Publications by authors named "Tarkan Karakan"

Introduction: Obesity is considered not only a public health issue on a global scale but also a disease adversely affecting the world economies. Economic impact of overweight and obesity has not yet been investigated in Türkiye at a national level. This study aimed to investigate the impact of obesity on the healthcare costs in Türkiye and to estimate the overall national economic burden of obesity.

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Background And Aims: Intermittent fasting is a nutritional strategy that focuses on when to eat, rather than what to eat. Although the effectiveness of intermittent fasting practices in many metabolic diseases is known, its effect on microbiota and its underlying mechanism has not yet been clarified. This study aimed to investigate the effect of Ramadan fasting, one of the intermittent fasting practices, on gut microbiota and fatty acid binding protein 4 (FABP4).

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Background/aims:  Gastroenterologists have an important role in the treatment and management of comorbidities related to obesity. Assessment of gastroenterologists' perception and attitude toward obesity was aimed in this study.

Materials And Methods:  Survey questions were determined for the study.

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Background And Aim: The histological diagnosis of autoimmune hepatitis (AIH) is challenging. A new consensus recommendation was provided by the International AIH Pathology Group to address the problems in the histological diagnosis. The purpose of this study is to compare the 2008 'simplified' criteria for AIH with the 'consensus recommendation' of 2022 in terms of diagnostic sensitivity.

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Parathyroid hormone (PTH) interacts with components of the gut microbiota to exert its bone-regulating effects. This study aimed to investigate the gut microbial composition in patients with primary hyperparathyroidism (PHPT). Nine patients with PHPT and nine age-sex and body mass index-matched healthy controls were included.

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Objectives: Probiotics have been gaining increased attention from the public recently, which originates concerns about their rationale use among healthcare professionals. Although there is evidence on the efficacy and safety of probiotics in certain gastrointestinal disorders, it is important to identify healthcare professionals' opinions on probiotics. This study aimed to identify the opinions of pharmacists and physicians on the use of probiotics.

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Article Synopsis
  • The study aimed to evaluate the effectiveness of early medical prophylaxis versus waiting for endoscopy findings in preventing postoperative recurrence (POR) in patients with Crohn's disease after ileocaecal resection (ICR).
  • Out of 346 patients, those receiving early prophylactic treatment (Cohort 1) had significantly lower endoscopic recurrence rates compared to those who only received treatment based on endoscopy results (Cohort 2).
  • While both groups did not show significant differences in severe endoscopic POR or time to surgical recurrence, the proactive group had a lower treatment burden when using immunomodulators.
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Nonalcoholic fatty liver disease (NAFLD) is a multisystem disease and is significantly associated with obesity, insulin resistance, type 2 diabetes mellitus, metabolic syndrome, and cardiovascular disease. NAFLD has become the most prevalent chronic liver disease in Western countries, and the proportion of NAFLD-related cirrhosis among patients on liver transplantation waiting lists has increased. In light of the accumulated data about NAFLD, and to provide a common approach with multi-disciplines dealing with the subject, it has become necessary to create new guidance for diagnosing and treating NAFLD.

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Background And Aims: Currently malignancies of the liver are the sixth most frequently diagnosed cancers worldwide. The admission of patients to hospitals decreased due to the restriction of the Coronavirus disease 2019 (COVİD-19) pandemic, especially patients suspected with cancer were delayed in their diagnosis and treatment. With this study, we aimed to investigate whether the Covid-19 pandemic caused a decrease in the number of hepatocellular cancers (HCC) or a delay in its diagnosis.

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We enrolled consecutive IBS-M patients (n = 25) according to Rome IV criteria. Fecal samples were obtained from all patients twice (pre-and post-intervention) and high-throughput 16S rRNA sequencing was performed. Six weeks of personalized nutrition diet (n = 14) for group 1 and a standard IBS diet (n = 11) for group 2 were followed.

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Background: The World Health Organization (WHO) proposed an updated reporting system for pancreaticobiliary cytology, which moves low-grade malignancies to "positive for malignancy" group and serous cystadenoma to "negative for malignancy" group. The WHO system also created two new categories, namely, pancreatic neoplasia-low grade (PaN-Low) and pancreatic neoplasia-high grade (PaN-High), which includes neoplastic mucinous cysts and stratifies them according to their cytologic atypia. The risk of malignancy (ROM) of the new categories of the WHO system needs to be defined.

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Circadian rhythm disturbances induced by rotating shift work contribute to development of metabolic disorders. However, their effects on intestinal parameters such as epithelial permeability and fecal short chain fatty acid (SCFA) levels have not been established yet. This study was planned to investigate the changes in intestinal integrity, fecal SCFA levels, gut microbiota and nutritional intake of rotational shift workers.

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Background: Consistent guidance for choosing an appropriate probiotic for the treatment of irritable bowel syndrome is lacking.

Methods: Literature databases searched included: PubMed, Google Scholar and NIH registry of clinical trials from inception to June 2021. Inclusion criteria: randomized controlled trials (RCTs) enrolling adult or pediatric IBS patients comparing probiotics against controls and ≥ 2 RCTs with common IBS outcome measures within each type of probiotic.

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Although medium and high doses of lactulose are used routinely for the treatment of constipation and hepatic encephalopathy, respectively, a wealth of evidence demonstrates that, at low doses, lactulose can also be used as a prebiotic to stimulate the growth of health-promoting bacteria in the gastrointestinal tract. Indeed, multiple preclinical and clinical studies have shown that low doses of lactulose enhance the proliferation of health-promoting gut bacteria (e.g.

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Gut microbiota composition and function are major areas of research for functional gastrointestinal disorders. There is a connection between gastrointestinal tract and central nervous system and this is mediated by neurotransmitters, inflammatory cytokines, the vagus nerve and the hypothalamic-pituitary-adrenal axis. Functional gastrointestinal disorders are prevalent diseases affecting more than one third of the population.

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Behçet's Syndrome (BS) is a multisystem vasculitis with various clinical manifestations. Pathogenesis is unclear, but studies have shown genetic factors, innate immunity and autoinflammation to have an important role in the disease course. Diversity in the microbial community of gut microbiota may significantly contribute to the activation of the innate immune system.

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Article Synopsis
  • Functional dyspepsia (FD) is a common gastrointestinal disorder that significantly affects patients' quality of life and is challenging to treat.
  • A study tested the efficacy and safety of trimebutine maleate (TM) compared to a placebo over 4 weeks with 211 patients participating, revealing a significant improvement in symptoms for those taking TM.
  • The results also indicated that TM accelerated gastric emptying and had manageable side effects, suggesting it could be a beneficial treatment for FD but needing further investigation.
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Day and night cycles are the most important cue for the central clock of human beings, and they are also important for the gut clock. The aim of the study is to determine the differences in the gut microbiota of rotational shift workers when working the day versus night shift. Fecal samples and other data were collected from 10 volunteer male security officers after 4 weeks of day shift work (07:00-15:00 h) and also after 2 weeks of night shift work (23:00-07:00 h).

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Background/aims: It has been largely accepted that dietary habits affect intestinal microbiota composition. In this pilot study, we hypothesized that time-restricted feeding, which can be regarded as a type of intermittent fasting, may have a distinct effect on intestinal microbiota. Ramadan fasting is an excellent model to understand how time-restricted feeding affect the microbiota.

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Background/aims: Pancreatic steatosis (PS) is a generally used term to define accumulation of fat in the pancreas. In theory PS may be able to affect the exocrine function of pancreas. In this study we aimed to determine the effect of PS on exocrine pancreas function.

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Microbiota is a dynamic system showing individual differences in both the number and species of microorganisms. Dietary habits, lifestyle, age, genetic predisposition of the host and use of antibiotics are effective on microbiota. The aim of our research was to carry out a quantitative comparison of Bifidobacterium spp, Bacteroides fragilis, Lactobacillus spp, Akkermansia mucinophilia and Faecalibacterium prausnitzii, important bacterial microbiota species, before and after antibiotic therapy treated with tetracycline and metronidazole in patients who are diagnosed as positive for Helicobacter pylori (HP), and to determine the effects of antibiotic use on the microbiota.

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