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https://www.readbyqxmd.com/read/28108344/reward-sensitivity-and-body-weight-the-intervening-role-of-food-responsive-behavior-and-external-eating
#1
Laura Vandeweghe, Sandra Verbeken, Leentje Vervoort, Ellen Moens, Caroline Braet
BACKGROUND: During the last three decades, the prevalence of childhood overweight and obesity has increased worldwide. It is well established that different child-related factors such as food approach behaviors (i.e. eating behaviors that imply movements towards food) contribute to the development of overweight. However, research is lacking on the underlying mechanisms leading to food approach behaviors, which in turn lead to overweight. SUBJECT/METHODS: Via parent-report questionnaires, we investigated the relation between the personality trait reward sensitivity and body weight in a convenience sample of 211 children aged 2...
January 17, 2017: Appetite
https://www.readbyqxmd.com/read/28093902/making-sense-of-metabolic-obesity-and-hedonic-obesity
#2
REVIEW
Yu Yi-Hao
Body weight is neither stationary nor changing unidirectionally. It usually oscillates up and down around a set-point. Two types of forces determine the direction of weight changes. Forces that push body weight away from the set-point are defined as non-homeostatic and are governed by multiple mechanisms, including but not limited to hedonic regulation of food intake. Forces that restore the set-point weight are defined as homeostatic, and they operate through the mechanisms that regulate short-term energy balance driven by hunger and satiation and long-term energy balance driven by changes in adiposity...
January 17, 2017: Journal of Diabetes
https://www.readbyqxmd.com/read/28093305/role-of-leptin-in-conditioned-place-preference-to-high-fat-diet-in-leptin-deficient-ob-ob-mice
#3
Yoshiyuki Shimizu, Cheol Son, Daisuke Aotani, Hidenari Nomura, Takatoshi Hikida, Kiminori Hosoda, Kazuwa Nakao
Leptin is an adipocyte-derived anorexic hormone that exerts its effects via the hypothalamus and other brain regions, including the reward system. Leptin-deficient ob/ob mice that present morbid obesity, hyperphagia, insulin resistance, and infertility are one of the most investigated mouse models of obesity. Conditioned place preference (CPP) paradigm is a standard behavioral model to evaluate the rewarding value of substrates. While leptin is reported to decrease the CPP of lean mice for high fat diet (HFD), it is unknown how CPP toward HFD is affected by leptin replacement in the pathophysiological condition of ob/ob mice...
January 14, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28090039/interaction-between-the-rgs6-gene-and-psychosocial-stress-on-obesity-related-traits
#4
Hyun-Jin Kim, Jin-Young Min, Kyoung-Bok Min
Obesity is a major risk factor for chronic diseases and arises from the interactions between environmental factors and multiple genes. Psychosocial stress may affect the risk for obesity, modifying food intake and choice. A recent study suggested regulator of G-protein signaling 6 (RGS6) as a novel candidate gene for obesity in terms of reward-related feeding under stress. In this study, we tried to verify the unidentified connection between RGS6 and human obesity with psychosocial stress in a Korean population...
January 13, 2017: Endocrine Journal
https://www.readbyqxmd.com/read/28089706/a-sipometer-for-measuring-motivation-to-consume-and-reward-value-of-foods-and-beverages-in-humans-description-and-proof-of-principle
#5
P S Hogenkamp, A Shechter, M-P St-Onge, A Sclafani, H R Kissileff
New methods, derived from animal work, for measuring food reward value, i.e. reinforcing value of food, and motivation (i.e. strength of desire) to consume, in humans are described and validated. A sipping device (sipometer) was developed that permits access to a liquid food or beverage on two reward schedules: continuous reinforcement (CR) and progressively increasing time spent exerting pressure on a straw (PR-schedule). In addition, a pictorial scale showing a cup, from which the 'amount wanted' could be marked was used to pre-test potential consumption...
January 12, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28088703/dopaminergic-rules-of-engagement-for-memory-in-drosophila
#6
REVIEW
Karla R Kaun, Adrian Rothenfluh
Dopamine is associated with a variety of conserved responses across species including locomotion, sleep, food consumption, aggression, courtship, addiction and several forms of appetitive and aversive memory. Historically, dopamine has been most prominently associated with dynamics underlying reward, punishment, or salience. Recent emerging evidence from Drosophila supports a role in all of these functions, as well as additional roles in the interplay between external sensation and internal states and forgetting of the very memories dopamine helped encode...
January 12, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28088215/non-associative-versus-associative-learning-by-foraging-predatory-mites
#7
Peter Schausberger, Stefan Peneder
BACKGROUND: Learning processes can be broadly categorized into associative and non-associative. Associative learning occurs through the pairing of two previously unrelated stimuli, whereas non-associative learning occurs in response to a single stimulus. How these two principal processes compare in the same learning task and how they contribute to the overall behavioural changes brought about by experience is poorly understood. We tackled this issue by scrutinizing associative and non-associative learning of prey, Western flower thrips Frankliniella occidentalis, by the predatory mite, Neoseiulus californicus...
January 14, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28087369/multidimensional-assessment-of-impulsivity-in-relation-to-obesity-and-food-addiction
#8
Lauren VanderBroek-Stice, Monika K Stojek, Steven R H Beach, Michelle R vanDellen, James MacKillop
Based on similarities between overconsumption of food and addictive drugs, there is increasing interest in "food addiction," a compulsive eating pattern defined using symptoms parallel to substance use disorders. Impulsivity, a multidimensional construct robustly linked to drug addiction, has been increasingly examined as an obesity determinant, but with mixed findings. This study sought to clarify relations between three major domains of impulsivity (i.e., impulsive personality traits, discounting of delayed rewards, and behavioral inhibition) in both obesity and food addiction...
January 10, 2017: Appetite
https://www.readbyqxmd.com/read/28077308/cookie-or-fruit-relative-reinforcing-value-of-snack-foods-among-preschoolers-with-overweight-obesity-compared-to-healthy-weight
#9
Mary Beth McCullough, Hayley Guilkey, Lori Stark
The reinforcing value of food is an important determinant of food intake. Research has yet to examine the relative reinforcing value (RRV) of snack foods in young children with overweight and obesity (OW/OB). The current study compared the RRV of high-energy dense foods (cookies) to low-energy dense foods (fruits) between preschoolers with OW/OB and healthy weight (HW). RRV of cookies and fruits in preschoolers with OW/OB (n = 30; Mage = 4.4 ± 0.84; 60% male) and HW (n = 30; Mage = 4.5 ± 0.85; 70% male) was assessed with a developmentally-tailored computer program which used a progressive fixed ratio reward schedule...
January 8, 2017: Appetite
https://www.readbyqxmd.com/read/28075492/a-thematic-content-analysis-of-cheatmeal-images-on-social-media-characterizing-an-emerging-dietary-trend
#10
Eva Pila, Jonathan M Mond, Scott Griffiths, Deborah Mitchison, Stuart B Murray
Despite the pervasive social endorsement of "cheat meals" within pro-muscularity online communities, there is an absence of empirical work examining this dietary phenomenon. The present study aimed to characterize cheat meals, and explore the meaning ascribed to engagement in this practice. Thematic content analysis was employed to code the photographic and textual elements of a sample (n = 600) that was extracted from over 1.6 million images marked with the #cheatmeal tag on the social networking site, Instagram...
January 11, 2017: International Journal of Eating Disorders
https://www.readbyqxmd.com/read/28062254/the-effects-of-d-govadine-on-conditioned-place-preference-with-d-amphetamine-or-food-reward
#11
Maya O Nesbit, Carine Dias, Anthony G Phillips
Tetrahydroprotoberberines (THPB) have a high affinity for dopamine (DA) D1 and D2 receptors and may provide a novel treatment for drug addiction. We assessed the effects of the THPB d-govadine on the acquisition, expression, extinction and reinstatement of d-amphetamine-(1.5mg/kg, i.p.) induced conditioned place preference (CPP). Furthermore, the effects of d-govadine on conditioned association between contextual stimuli and a natural reward were examined using food-induced CPP. In separate experiments, rats received d-govadine (0, 0...
January 3, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28057530/effects-of-nucleus-accumbens-amphetamine-administration-on-performance-in-a-delay-discounting-task
#12
Caitlin A Orsini, Marci R Mitchell, Sara C Heshmati, Kristy G Shimp, Megan S Spurrell, Jennifer L Bizon, Barry Setlow
Chronic administration of cocaine can cause pronounced and enduring cognitive alterations such as increases in impulsive choice. Chronic cocaine can also result in enhanced dopamine (DA) release in the nucleus accumbens (NAc) in response to reward-related cues. It is possible that this enhanced DA release in the NAc is a mechanism by which cocaine increases impulsive choice. To date, however, the specific role of DA in the NAc in impulsive choice is unclear. To begin to address this, rats received acute microinjections of the indirect DA agonist amphetamine directly into the NAc prior to testing in a delay discounting task in which rats chose between a small, immediate and a large, delayed food reward...
January 3, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28054426/relation-between-cognitive-and-hedonic-responses-to-a-meal
#13
B Ciccantelli, T Pribic, C Malagelada, A Accarino, F Azpiroz
BACKGROUND: Ingestion of a meal induces cognitive and hedonic sensations and our aim was to determine the relation between both dimensions. METHODS: In three groups of healthy non-obese men (n=10 per group) three types of meals with equivalent levels of palatability were tested: a liquid meal, a solid-liquid low-calorie meal, and a solid-liquid high-calorie meal. The cognitive and hedonic responses were measured on 10-cm scales before and during the 30-minute postprandial period...
January 5, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28054099/feeding-modulatory-effects-of-mu-opioids-in-the-medial-prefrontal-cortex-a-review-of-recent-findings-and-comparison-to-opioid-actions-in-the-nucleus-accumbens
#14
REVIEW
Ryan A Selleck, Brian A Baldo
RATIONALE: Whereas reward-modulatory opioid actions have been intensively studied in subcortical sites such as the nucleus accumbens (Acb), the role of cortical opioid transmission has received comparatively little attention. OBJECTIVES: The objective of this study is to describe recent findings on the motivational actions of opioids in the prefrontal cortex (PFC), emphasizing studies of food motivation and ingestion. PFC-based opioid effects will be compared/contrasted to those elicited from the Acb, to glean possible common functional principles...
January 4, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28046201/measuring-cognitive-judgement-bias-in-rats-using-the-ambiguous-cue-interpretation-test
#15
Justyna Papciak, Rafal Rygula
An active-choice, operant, ambiguous-cue interpretation (ACI) paradigm is described that can be used for measuring cognitive judgement bias in rats. In this behavioral test, animals in an operant conditioning chamber are trained to press a lever to receive a food reward when a specific tone is presented, and to press another lever in response to a different tone to avoid punishment by an electric foot-shock. The tones, which serve as discriminative stimuli, acquire a positive or negative valence, and the training continues until the rats demonstrate a stable, correct discrimination between these two stimuli...
January 3, 2017: Current Protocols in Neuroscience
https://www.readbyqxmd.com/read/28045460/neural-substrates-of-cue-reactivity-and-craving-in-gambling-disorder
#16
E H Limbrick-Oldfield, I Mick, R E Cocks, J McGonigle, S P Sharman, A P Goldstone, P R A Stokes, A Waldman, D Erritzoe, H Bowden-Jones, D Nutt, A Lingford-Hughes, L Clark
Cue reactivity is an established procedure in addictions research for examining the subjective experience and neural basis of craving. This experiment sought to quantify cue-related brain responses in gambling disorder using personally tailored cues in conjunction with subjective craving, as well as a comparison with appetitive non-gambling stimuli. Participants with gambling disorder (n=19) attending treatment and 19 controls viewed personally tailored blocks of gambling-related cues, as well as neutral cues and highly appetitive (food) images during a functional magnetic resonance imaging (fMRI) scan performed ~2-3 h after a usual meal...
January 3, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28044061/in-silico-identification-and-in-vivo-validation-of-mir-495-as-a-novel-regulator-of-motivation-for-cocaine-that-targets-multiple-addiction-related-networks-in-the-nucleus-accumbens
#17
R M Bastle, R J Oliver, A S Gardiner, N S Pentkowski, F Bolognani, A M Allan, T Chaudhury, M St Peter, N Galles, C Smith, J L Neisewander, N I Perrone-Bizzozero
MicroRNAs (miRNAs) are important post-transcriptional regulators of gene expression and are implicated in the etiology of several neuropsychiatric disorders, including substance use disorders (SUDs). Using in silico genome-wide sequence analyses, we identified miR-495 as a miRNA whose predicted targets are significantly enriched in the Knowledgebase for Addiction Related Genes (ARG) database (KARG; http://karg.cbi.pku.edu.cn). This small non-coding RNA is also highly expressed within the nucleus accumbens (NAc), a pivotal brain region underlying reward and motivation...
January 3, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28042870/obesity-induced-structural-and-neuronal-plasticity-in-the-lateral-orbitofrontal-cortex
#18
Jennifer L Thompson, Michael Drysdale, Corey Baimel, Manpreet Kaur, Taigan MacGowan, Kimberley A Pitman, Stephanie L Borgland
The orbitofrontal cortex (OFC) integrates sensory information with the current value of foods and updates actions based on this information. Obese humans and rats fed a cafeteria diet have impaired devaluation of food rewards, implicating a potential obesity-induced dysfunction of the OFC. We hypothesized that obesity alters OFC pyramidal neuronal structure and function and reduces conditioned suppression of feeding. Rats were given restricted (1 h/day), extended (23 h/day) or no (chow only) access to a cafeteria diet and tested for a conditioned suppression of feeding...
January 18, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28042038/exposure-to-food-cues-moderates-the-indirect-effect-of-reward-sensitivity-and-external-eating-via-implicit-eating-expectancies
#19
Aimee L Maxwell, Natalie J Loxton, Julie M Hennegan
Previous research has suggested that the expectancy "eating is rewarding" is one pathway driving the relationship between trait reward sensitivity and externally-driven eating. The aim of the current study was to extend previous research by examining the conditions under which the indirect effect of reward sensitivity and external eating via this eating expectancy occurs. Using a conditional indirect effects approach we tested the moderating effect of exposure to food cues (e.g., images) relative to non-food cues on the association between reward sensitivity and external eating, via eating expectancies...
December 29, 2016: Appetite
https://www.readbyqxmd.com/read/28035259/repeatability-of-individual-migration-routes-wintering-sites-and-timing-in-a-long-distance-migrant-bird
#20
Rien E van Wijk, Silke Bauer, Michael Schaub
Migratory birds are often faithful to wintering (nonbreeding) sites, and also migration timing is usually remarkably consistent, that is, highly repeatable. Spatiotemporal repeatability can be of advantage for multiple reasons, including familiarity with local resources and predators as well as avoiding the costs of finding a new place, for example, nesting grounds. However, when the environment is variable in space and time, variable site selection and timing might be more rewarding. To date, studies on spatial and temporal repeatability in short-lived long-distance migrants are scarce, most notably of first-time and subsequent migrations...
December 2016: Ecology and Evolution
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