Robustness of radiomics among photon-counting detector CT and dual-energy CT systems: a texture phantom study.

OBJECTIVES: To evaluate the robustness of radiomics features among photon-counting detector CT (PCD-CT) and dual-energy CT (DECT) systems. METHODS: A texture phantom consisting of twenty-eight materials was scanned with one PCD-CT and four DECT systems (dual-source, rapid kV-switching, dual-layer, and sequential scanning) at three dose levels twice. Thirty sets of virtual monochromatic images at 70 keV were reconstructed. Regions of interest were delineated for each material with a rigid registration. Ninety-three radiomics were extracted per PyRadiomics. The test-retest repeatability between repeated scans was assessed by Bland-Altman analysis. The intra-system reproducibility between dose levels, and inter-system reproducibility within the same dose level, were evaluated by intraclass correlation coefficient (ICC) and concordance correlation coefficient (CCC). Inter-system variability among five scanners was assessed by coefficient of variation (CV) and quartile coefficient of dispersion (QCD). RESULTS: The test-retest repeatability analysis presented that 97.1% of features were repeatable between scan-rescans. The mean ± standard deviation ICC and CCC were 0.945 ± 0.079 and 0.945 ± 0.079 for intra-system reproducibility, respectively, and 86.0% and 85.7% of features were with ICC > 0.90 and CCC > 0.90, respectively, between different dose levels. The mean ± standard deviation ICC and CCC were 0.157 ± 0.174 and 0.157 ± 0.174 for inter-system reproducibility, respectively, and none of the features were with ICC > 0.90 or CCC > 0.90 within the same dose level. The inter-system variability suggested that 6.5% and 12.8% of features were with CV < 10% and QCD < 10%, respectively, among five CT systems. CONCLUSION: The radiomics features were non-reproducible with significant variability in values among different CT techniques. CLINICAL RELEVANCE STATEMENT: Radiomics features are non-reproducible with significant variability in values among photon-counting detector CT and dual-energy CT systems, necessitating careful attention to improve the cross-system generalizability of radiomic features before implementation of radiomics analysis in clinical routine. KEY POINTS: CT radiomics stability should be guaranteed before the implementation in the clinical routine. Radiomics robustness was on a low level among photon-counting detectors and dual-energy CT techniques. Limited inter-system robustness of radiomic features may impact the generalizability of models.

The association of sexual minority status and bullying victimization is modified by sex and grade: findings from a nationally representative sample.

BACKGROUND: Sexual minority status is associated with face-to-face bullying and cyberbullying victimization. However, limited studies have investigated whether such a relationship differs by sex or grade in a nationally representative sample. METHODS: We concatenated the national high school data from the Youth Risk Behavior Surveillance System (YRBSS) chronologically from 2015 to 2019, resulting in a sample of 32,542 high school students. We constructed models with the interaction term between sexual minority status and biological sex assigned at birth to test the effect modification by sex on both the multiplicative and additive scales. A similar method was used to test the effect modification by grade. RESULTS: Among heterosexual students, females had a higher odds of being bullied than males, while among sexual minority students, males had a higher odds of being bullied. The effect modification by sex was significant on both the multiplicative and additive scales. We also found a decreasing trend of bullying victimization as the grade increased among both heterosexual and sexual minority students. The effect modification by the grade was significant on both the multiplicative and the additive scale. CONCLUSIONS: Teachers and public health workers should consider the difference in sex and grade when designing prevention programs to help sexual minority students.

[Mass transfer of bilirubin and bovine serum albumin in hollow fiber membrane module of artificial liver].

Understanding the mass transfer behaviors in hollow fiber membrane module of artificial liver is important for improving toxin removal efficiency. A three-dimensional numerical model was established to study the mass transfer of small molecule bilirubin and macromolecule bovine serum albumin (BSA) in the hollow fiber membrane module. Effects of tube-side flow rate, shell-side flow rate, and hollow fiber length on the mass transfer of bilirubin and BSA were discussed. The simulation results showed that the clearance of bilirubin was significantly affected by both convective and diffusive solute transport, while the clearance of macromolecule BSA was dominated by convective solute transport. The clearance rates of bilirubin and BSA increasd with the increase of tube-side flow rate and hollow fiber length. With the increase of shell-side flow rate, the clearance rate of bilirubin first rose rapidly, then slowly rose to an asymptotic value, while the clearance rate of BSA gradually decreased. The results can provide help for designing structures of hollow fiber membrane module and operation parameters of clinical treatment.

The endorsement of general and artificial intelligence reporting guidelines in radiological journals: a meta-research study.

BACKGROUND: Complete reporting is essential for clinical research. However, the endorsement of reporting guidelines in radiological journals is still unclear. Further, as a field extensively utilizing artificial intelligence (AI), the adoption of both general and AI reporting guidelines would be necessary for enhancing quality and transparency of radiological research. This study aims to investigate the endorsement of general reporting guidelines and those for AI applications in medical imaging in radiological journals, and explore associated journal characteristic variables. METHODS: This meta-research study screened journals from the Radiology, Nuclear Medicine & Medical Imaging category, Science Citation Index Expanded of the 2022 Journal Citation Reports, and excluded journals not publishing original research, in non-English languages, and instructions for authors unavailable. The endorsement of fifteen general reporting guidelines and ten AI reporting guidelines was rated using a five-level tool: "active strong", "active weak", "passive moderate", "passive weak", and "none". The association between endorsement and journal characteristic variables was evaluated by logistic regression analysis. RESULTS: We included 117 journals. The top-five endorsed reporting guidelines were CONSORT (Consolidated Standards of Reporting Trials, 58.1%, 68/117), PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses, 54.7%, 64/117), STROBE (STrengthening the Reporting of Observational Studies in Epidemiology, 51.3%, 60/117), STARD (Standards for Reporting of Diagnostic Accuracy, 50.4%, 59/117), and ARRIVE (Animal Research Reporting of In Vivo Experiments, 35.9%, 42/117). The most implemented AI reporting guideline was CLAIM (Checklist for Artificial Intelligence in Medical Imaging, 1.7%, 2/117), while other nine AI reporting guidelines were not mentioned. The Journal Impact Factor quartile and publisher were associated with endorsement of reporting guidelines in radiological journals. CONCLUSIONS: The general reporting guideline endorsement was suboptimal in radiological journals. The implementation of reporting guidelines for AI applications in medical imaging was extremely low. Their adoption should be strengthened to facilitate quality and transparency of radiological study reporting.

The descriptive analysis of depressive symptoms and White Blood Cell (WBC) count between the sexual minorities and heterosexual identifying individuals in a nationally representative sample: 2005-2014.

BACKGROUND: Sexual minorities are at a higher risk of suffering from depressive symptoms compared with heterosexual individuals. Only a few studies have examined the conditions of having depressive symptoms within different sexual minority groups, especially people with sexual orientation uncertainty in a nationally representative sample. Furthermore, few studies have explored whether the mean white blood count (WBC) is different between people with and without depressive symptoms among different sexual minority groups in a nationally representative sample. METHODS: We analyzed the National Health and Nutrition Examination Survey (NHANES) data from 2005 to 2014 with a sample of 14,090 subjects. We compared the prevalence of depressive symptoms in subpopulations stratified by sex, sexual minority status, and race. We also examined the difference in mean WBC count between depressed and non-depressed people among heterosexual individuals and different sexual minority groups. Additionally, two multivariable logistic regression models were used to explore the association between sexual minority status and depressive symptoms, treating sexual minority status as both a binary and categorical variable. RESULTS: Female sex (OR: 1.96, 95% CI: 1.72-2.22) and sexual minority status (OR: 1.79, 95% CI: 1.47-2.17) were both independently associated with depressive symptoms. Within the sexual minority population, subjects who were unsure about their sexual identities had the highest odds of having depressive symptoms (OR: 2.56, 95% CI: 1.40-4.68). In the subgroup analysis considering intersectionality, black sexual minority females had the highest rate of depressive symptoms (19.4%, 95% CI: 7.72-40.98). Finally, the mean WBC count differed significantly between people with and without depressive symptoms among male heterosexual individuals, female heterosexual individuals, and female sexual minorities, but not among male sexual minorities. CONCLUSIONS: Based on sex, race, and sexual minority status, black females of sexual minority status had the highest rate of depressive symptoms. Within sexual minority groups, participants who were unsure about their sexual identities had the highest odds of having depressive symptoms. Finally, the mean WBC count was significantly higher among people with depressive symptoms than those without depressive symptoms only among male heterosexuals, female heterosexuals, and female sexual minorities, but not among male sexual minorities. Future research should investigate the social and biological mechanisms of the differences.

Survey on human milk feeding and enteral feeding practices for very-low-birth-weight infants in NICUs in China Neonatal Network.

BACKGROUND: The breastfeeding rate in China is lower than that in many other countries and the extent of adoption of the "Feeding Recommendations for Preterm Infants and Low Birth Weight Infants" guideline in NICUs remains unclear. METHOD: A web-based survey about the current status of human milk feeding and enteral feeding practices at NICUs was sent to all China Neonatal Network's cooperation units on September 7, 2021, and the respondents were given a month to send their responses. RESULTS: All sixty NICUs responded to the survey, the reply rate was 100%. All units encouraged breastfeeding and provided regular breastfeeding education. Thirty-six units (60.0%) had a dedicated breastfeeding/pumping room, 55 (91.7%) provided kangaroo care, 20 (33.3%) had family rooms, and 33 (55.0%) routinely provided family integrated care. Twenty hospitals (33.3%) had their own human milk banks, and only 13 (21.7%) used donor human milk. Eight units (13.3%) did not have written standard nutrition management guidelines for infants with body weight < 1500 g. Most units initiated minimal enteral nutrition with mother's milk for infants with birth weight ˂1500 g within 24 h after birth. Fifty NICUs (83.3%) increased the volume of enteral feeding at 10-20 ml/kg daily. Thirty-one NICUs (51.7%) assessed gastric residual content before every feeding session. Forty-one NICUs (68.3%) did not change the course of enteral nutrition management during drug treatment for patent ductus arteriosus, and 29 NICUs (48.3%) instated NPO for 1 or 2 feeds during blood transfusion. CONCLUSION: There were significant differences in human milk feeding and enteral feeding strategies between the NICUs in CHNN, but also similarities. The data obtained would be useful in the establishment of national enteral feeding guidelines for preterm infants and quality improvement of cooperation at the national level.

Implications of Spectral Interlacing for Quantum Graphs.

Quantum graphs are ideally suited to studying the spectral statistics of chaotic systems. Depending on the boundary conditions at the vertices, there are Neumann and Dirichlet graphs. The latter ones correspond to totally disassembled graphs with a spectrum being the superposition of the spectra of the individual bonds. According to the interlacing theorem, Neumann and Dirichlet eigenvalues on average alternate as a function of the wave number, with the consequence that the Neumann spectral statistics deviate from random matrix predictions. There is, e.g., a strict upper bound for the spacing of neighboring Neumann eigenvalues given by the number of bonds (in units of the mean level spacing). Here, we present analytic expressions for level spacing distribution and number variance for ensemble averaged spectra of Dirichlet graphs in dependence of the bond number, and compare them with numerical results. For a number of small Neumann graphs, numerical results for the same quantities are shown, and their deviations from random matrix predictions are discussed.

Rho/SMAD/mTOR triple inhibition enables long-term expansion of human neonatal tracheal aspirate-derived airway basal cell-like cells.

BACKGROUND: Bronchopulmonary dysplasia remains one of the most common complications of prematurity, despite significant improvements in perinatal care. Functional modeling of human lung development and disease, like BPD, is limited by our ability to access the lung and to maintain relevant progenitor cell populations in culture. METHODS: We supplemented Rho/SMAD signaling inhibition with mTOR inhibition to generate epithelial basal cell-like cell lines from tracheal aspirates of neonates. RESULTS: Single-cell RNA-sequencing confirmed the presence of epithelial cells in tracheal aspirates obtained from intubated neonates. Using Rho/SMAD/mTOR triple signaling inhibition, neonatal tracheal aspirate-derived (nTAD) basal cell-like cells can be expanded long term and retain the ability to differentiate into pseudostratified airway epithelium. CONCLUSIONS: Our data demonstrate that neonatal tracheal aspirate-derived epithelial cells can provide a novel ex vivo human cellular model to study neonatal lung development and disease. IMPACT: Airway epithelial basal cell-like cell lines were derived from human neonatal tracheal aspirates. mTOR inhibition significantly extends in vitro proliferation of neonatal tracheal aspirate-derived basal cell-like cells (nTAD BCCs). nTAD BCCs can be differentiated into functional airway epithelium. nTAD BCCs provide a novel model to investigate perinatal lung development and diseases.

Expression of long non-coding RNA LUCAT1 in patients with chronic obstructive pulmonary disease and its potential functions in regulating cigarette smoke extract-induced 16HBE cell proliferation and apoptosis.

BACKGROUND: Chronic obstructive pulmonary disease (COPD), characterized by persistent airflow limitation, was a disease mediated by a combination of inflammatory factors, immune cells, and immune mediators. COPD was an inflammatory and autoimmune disease involving T-lymphocytes triggered by cigarette smoke and other factors that progressively affected the bronchi, lung parenchyma, and pulmonary blood vessels. LncRNAs were reported to be implicated in COPD pathogenesis and development. METHODS: Non-smokers, smokers (non-COPD), and COPD patients were randomly selected in an established COPD surveillance cohort. Demographic and clinical information of all subjects were collected. Pulmonary function was measured by post-bronchodilator testing. qRT-PCR and ELISA assays were performed to detect the expression levels of lncRNA LUCAT1, miR-181a-5p, and inflammatory cytokines. An in vitro exposure model was constructed using cigarette smoke extract (CSE)-induced human bronchial epithelial (16HBE) cells. The dual-luciferase reporter and RNA pull-down assays were used to detect the binding relationship between lncRNA LUCAT1 and miR-181a-5p; meanwhile, Spearman's correlation assay was used to verify the correlation between lncRNA LUCAT1 and miR-181a-5p. Afterward, the lncRNA LUCAT1 silencing plasmid was constructed and co-transfected with a miR-181a-5p inhibitor to evaluate the effects on CSE-induced 16HBE cell proliferation and apoptosis. Finally, a Western blot assay was utilized to determine the mechanism of lncRNA LUCAT1/miR-181a-5p/Wnt/ß-catenin axis in COPD. RESULTS: LncRNA LUCAT1 was upregulated in the serums of COPD patients. Correlation analysis further confirmed the strong correlation between LUCAT1 expression and inflammatory cytokines IL-1ß, IL-6, and TNF-α. Receiver operating characteristic (ROC) analysis verified the potential of LUCAT1 in COPD diagnosis. After treatment with CSE, LUCAT1 was significantly increased while its target miR-181a-5p was decreased in 16HBE cells. Cell proliferation and apoptosis assays showed that LUCAT1 silencing alleviated CSE's effects on 16HBE cell proliferation and apoptosis. Mechanically, rescue assays demonstrated that miR-181a-5p inhibition could partially counteract the impact of LUCAT1 on COPD progression through the Wnt/ß-catenin pathway. CONCLUSIONS: LncRNA LUCAT1 may be a valuable indicator for differentiating COPD. Moreover, LncRNA LUCAT1/miR-181-5p/Wnt/ß-catenin axis behaved as a critical role in COPD development, shedding new sights for clinical treatment.

Engineering Pichia pastoris to improve S-adenosyl- l-methionine production using systems metabolic strategies.

S-adenosyl-l-methionine (SAM) is a highly valued chemical that can be used as a dietary supplement and has been used to treat depression, osteoarthritis, and liver problems as well. We adopted systems metabolic engineering strategies to improve SAM production in a high-producing strain (GS115/DS56). First, the cystathionine ß-synthase gene CYS4 was downregulated using a weak promoter PG12 to reduce the removal of homocysteine from SAM cycle, thus leading to a 48.8% increase in the SAM titer (1.68 g/L) from the strain G12-CBS, while preventing cysteine auxotrophy induced by deletion of this essential gene. Subsequently, the SAM titer of G12-CBS was improved to 13.01 g/L in 15-L fed-batch fermentation using the optimal l-methionine feeding strategy. Finally, based on comparative transcriptomics, five genes were chosen and overexpressed for further enhancement of SAM production. Among them, GDH2 and ACS2 exhibited positive effects, and the additional overexpression of GDH2 led to a 52.3% increase of titer (2.71 g/L) in shake flask culture. Therefore, the engineered Pichia pastoris strains can be utilized in industrial production of SAM using a simple and cost-effective process, and these approaches could be employed for improving the production of other chemicals by P. pastoris.

STAT1 determines aggressiveness of glioblastoma both in vivo and in vitro through wnt/ß-catenin signalling pathway.

Glioblastoma is one of the most malignant tumors and causes the high mortality in cancer patients. Currently, there is no highly efficient therapy against glioblastoma. Therefore, searching for a new molecular target to anti-glioblastoma therapy is urgent and necessary. In this study, we elucidated the role of Signal transducer and activator of transcription 1 (STAT1) in proliferation, migration and apoptosis of glioblastoma cells. We found that STAT1 downregulation could weaken the aggressiveness of glioblastoma cells. Besides, the glioblastoma growth in vivo was also inhibited with the STAT1 downregulation by shRNA as well as by pharmacological stimulation withSTAT1inhibitors. This negative regulation of tumor growth was accompanied by the inhibition in epithelial-mesenchymal transition (EMT), whereas the STAT1 overexpression promoted EMT. Furthermore, the involvement of wnt/ß-catenin was observed in STAT1 downregulation mediated weakness in glioblastoma aggressiveness since application of activator wnt agonist 1 could counteract the inhibitory effect induced by STAT1 downregulation. Collectively, this work provided the evidence to support the conclusion that STAT1 can regulate the glioblastoma growth and migration, potentially serving as a therapeutic target against glioblastoma. SIGNIFICANCE OF THE STUDY: Glioblastoma is one of the most malignant tumors with very high mortality. Until now, there is no efficient therapy against glioblastoma. In this study, we found downregulation of Signal transducer and activator of transcription 1 (STAT1) could weaken the aggressiveness of glioblastoma cells through inhibition in epithelial-mesenchymal transition, mediated through wnt/ß-catenin signalling pathway. Thus, this work supported the regulatory role of STAT1 in glioblastoma growth and migration. This potentially serves as a new therapeutic target against glioblastoma.

Characterization of the metabolites of rosmarinic acid in human liver microsomes using liquid chromatography combined with electrospray ionization tandem mass spectrometry.

Rosmarinic acid (RA) is a phenolic acid originally isolated from the herb medicine Rosmarinus officinalis. The purpose of this study was to identify the metabolites of RA. RA was incubated with human liver microsomes in the presence of ß-nicotinamide adenine dinucleotide phosphate tetrasodium salt and/or uridine diphosphate glucuronic acid using glutathione (GSH) as a trapping agent. After 60-min incubation, the samples were analyzed using high-resolution liquid chromatography tandem mass spectrometry. Under the current conditions, 14 metabolites were detected and identified. Our data revealed that RA was metabolized through the following pathways: the first pathway is the oxidation of catechol to form ortho-quinone intermediates, which react with GSH to form mono-GSH adducts (M1, M2, and M3) and bis-GSH adducts (M4 and M5); the second pathway is conjugation with glucuronide to yield acylglucuronide (M7), which further reacts with GSH to form RA-S-acyl-GSH adduct (M9); the third pathway is hydroxylation to form M10, M11, and M12, which further react with GSH to form mono-GSH adducts (M13 and M14); the fourth pathway is conjugation with GSH through Michael addition (M6); the fifth pathway is conjugation with glucuronidation, forming M8, which is the major metabolic pathway of RA.

Superhydrophobic Coating for Antifouling of Chinese Paintings.

In the past 10 years, many studies on superhydrophobic (SH) papers have been reported. However, these works are rarely carried out on Chinese paintings. Compared with pure paper, the complexity of Chinese black ink and pigment, caused by including animal glue and fixatives allowing the nanoparticles to disperse in water, negatively affects the formation of SH coatings. In this work, we report the fabrication of SH coatings using fluorine silicon sol containing an epoxy group on Chinese paintings. Briefly, SiO2 nanoparticles were mixed with KH560 and FAS-17 and formed fluorine silicon sol. Then the sol was coated on the Chinese paintings. After drying, the SH coating was created. It can protect Chinese paintings and prevent them from being fouled by various liquids. Six types of beverages and ink can be repelled by the as-prepared SH coatings. Moreover, Chinese black ink can also be washed away from the SH coatings using water, without leaving any traces of ink behind. The SH coatings did not affect the appearance and internal structure of the Chinese paintings. Furthermore, due to covalent link, the SH coatings have good mechanical properties with regard to bending tests (120 times), finger pressing tests, and friction tests. The SH coatings also show an excellent high temperature resistance. This study has important applications for antifouling of Chinese paintings or oil paintings from dirty water.

D-shaped photonic crystal fiber plasmonic refractive index sensor based on gold grating.

In this work, we proposed a high-resolution D-shaped photonic crystal fiber (PCF) surface plasmon resonance (SPR) sensor based on gold grating. Gold grating is introduced to modulate the resonance wavelength and enhance the refractive index (RI) sensitivity. Structure parameters of PCF and gold grating are analyzed by the finite element method for optimizing the SPR sensor. The simulation results indicate that air hole pitch, air hole diameter, and gold thickness and grating constant have little influence on the sensitivity of the refractive index, which reduces the requirement of precise processing. For improving the resolution of RI sensing, a two-feature (2F) interrogation method, which combines wavelength interrogation and amplitude interrogation, is used. The maximum theoretical resolution of the SPR sensor reaches to 5.98×10-6 RIU in the range of 1.36-1.38, and the wavelength sensitivity reaches to 3340 nm/RIU. The proposed SPR sensor shows potential applications for developing a high-sensitivity, real-time, and fast-response SPR-RI sensor.

BMP10 inhibited the growth and migration of gastric cancer cells.

Bone morphogenetic protein 10 (BMP10), a novel member of BMP family, has been identified as an important regulator for angiogenesis. Dysregulation of BMP has been observed in several cancer types. However, its roles in gastric cancer (GC) remain unknown. In this study, the expression of BMP10 was found to be down-regulated in GC samples. Forced expression of BMP10 in GC cells inhibited its growth and migration, while knocking down the expression of BMP10 in GC cells promoted cell growth, migration, and metastasis. BMP10 was shown to negatively regulated beta-catenin/TCF signaling by up-regulating Axin protein level. Taken together, the present study revealed the suppressive function of BMP10 in gastric cancer.

Hypoxia-inducible factor-1α and erythropoietin expression in the hippocampus of neonatal rats following hypoxia-ischemia.

In some regions of the hippocampus, neurogenesis persists throughout life and is upregulated following hypoxia/ischemia. The mechanisms underlying the upregulation of neurogenesis, however, are not known. Here we examined the expression of two factors thought to be involved in hypoxia-related neurogenesis, hypoxia-inducible factor-1α (HIF-1α) and brain-derived erythropoietin (EPO), in the hippocampus of neonatal rats following hypoxia-ischemia. Sprague-Dawley rat pups were exposed to hypoxia-ischemia conditions or hypoxia conditions only. For the hypoxia-ischemia experiment, the left common carotid artery of Sprague-Dawley rat pups was ligated on postnatal day 7. The pups were exposed to hypoxic conditions and then returned to normoxia for re-oxygenation. Immunohistochemical staining was performed to evaluate EPO and HIF-1α expression at various time points after re-oxygenation (1 h, 6 h, 16 h, 1 d, 3 d, and 7 d). EPO expression in the hippocampus was verified using Western blot studies. For the hypoxia-only experiment, postnatal day 7 rat pups were continuously exposed to hypoxic conditions for different durations (0.5 h, 1 h, 2 h, 3 h, and 5 h). HIF-1α expression in the hippocampus was evaluated by immunohistochemical staining. In the hypoxia-ischemia group, EPO expression was significantly altered. The EPO expression increased during re-oxygenation, peaked at 16 h, and decreased thereafter. In the hypoxia-only group, the EPO protein was not detectable. When the rat pups were returned to normoxia for re-oxygenation, there was no HIF-1α expression. HIF-1α immunoreactivity was present in the hypoxia-only group and peaked in rats exposed to continuous hypoxic conditions for 3 h. In addition, endogenous EPO increased in the neonatal rats after the hypoxia-ischemia event. Furthermore, HIF-1α was induced as a result of hypoxia. We postulate that disruption of homeostasis triggers and enhances hippocampal neurogenesis. Thus, HIF-1α/EPO hypoxic signal transduction may initiate hippocampal neurogenesis following hypoxia-ischemia.

Diet pills and deception: A content analysis of weight-loss, muscle-building, and cleanse and detox supplements videos on TikTok.

The promotion of harmful dieting-related products, including weight-loss, muscle-building, and cleanse/detox supplements, is pervasive across TikTok. Use of these products has been associated with eating pathology, and in some instances, increased risk of an eating disorder diagnosis. To inform eating disorders prevention and public health intervention, a content analysis was conducted to analyze the promotional features of the most viewed videos as of June 2022 in the U.S. across popular dieting product-related hashtags (#dietpills, #preworkout, #detox) (N = 233 videos). Investigators watched and coded videos using a codebook that captured details about featured individuals, product claims and details, and other video elements (e.g., language, use of popular music). Descriptive statistics were obtained to analyze trends within and across product hashtags. A total of 78 #dietpills, 86 #preworkout, and 69 #detox videos met study criteria. Videos promoting weight-loss and cleanse/detox products overwhelmingly featured feminine-presenting (70.5 % and 71 %, respectively) and thin (35.9 % and 44.9 %) individuals, while #preworkout video subjects were mostly masculine-presenting (73.3 %) and muscular (61.6 %). Most did not disclose their credentials (93.6 %) nor identify whether the promotion of the product was sponsored by the retailer (95.7 %). The vast majority of videos (97 %) did not provide any scientific evidence to support health- and appearance-related claims. The most popular videos promoting dieting-related supplements on TikTok overwhelmingly make unsubstantiated health claims, posing substantial risks for social media users who are vulnerable to their usage and associated health risks, including engagement in disordered eating.