]. Already by 3 months, infants favor individuals that they observe helping others [6-8]. This early-emerging prosocial preference may be a derived motivation that accounts for many human forms of cooperation that occur beyond dyadic interactions and are not exhibited by other animals [9, 10]. As the most socially tolerant nonhuman ape [11-17] (but see [18]), bonobos (Pan paniscus) provide a powerful phylogenetic test of whether this trait is derived in humans...
January 3, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29305256/from-appetite-setpoint-to-appetition-50years-of-ingestive-behavior-research
#20
Anthony Sclafani
I review the main themes of my 50-year research career in ingestive behavior as a graduate student at the University of Chicago and a professor at the City University of New York. A seminar course with my Ph.D. mentor, S. P. Grossman, sparked my interest in the hypothalamic obesity syndrome. I developed a wire knife to dissect the neuropathways and the functional disorder responsible for the syndrome. An elevated appetite setpoint that permitted the overconsumption of palatable foods appeared central to the hypothalamic syndrome...
January 2, 2018: Physiology & Behavior
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