Publications by authors named "Jack Yanovski"

Nutritional epidemiology aims to link dietary exposures to chronic disease, but the instruments for evaluating dietary intake are inaccurate. One way to identify unreliable data and the sources of errors is to compare estimated intakes with the total energy expenditure (TEE). In this study, we used the International Atomic Energy Agency Doubly Labeled Water Database to derive a predictive equation for TEE using 6,497 measures of TEE in individuals aged 4 to 96 years.

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Background: Identifying and treating metabolic syndrome (MetS) early is of great importance, as MetS portends numerous negative health outcomes. Identifying an inexpensive, readily available inflammatory biomarker that accurately predicts MetS could be of use to clinicians.

Methods: The aim of this study was to evaluate the relationship between the neutrophil-to-lymphocyte ratio (NLR) and MetS in U.

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Objectives: We investigated whether empirically derived childhood obesity phenotypes were differentially associated with risk of hypertension in young adulthood, and whether these associations differed by sex.

Methods: Data came from 11,404 participants in the Growing Up Today Study, a prospective cohort study in the US established in 1996. We used a childhood obesity phenotype variable that was previously empirically derived using latent class analysis.

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Article Synopsis
  • The study investigates how children's perceptions of their social and socioeconomic status (subjective status) affect feelings of fullness (satiation) and hunger (satiety) after eating.
  • It found that children with lower subjective social status (SSS) feel less satiated after eating and report higher hunger levels over the next 90 minutes.
  • The findings suggest that experiencing low subjective status might dull feelings of fullness, potentially leading to overeating and higher body mass in children and adolescents.
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Background/objectives: Attention bias (AB) toward food is associated with obesity, but it is unclear if programs designed to reduce AB can impact adolescents' eating behavior. We investigated whether a two-week, smartphone-delivered attention retraining (AR) program (vs a control program) altered food AB in adolescent girls with overweight.

Methods: Participants completed three food-cue visual-probe trainings/day.

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Introduction: Loss-of-control (LOC) eating, or the subjective experience of being unable to stop eating, is a hallmark feature of binge-eating episodes, which are also characterized by consuming an unusually large amount of food. However, regardless of the size of eating episode, LOC-eating may be a risk factor for adverse health outcomes. This systematic review and meta-analysis comprehensively examine the relationship of LOC-eating with cardiometabolic health components and inflammatory markers.

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Background: Up to 50% of adolescents who undergo metabolic and bariatric surgery (MBS) have obesity 3 years post-MBS, placing them at continued risk for the consequences of obesity.

Objectives: We conducted an open-label, 16-week pilot study of liraglutide in adolescents with obesity after sleeve gastrectomy (SG) to investigate liraglutide effects on weight and body mass index (BMI) post-SG.

Methods: Adolescents aged 12-20.

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  • Smith Magenis Syndrome (SMS) is a rare genetic disorder linked to obesity, possibly due to issues with the MC4R pathway; this study tested the MC4R agonist setmelanotide for its effects on obesity, hunger, and safety in SMS patients.* -
  • Twelve individuals aged 11-39 participated, with only 10 completing a 3-month treatment of setmelanotide. Results showed a negligible change in body weight, but a significant reduction in self-reported hunger and a decrease in total cholesterol levels.* -
  • The study concluded that setmelanotide didn't significantly aid weight loss in SMS patients, and while hunger decreased, the findings regarding lipid changes and MC4R pathway
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  • Prader-Willi syndrome (PWS) is a rare genetic disorder linked to the absence of certain genes on chromosome 15, leading to symptoms like low muscle tone, cognitive issues, and a constant urge to eat, which can cause severe obesity if not managed.
  • The study assessed the long-term effectiveness of Diazoxide choline extended-release (DCCR) tablets on managing hyperphagia and other behavioral issues in PWS patients through comparisons between a treatment cohort and a natural history study cohort.
  • Results showed that those treated with DCCR exhibited significant reductions in hyperphagia scores and improvements in behavioral assessments over 26 and 52 weeks, with findings remaining consistent even under worst-case data scenarios. *
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Background And Objectives: Resting energy expenditure (REE) assessments can help inform clinical treatment decisions in adolescents with elevated body mass index (BMI), but current equations are suboptimal for severe obesity. We developed a predictive REE equation for youth with severe obesity and obesity-related comorbidities and compared results to previously published predictive equations.

Methods: Data from indirect calorimetry, clinical measures, and body composition per Dual x-ray absorptiometry (DXA) were collected from five sites.

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  • Dieting might make people feel like they can't control their eating, but this study found that it might not be true for kids and teens.
  • The researchers let kids eat as much as they wanted and looked at how much they ate while checking if they were on a diet.
  • They found that only a few kids were dieting, and it didn’t change how much they ate, so more experiments are needed to understand this better.
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Objectives: Low social standing and teasing are independently associated with increased body mass index (BMI) and overeating in children. However, children with low social status may be vulnerable to teasing.

Methods: We tested the statistical interaction of subjective social status (SSS) and subjective socioeconomic status (SSES) and teasing distress on BMI, fat mass index (FMI), and eating in the absence of hunger (EAH) in children (Mage = 13.

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Objective: Adolescent children of US service members (i.e., military-dependent youth) face unique stressors that increase risk for various forms of disinhibited eating, including emotional eating.

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Objectives: We investigated whether empirically derived childhood obesity phenotypes were differentially associated with risk of hypertension in young adulthood, and whether these associations differed by sex.

Methods: Data came from 11,404 participants in the Growing Up Today Study, a prospective cohort study in the US established in 1996. We used a childhood obesity phenotype variable that was previously empirically derived using latent class analysis.

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Importance: More than 40% of US adults have obesity, which increases the risks for multiple chronic diseases and premature mortality. Historically, nonsurgical interventions often have not led to sufficient weight loss and maintenance to improve health, but highly effective antiobesity medications (AOMs) have recently become available, and additional effective therapeutics are under development. Given that most medical care for adults with obesity is delivered in primary care settings, guidance for integrating weight-management approaches is needed.

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A distinct adipose tissue distribution pattern was observed in patients with methylmalonyl-CoA mutase deficiency, an inborn error of branched-chain amino acid (BCAA) metabolism, characterized by centripetal obesity with proximal upper and lower extremity fat deposition and paucity of visceral fat, that resembles familial multiple lipomatosis syndrome. To explore brown and white fat physiology in methylmalonic acidemia (MMA), body composition, adipokines, and inflammatory markers were assessed in 46 patients with MMA and 99 matched controls. Fibroblast growth factor 21 levels were associated with acyl-CoA accretion, aberrant methylmalonylation in adipose tissue, and an attenuated inflammatory cytokine profile.

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Article Synopsis
  • * It compares outcomes of a group receiving IPT to those in a health education program, analyzing data from 113 girls aged 12-17 over a year.
  • * Results show that stronger emotional bonds in IPT led to less weight gain and fewer LOC eating episodes, while task collaboration was associated with weight gain in both groups, suggesting the need for more research on these relationships.
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Objective: This prospective cohort study aimed to empirically derive phenotypes of children and adolescents with overweight and obesity.

Methods: Latent class analyses using Mplus were carried out in the Growing Up Today Study. Information on participants' weight status, disordered eating behaviors, body image and weight concerns, depressive symptoms, and pubertal timing, as well as and maternal weight status, were included in the latent class analyses, which were stratified by sex.

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Introduction: Loss-of-control (LOC) eating, a key feature of binge-eating disorder, may relate attentional bias (AB) to highly salient interpersonal stimuli. The current pilot study used magnetoencephalography (MEG) to explore neural features of AB to socially threatening cues in adolescent girls with and without LOC-eating.

Methods: Girls (12-17 years old) with overweight or obesity (BMI >85th percentile) completed an AB measure on an affective dot-probe AB task during MEG and evoked neural responses to angry or happy (vs.

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  • Subjective socioeconomic status (SSES) and objective socioeconomic status (OSES) independently influence children's body composition and eating behaviors, with low OSES limiting access to healthy foods and low SSES driving preference for high-energy foods.
  • A study analyzed data from the Children's Growth and Behavior Study to explore how SSES and OSES relate to children's BMI, fat mass index (FMI), and eating behaviors like hyperphagia.
  • Results showed that low SSES is linked to more severe hyperphagia, particularly in children from lower OSES households, highlighting the need for future research on how these socioeconomic factors interact to affect children's health.
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Objective: This study assessed the effect of 1-year administration of diazoxide choline extended-release tablet (DCCR) on hyperphagia and other complications of Prader-Willi syndrome (PWS).

Methods: The authors studied 125 participants with PWS, age ≥ 4 years, who were enrolled in the DESTINY PWS Phase 3 study and who received DCCR for up to 52 weeks in DESTINY PWS and/or its open-label extension. The primary efficacy endpoint was Hyperphagia Questionnaire for Clinical Trials (HQ-CT) score.

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Obesity-induced inflammation plays a substantial role in the development of insulin resistance and type 2 diabetes. The altered gut flora in obesity can also contribute to metabolic dysregulation and systemic inflammation. However, it remains unclear how dysregulation of systemic inflammation in obesity affects the gut microbiome.

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Rates of childhood overweight/obesity have risen for decades; however, data show the prevalence increased at a faster rate during the COVID-19 pandemic. Pandemic-associated increases in youth's body mass index (BMI; kg/m) have been attributed to decreases in reported physical activity; few studies have examined changes in food intake. We therefore examined changes in total energy, nutrient consumption, BMI, BMIz, and adiposity longitudinally over 3 years, comparing healthy youth aged 8-17 years assessed twice prior to the pandemic, to youth seen once before and once during the pandemic.

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  • A study evaluated 229 adult patients with chronic graft-versus-host disease (cGVHD) for the prevalence and impact of metabolic syndrome (MetS), finding that 54.1% met the diagnostic criteria for MetS.
  • Patients with higher body mass index and poorer performance status were more likely to have MetS, along with specific inflammatory and kidney function markers indicating its presence.
  • Despite the high prevalence of MetS, there were no significant differences in survival rates or cGVHD severity between patients with and without MetS, suggesting the need for proactive screening to prevent future complications.
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