Xiao-Ban-Xia Decoction Alleviates Chemotherapy-Induced Nausea and Vomiting by Inhibiting Ferroptosis via Activation of The Nrf2/SLC7A11/GPX4 Pathway.

Chemotherapy-induced nausea and vomiting (CINV) represents the common gastrointestinal side effect for cancer patients. Xiao-Ban-Xia decoction (XBXD), a classical anti-emetic traditional Chinese medicine formula, is frequently used for the clinical treatment of CINV. This study used a cisplatin-induced rat pica model to explore whether the anti-emetic mechanism of XBXD in treating CINV is related to ferroptosis. The inflammatory damage of the gastrointestinal tract is evaluated by HE staining and ELISA. The degree of ferroptosis are validated by the iron deposition, the levels of ROS, MDA, and GSH, and the ultrastructure of mitochondria in the gastric antrum and ileum. The potential ferroptosis-related targets of XBXD against CINV are screened by network pharmacology and further assessed by Western blot. XBXD significantly decreased the kaolin consumption in rats, and improved the inflammatory pathological damage, with decreased levels of HMGB1, IL-1ß, and TNF-α. Furthermore, XBXD significantly suppressed ferroptosis, as indicated by the improvement of iron deposition, mitochondrial abnormalities, and oxidative stress. The network pharmacology and Western blot results indicated that XBXD activated the Nrf2/SLC7A11/GPX4 signaling pathway. This study proved that XBXD activates the Nrf2/SLC7A11/GPX4 signaling pathway, thereby inhibiting ferroptosis, which represents a critical anti-emetic mechanism of XBXD in combatting CINV.

"Phones off while school's on": Evaluating problematic phone use and the social, wellbeing, and academic effects of banning phones in schools.

Background and aims: Mobile phone bans in secondary schools are claimed to reduce student distraction and promote learning and face-to-face socializing. Currently, the evidence on phone bans is limited. The aim of this preregistered study was to evaluate the South Australian mobile phone ban's effects on students' problematic phone use, academic engagement, school belonging, and bullying. The study also sought to identify student variables that predict phone ban compliance. Methods: As the ban was phased in over 2023, a 2 (phone ban: yes/no) × 2 (time: baseline, 1-month follow-up) repeated-measures design was employed. Students (n = 1,282 at baseline; n = 1,256 at follow-up) in Grades 7 to 12 were recruited from five public secondary schools. Surveys included measures drawn from the Longitudinal Study of Australian Children (LSAC) and the Programme for International Student Assessment (PISA). Results: Problematic phone use was reported by 2.6% of the sample. Being older and a more frequent user of social media predicted lower phone ban compliance. Linear mixed models indicated that ban and no ban school groups did not differ significantly in terms of problematic phone use, academic engagement, and school belonging. There was slightly higher bullying in the ban group but bullying decreased significantly in both groups. Discussion: Imposing access restrictions may not affect the underlying psychological mechanisms that drive problematic phone use. Although these results indicate limited to no short-term benefits of the ban, further evaluation with more sensitive methodologies is recommended. Conclusions: Student-technology interactions in learning institutions should be continually monitored to determine the optimal balance to support student etiquette, learning, and wellbeing.

Discussion of Heated Tobacco Products on Twitter Following IQOS's Modified-Risk Tobacco Product Authorization and US Import Ban: Content Analysis.

BACKGROUND: Understanding public opinions about emerging tobacco products is important to inform future interventions and regulatory decisions. Heated tobacco products (HTPs) are an emerging tobacco product category promoted by the tobacco industry as a "better alternative" to combustible cigarettes. Philip Morris International's IQOS is leading the global HTP market and recently has been subject to important policy events, including the US Food and Drug Administration's (FDA) modified-risk tobacco product (MRTP) authorization (July 2020) and the US import ban (November 2021). Although limited in their legal implications outside the United States, these policy events have been quoted in global news outlets and Philip Morris International's promotional communications, showing how they may potentially impact global tobacco regulation. Given the impending return of IQOS to the US market, understanding how the policy events were received through social media discourse will provide valuable insights to inform global tobacco control policy. OBJECTIVE: This study aims to examine HTP-related social media discourse around important policy events. METHODS: We analyzed HTP-related posts on Twitter during the time period that included IQOS's MRTP authorization in the United States and the US import ban, examining personal testimonial, news/information, and direct marketing/retail tweets separately. We also examined how the tweets discussed health and policy. A total of 10,454 public English tweets (posted from June 2020 to December 2021) were collected using HTP-related keywords. We randomly sampled 2796 (26.7%) tweets and conducted a content analysis. We used pairwise co-occurrence analyses to evaluate connections across themes. RESULTS: Tweet volumes peaked around IQOS-related policy events. Among all tweets, personal testimonials were the most common (1613/2796, 57.7%), followed by news/information (862/2796, 30.8%) and direct marketing/retail (321/2796, 11%). Among personal testimonials, more tweets were positive (495/1613, 30.7%) than negative (372/1613, 23.1%), often comparing the health risks of HTPs with cigarettes (402/1613, 24.9%) or vaping products (252/1613, 15.6%). Approximately 10% (31/321) of the direct marketing/retail tweets promoted international delivery, suggesting cross-border promotion. More than a quarter of tweets (809/2796, 28.9%) discussed US and global policy, including misinterpretation about IQOS being a "safer" tobacco product after the US FDA's MRTP authorization. Neutral testimonials mentioning the IQOS brand (634/1613, 39.3%) and discussing policy (378/1613, 23.4%) showed the largest pairwise co-occurrence. CONCLUSIONS: Results suggest the need for careful communication about the meaning of MRTP authorizations and relative risks of tobacco products. Many tweets expressed HTP-favorable opinions referring to reduced health risks, even though the US FDA has denied marketing of the HTP with reduced risk claims. The popularity of social media as an information source with global reach poses unique challenges in health communication and health policies. While many countries restrict tobacco marketing via the web, our results suggest that retailers may circumvent such regulations by operating overseas.

Munich's selective diesel vehicle ban and its impact on nitrogen dioxide concentrations: A quasi-experimental study.

BACKGROUND: The current limit on NO2 concentrations of 40 µg/m3, set by the European Union, has been regularly exceeded in Munich, Germany. This limit will likely be reduced towards the WHO recommended target of 10 µg/m3. Against this backdrop, the city implemented a selective diesel vehicle ban within the existing low-emission zone in February 2023, targeting Euro 4 and older diesel vehicles. Our study investigated the effect of Munich's selective diesel vehicle ban on NO2 concentrations, focusing on the half-year period following its implementation. METHODS: Our study utilized a synthetic control approach (primary analysis) and a controlled interrupted time series approach (secondary analysis). These quasi-experimental methodologies create a 'counterfactual' no-intervention scenario, enabling comparison between observed and counterfactual scenarios to estimate an intervention effect. We employed historical controls, using routine data from multiple monitoring stations located within and outside the low-emission zone for 2014 to 2022, and considered possible confounders. RESULTS: NO2 concentrations within Munich's low-emission zone showed overall declining trends from August 2014 to July 2023. Effects of the selective diesel vehicle ban were small and wide confidence intervals indicate large uncertainty in the magnitude and direction of the effect. At Landshuter Allee, the average intervention effect was -2.67 µg/m3 (95 %-CI = [-12.72; 7.38]), at Stachus it was -2.74 µg/m3 (95 %-CI = [-9.91; 4.42]), and at Lothstrasse it was -1.03 µg/m3 (95 %-CI = [-7.75; 5.69]). The secondary analysis confirmed these findings, reinforcing uncertainty about the effect of the intervention. CONCLUSION: Our study suggests that Munich's selective diesel vehicle ban had a limited effect on lowering NO2 concentrations. Possible explanations include the ban's focus on Euro 4 and older diesel vehicles, many exemptions to the selective ban, and unclear enforcement. This highlights that comprehensive approaches and ongoing, well-designed monitoring and evaluation are crucial for addressing urban air pollution and protecting public health.

Challenges and solutions to banning the advertisement of unhealthy products: a qualitative study.

Unhealthy products (food, alcohol, tobacco) are among the main risk factors of non-communicable diseases. To discourage the consumption of these products, Iran has passed a law banning the advertisement of unhealthy products in all media and for all age groups. The purpose of the present study was to identify the challenges of this approach and provide evidence to facilitate the enforcement process and the participation of stakeholders. In this qualitative study participants were selected from the policymakers and experts involved in the banning of advertisements on unhealthy products in Iran. Semi-structured interviews were conducted with 24 specialists and experts. The participants were selected through purposive and snowball sampling. Identified challenges and solutions were divided into three categories and nine themes: external (political, social, and economic); interorganizational (mission and communication); and internal (planning, organization, leadership, and control). Banning the advertisement of unhealthy products involves many challenges due to the existence of key players with different roles and missions. If these challenges are not managed effectively, they will hinder the enforcement and success of this law. Therefore, it is necessary for policymakers and health system managers to take the necessary measures to remove these obstacles.

Peripheral Substitution Engineering of MR-TADF Emitters Embedded With B‒N Covalent Bond Towards Efficient BT.2020 Blue Electroluminescence.

Compared with the classical boron/nitrogen (B/N) doped ones, multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters embedded with B-N covalent bond behave a significantly blue-shifted narrowband TADF, and thus show a greater potential in ultrapure blue organic light-emitting diodes (OLEDs). As a proof of concept, herein a peripheral substitution engineering is demonstrated based on such a B‒N embedded parent core. The simple approach is found to ensure easy synthesis via a one-pot lithium-free borylation-annulation, manipulate the excited states through different electronic coupling between core and substituent, and introduce the steric hindrance to minimize the unwanted spectral broadening. Impressively, ultrapure blue OLEDs are realized to give a high external quantum efficiency of 20.3% together with Commission Internationale de l'Éclairage coordinates of (0.152, 0.046). The performance is well competent with those of B/N doped MR-TADF emitters, clearly highlighting that the B‒N embedded framework is a novel promising paradigm towards efficient BT.2020 blue standard.

A Tricyclic Framework with Integrated B←N and Cyano Dual Functionalization for Superior n-Type Organic Electronics.

n-Type conjugated polymers featuring low-lying lowest unoccupied molecular orbital (LUMO) energy levels are essential for achieving high-performance n-type organic thin-film transistors (OTFTs) and organic thermoelectrics (OTEs). However, the synthesis of acceptors with strong electron-withdrawing characteristics presents a significant challenge. Herein, a peripheral functionalization strategy is employed on the widely used tricyclic framework anthracene by introducing dual N,O-bidentate BF2/B(CN)2 groups to enhance its electron-withdrawing capability. This approach successfully navigates synthetic challenges, leading to the development of two novel acceptor building blocks: DBNF and DBNCN. Compared to the counterparts with a single N,O-bidentate BF2/B(CN)2 moiety, DBNF and DBNCN exhibit an extended π-backbone, enhanced molecular packing, and improved electron-withdrawing properties. Utilizing these innovative acceptor monomers, copolymers, PDBNF and PDBNCN, are synthesized, which exhibit considerably suppressed LUMO ≈ -4.0 eV. The deep LUMO of PDBNF together with its favourable bimodal packing orientation leads to remarkable electron mobility of 3.04 cm² V⁻¹ s⁻¹ with improved stability in OTFTs. Importantly, efficient n-doping in OTEs is achieved with PDBNCN, exhibiting exceptional conductivity of 95.5 S cm⁻¹ and a maximum power factor of 147.8 µW m⁻¹ K⁻²-among the highest reported for solution-processed n-type polymers.

A 3D Robust and Microporous B←N Framework with 8-connected Sandwich Nodes for Efficient Separation of Hexane Isomers.

Recently B←N organic frameworks (BNFs) have gained substantial attention owing to their unique dative bond energy, which imparts them with specialized functionalities across a broad spectrum of applications. Despite previous reports on BNFs with permanent porosity, research endeavors towards three-dimensional (3D) BNFs with similar properties are scarce, with no report of robust 3D BNFs featuring permanent porosity to date. Herein, electrostatic complementary strategy is proposed to construct the first example of 3D robust and microporous BNF, BNF-100, featuring a reo topology with 8-connected sandwich nodes assembled via dative B←N bonds. The activated form BNF-100 a exhibits excellent chemical stability and permanent porosity with Langmuir surface area of 645.9 m2 g-1 and pore volume of 0.23 cm3 g-1. BNF-100 a can efficiently separate hexane isomers through sieving mechanisms, as confirmed by vapor adsorption experiments and dynamic breakthrough tests, surpassing the performance of most MOF materials. Finally, we achieved the purification of different branched hexane isomers using a single breakthrough column in a combined breakthrough and purging experiment, which is the first reported instance in the literature on hexane isomer separation.

Imposex incidence in gastropod species from the Colombian Caribbean Coast reveals continued and widespread tributyltin contamination after its global ban.

Organotin compounds (OTCs), such as tributyltin (TBT) and triphenyltin (TPhT), are released in aquatic environments from antifouling coatings and can cause imposex, an abnormal condition where female snails develop male sexual characteristics. This study investigates temporal variations in imposex incidence along the Colombian Caribbean coast following the 2008 global ban on TBT-based antifouling paints. Over a 12-year period, we assessed imposex in 1,384 adults snails from six species (58% female and 42% male) during 2012, 2016, and 2023. In 2012, just four years after the ban, imposex incidence in some sites reached 100% in the neogastropods Purpura patula, Stramonita haemastoma, Stramonita rustica, and Thais deltoideia. In 2016, imposex in some sites reached 81% for the mesogastropod Strombus pugilis and 39% for the neogastropod Melongena melongena. By 2023, imposex decreased for the first four neogastropods, persisted for S. pugilis, and increased for M. melongena only in Cartagena Bay and the Tolú marina. These findings indicate a general decline in imposex over time, aligning with the ban, but also suggest potential new sources of contamination as imposex rates increased in some previously unaffected areas.

Public Mass Shootings: Counterfactual Trend Analysis of the Federal Assault Weapons Ban.

Background: Assault weapon and large-capacity magazine bans are potential tools for policy makers to prevent public mass shootings. However, the efficacy of these bans is a continual source of debate. In an earlier study, we estimated the impact of the Federal Assault Weapons Ban (FAWB) on the number of public mass shooting events in the United States. This study provides an updated assessment with 3 additional years of firearm surveillance data to characterize the longer-term effects. Objective: This study aims to estimate the impact of the FAWB on trends in public mass shootings from 1966 to 2022. Methods: We used linear regression to estimate the impact of the FAWB on the 4-year simple moving average of annual public mass shootings, defined by events with 4 or more deaths in 24 hours, not including the perpetrator. The study period spans 1966 to 2022. The model includes indicator variables for both the FAWB period (1995-2004) and the period after its removal (2005-2022). These indicators were interacted with a linear time trend. Estimates were controlled for the national homicide rate. After estimation, the model provided counterfactual estimates of public mass shootings if the FAWB was never imposed and if the FAWB remained in place. Results: The overall upward trajectory in the number of public mass shootings substantially fell while the FAWB was in place. These trends are specific to events in which the perpetrator used an assault weapon or large-capacity magazine. Point estimates suggest the FAWB prevented up to 5 public mass shootings while the ban was active. A continuation of the FAWB and large-capacity magazine ban would have prevented up to 38 public mass shootings, but the CIs become wider as time moves further away from the period of the FAWB. Conclusions: The FAWB, which included a ban on large-capacity magazines, was associated with fewer public mass shooting events, fatalities, and nonfatal gun injuries. Gun control legislation is an important public health tool in the prevention of public mass shootings.

Nomophobia (no-mobile-phone phobia) among the undergraduate medical students.

Nomophobia (no-mobile-phone phobia) is the fear and anxiety of being without a mobile phone. This study pioneers the investigation of nomophobia in Afghanistan using the Nomophobia Questionnaire (NMP-Q), addressing a crucial gap in the field. We collected statistical data from 754 undergraduate medical students, comprising men (56.50 %) and women (43.50 %), and analyzed the dimensions of nomophobia. While results revealed that all but two participants were nomophobic, they identified three significant dimensions affecting the level of nomophobia among participants: (a) gender, (b) age, and (c) marital status. The study's contributions are precious, given the peculiarity of Afghan political turmoil, security, and human rights issues, especially for women. For example, the study's data collection was abruptly halted in December 2022 due to the Taliban regime's decision to make it illegal for women to enroll in universities as students. Therefore, while examining the characteristics of nomophobia across societies is imperative, it is also vital to investigate what is true of one society, Afghanistan, at one point in time and space. The study concludes by emphasizing the need to broaden participants' scope in future studies to better understand the prevalence of nomophobia across broader societal contexts and forces.

Inequalities in Smoking and E-Cigarette Use in Young Adults With Mental Ill-Health, 20 years After Ireland's Smoking Ban.

Background: Ireland's Smoking Ban reduced health inequalities known to be associated with smoking but some groups may not have benefitted. Mental ill-health and smoking are known to be associated with health inequalities. Whether similar patterns exist for e-cigarette use is less clear, as few data exist. Objectives: To examine: (1) self-reported doctor-diagnosed mental ill-health in Irish 20-year-olds; (2) smoking, e-cigarette, and dual use in those with and without mental ill-health; and (3) protective and risk factors for smoking and e-cigarette use in these groups. Methods: We use cross-sectional data from 20 year-olds in Wave 4 of Growing Up in Ireland Child Cohort. They were asked to self-report mental ill-health which had been diagnosed by a clinician, and their smoking and e-cigarette use. All analyses were performed using SPSS v27. Results: 19.4% (n = 1008) of the total sample (n = 4729) reported a mental ill-health diagnosis. Comparing those with and without, those with mental ill-health had significantly higher prevalence of current smoking (47%, n = 419 vs 36%, n = 1361; OR 1.57, CI: 1.36, 1.82), e-cigarette use (17%, n = 152 vs 13%, n = 485; OR 1.40, CI:1.15, 1.70), and dual use (12%, n = 109 vs 9%, n = 328; OR 1.46, CI:1.16, 1.84). Risk factors for smoking and e-cigarette use were, earlier smoking initiation, peers or primary caregivers who smoked, being in paid employment, one-parent family background, and social media use. Being female was protective. Most risk factors were significantly higher in young adults with mental ill-health but, after adjusting for these variables, respondents with mental ill-health still have significantly higher adjusted higher odds of smoking (aOR 1.28, CI:1.05, 1.56). Conclusions: Inequalities in smoking and e-cigarette use in young adults with mental ill-health are evident 20 years after Ireland's National Smoking Ban. Despite extensive Tobacco Control interventions in the past 20 years, there is still need in Ireland for new targeted interventions to reduce health inequalities for left-behind young smokers with mental ill-health.

A scoping review of policies related to reducing energy drink consumption in children.

BACKGROUND: Frequent consumption of Energy Drinks (EDs) is associated with numerous health problems, including overweight and obesity, particularly among children and adolescents. The extensive promotion, wide accessibility, and relatively low cost of EDs have significantly increased their popularity among this age group. This paper examines policies/programs that, directly and indirectly, contribute to reducing ED consumption in children and adolescents and shares global experiences to help policymakers adopt evidence-based policies. METHODS: A systematic search was performed using PubMed, Scopus, and Web of Science databases from January 2000 to June 2024, along with reputable international organization websites, to find literature on policies aimed at reducing ED consumption among children and adolescents. All sources meeting the inclusion criteria were included without restrictions. Titles and abstracts were initially screened, followed by a full-text review. After evaluating the quality of the selected studies, data were extracted and, along with information from the selected documents, compiled into a table, detailing the country, policy type, and the effectiveness and weaknesses of each policy. RESULTS: Out of 12166 reviewed studies and documents, 84 studies and 70 documents met the inclusion criteria. 73 countries and territories have implemented policies like taxation, sales bans, school bans, labeling, and marketing restrictions on EDs. Most employ fiscal measures, reducing consumption despite enforcement challenges. Labeling, access restrictions, and marketing bans are common but face issues like black markets. CONCLUSION: This scoping review outlines diverse strategies adopted by countries to reduce ED consumption among children and teenagers, such as taxation, school bans, sales restrictions, and labeling requirements. While heightened awareness of ED harms has reinforced policy efforts, many Asian and African nations lack such measures, some policies remain outdated for over a decade, and existing policies face several challenges. These challenges encompass industry resistance, governmental disagreements, public opposition, economic considerations, and the intricacies of policy design. Considering this, countries should tailor policies to their cultural and social contexts, taking into account each policy's strengths and weaknesses to avoid loopholes. Inter-sectoral cooperation, ongoing policy monitoring, updates, and public education campaigns are essential to raise awareness and ensure effective implementation.

Trading one problem for two: The case against tobacco bans.

The past two decades have seen growing calls for the "tobacco endgame." Its advocates are united by their commitment to two ideas. First, tobacco-related harms represent a catastrophic health emergency, and second, current tobacco-control approaches are an inadequate response to the scale of that emergency. To endgame advocates, tobacco policy should have more ambitious goals than merely "controlling" tobacco. Instead, it should aim to bring about a smoke-free world. While a range of different policies are included under the umbrella of the "tobacco endgame," the most radical proposal is for a complete ban on tobacco. Its advocates argue that in addition to improving global public health, an effective ban on tobacco would also promote overall autonomy and would have important egalitarian benefits. This article critically examines these arguments for a tobacco ban. I argue that they rely on idealizing assumptions about the likely effects of a ban. Because an effective ban would require robust enforcement to control the illegal market in tobacco, it would be more likely to undermine autonomy and equality than it would be to promote them. By relying on idealizing assumptions and ignoring the likely consequences of a tobacco ban, advocates of a ban obscure, rather than clarify, both the policy debate and the ethical stakes. I conclude by considering the ways that idealizing assumptions should-and should not-play a role in debates about ethical issues in public policy.

Neurobehavioral, neurotransmitter and redox modifications in Nauphoeta cinerea under mixed heavy metal (silver and mercury) exposure.

Heavy metals are encountered in nature, and are used in several human endeavors, including in dental fillings. It is well known that the safety of metals depends on their chemical form, as well as the dose and route through which biological systems are exposed to them. Here, we used the Nauphoeta cinerea model to examine the mechanism by which salts of the heavy metals used in dental fillings - silver and mercury - exert their neurotoxicity. Nymphs exposed to heavy metals presented with reduced motor and exploratory abilities as they spent more time immobile, especially in the periphery of a novel object, and covered less distance compared with control nymphs. Exposure to AgNO3 and HgCl2 also exacerbated levels of oxidative stress markers (MDA & ROS) and the neurotransmitter regulators - AChE and MAO, while reducing antioxidant activity markers, both in biochemical (thiol & GST) and RT-qPCR (TRX, GST, SOD, Catalase) examinations, in neural tissues of the cockroach. The observed disruptions in neurolocomotor control, synaptic transmission and redox balance explain how heavy metal salts may predispose organisms to neurological disorders.

Perspectives of Gender-Diverse Youth and Caregivers Facing Gender-Affirming Medical Intervention Bans.

Purpose: In the past 2 years, nearly all 50 states have debated bills seeking to ban minors' access to gender-affirming medical interventions, with many being passed into law. This study documents gender-diverse youths' (GDY) and their caregivers' experiences as they grapple with how such laws impact their families. Methods: Sixteen GDY and 16 caregivers participating in a longitudinal study of the impact of gender-affirming care on GDYs' well-being were interviewed about how the legal and social discourse was impacting them and their families. When interviewed, some participants had completed only the initial intake, others had completed the intake and an initial medical consultation, and a few had recently started gender-affirming hormones. Thematic analysis was used to identify common threads in the youths' and caregivers' experiences. Results: Four main themes were identified: Direct effects of losing access to gender-affirming medical interventions, reflecting how losing access to care would impact well-being; growing hostility toward the gender-diverse community, noting increasing social negativity; personal and social upheaval, reflecting the many aspects of families' lives affected; and galvanization into social action, documenting drives to effect social change. Conclusion: Laws banning gender-affirming medical interventions impact GDY and their families beyond limiting access to medical care. They increase the social stressors, cause social network disruptions, increase hostility toward the gender-diverse community, and lead some GDY and caregivers to engage more politically to protect their community. Gender-affirming health care providers need to recognize how the social and political environment impact GDY and their families to provide high-quality, person-centered care.

Domestic and international impacts of rice export restrictions: The recent case of indian non-basmati rice.

This study examines the impact of India's export restrictions on domestic retail rice prices using a dynamic panel GARCH model. The findings suggest that export restrictions are not a sufficient condition to lower domestic prices. Export restrictions are associated with lower retail price volatility in the East Zone. Moreover, the international price transmission to a sample of Asian and African economies shows that all countries are vulnerable, but the degree and kinds of vulnerability differ. Rice exporters appear to be the most susceptible as domestic prices increase in these countries. Rice importers are also vulnerable because of price increases, but the increases are less than in countries where the private sector decides on import quantities.

Erosion of fish trophic position: an indirect effect of fishing on food webs elucidated by stable isotopes.

Fishing has significant trophodynamic impacts on marine communities, including reductions in the mean trophic position (TP) of the ecosystem resulting from a decrease in the abundance and size of species and individuals with high TPs. This study demonstrates the erosion of fish TP, an additional process that results in lower TP of individuals of a given size, which may exacerbate the effects of fishing on the food web. A stable isotope approach based on the tRophicPosition Bayesian method was used to quantify the TP of 12 target marine species at a given length, and compare their TP between fishery-restricted areas and trawled areas. The results show a difference in the TP of six benthic and apical nekto-benthic predators, which feed in the median at about 0.5 TP lower in trawled areas. It appears that current 'fishing down marine food webs' analyses may underestimate the trophic effects of fishing. Accounting for changes in trophodynamics of individuals at a given size is important to detect indirect effects through food web interactions. The application of a trawling ban may lead to the restoration of lost trophic structure; however, trophic changes may occur more slowly than changes in biomass. This article is part of the theme issue 'Connected interactions: enriching food web research by spatial and social interactions'.