How widespread use of generative AI for images and video can affect the environment and the science of ecology.

Generative artificial intelligence (AI) models will have broad impacts on society including the scientific enterprise; ecology and environmental science will be no exception. Here, we discuss the potential opportunities and risks of advanced generative AI for visual material (images and video) for the science of ecology and the environment itself. There are clearly opportunities for positive impacts, related to improved communication, for example; we also see possibilities for ecological research to benefit from generative AI (e.g., image gap filling, biodiversity surveys, and improved citizen science). However, there are also risks, threatening to undermine the credibility of our science, mostly related to actions of bad actors, for example in terms of spreading fake information or committing fraud. Risks need to be mitigated at the level of government regulatory measures, but we also highlight what can be done right now, including discussing issues with the next generation of ecologists and transforming towards radically open science workflows.

Dynamic source credibility and its impacts on knowledge revision.

Corrections to readers' misconceptions should result in higher belief when information sources are of high credibility. However, evaluations of credibility may be malleable, and we do not yet fully understand how changes to a source's credibility influence readers' credibility evaluations and knowledge revision outcomes. Thus, in two experiments, we examined how updating a source's credibility (Experiment 1: initially neutral sources later updated to be high-, low-, or neutral-credibility sources; Experiment 2: initially high- or low-credibility sources later updated to be low- or high-credibility sources) influenced knowledge revision and source credibility evaluations after readers engaged with refutation and non-refutation texts. Results showed that readers revised their credibility judgments from neutral-, high-, and low-credibility initial evaluations, indicating that source judgments are malleable rather than fixed. In addition, refutations from sources that are later revealed to be of high credibility can facilitate revision of both knowledge and initial source credibility evaluations.

Acknowledging religion in cognitive behavioural therapy: The effect on alliance, treatment expectations and credibility in a video-vignette study.

OBJECTIVES: Developing mental health services which are accessible and acceptable to those from minority backgrounds continues to be a priority. In the United Kingdom, individuals who identify with a religion are underrepresented in Talking Therapies services as compared to those with no religion. This necessitates an understanding of how therapy is perceived. This online study explored the impact of explicitly acknowledging religion on anticipated alliance, treatment credibility and expectations of therapy in a non-clinical sample of British Muslims. METHODS: A video-vignette experimental design was used in which participants who self-reported as either high or low in religiosity were randomly allocated to receiving information about cognitive behavioural therapy either with or without an explicit mention of religion as a value in the therapeutic process. RESULTS: One hundred twenty-nine British Muslim adults aged 18-70+ years from various ethnic backgrounds participated in the study. Between-subjects ANOVAs showed that scores on the perceived credibility of therapy and treatment expectations were significantly higher when religion was explicitly mentioned by the 'therapist', but that acknowledging religion did not impact upon anticipated alliance. CONCLUSIONS: These findings suggest that mentioning religion as a value to be considered in therapy has some positive impacts upon how therapy is perceived by British Muslims. Although video vignettes do not provide insight into the complexity of actual therapeutic encounters, acknowledging religion in mental health services more broadly remains an important consideration for improving equity of access and may bear relevance to other minoritized groups.

Medical Misinformation in Polish on the World Wide Web During the COVID-19 Pandemic Period: Infodemiology Study.

BACKGROUND: Although researchers extensively study the rapid generation and spread of misinformation about the novel coronavirus during the pandemic, numerous other health-related topics are contaminating the internet with misinformation that have not received as much attention. OBJECTIVE: This study aims to gauge the reach of the most popular medical content on the World Wide Web, extending beyond the confines of the pandemic. We conducted evaluations of subject matter and credibility for the years 2021 and 2022, following the principles of evidence-based medicine with assessments performed by experienced clinicians. METHODS: We used 274 keywords to conduct web page searches through the BuzzSumo Enterprise Application. These keywords were chosen based on medical topics derived from surveys administered to medical practitioners. The search parameters were confined to 2 distinct date ranges: (1) January 1, 2021, to December 31, 2021; (2) January 1, 2022, to December 31, 2022. Our searches were specifically limited to web pages in the Polish language and filtered by the specified date ranges. The analysis encompassed 161 web pages retrieved in 2021 and 105 retrieved in 2022. Each web page underwent scrutiny by a seasoned doctor to assess its credibility, aligning with evidence-based medicine standards. Furthermore, we gathered data on social media engagements associated with the web pages, considering platforms such as Facebook, Pinterest, Reddit, and Twitter. RESULTS: In 2022, the prevalence of unreliable information related to COVID-19 saw a noteworthy decline compared to 2021. Specifically, the percentage of noncredible web pages discussing COVID-19 and general vaccinations decreased from 57% (43/76) to 24% (6/25) and 42% (10/25) to 30% (3/10), respectively. However, during the same period, there was a considerable uptick in the dissemination of untrustworthy content on social media pertaining to other medical topics. The percentage of noncredible web pages covering cholesterol, statins, and cardiology rose from 11% (3/28) to 26% (9/35) and from 18% (5/28) to 26% (6/23), respectively. CONCLUSIONS: Efforts undertaken during the COVID-19 pandemic to curb the dissemination of misinformation seem to have yielded positive results. Nevertheless, our analysis suggests that these interventions need to be consistently implemented across both established and emerging medical subjects. It appears that as interest in the pandemic waned, other topics gained prominence, essentially "filling the vacuum" and necessitating ongoing measures to address misinformation across a broader spectrum of health-related subjects.

High-intensity interval training is feasible, credible and clinically effective in the early subacute stroke stage in the low-income country of Benin.

High-intensity interval training (HIIT) has been shown to benefit stroke patients when implemented three months post-stroke. This study examined HIIT's feasibility and clinical effectiveness in the early post-stroke stage in Benin. This was a prospective interventional study comprising an HIIT programme executed on a recumbent bike, three times/week, 20-30 min/session for 6 weeks, added to a conventional physiotherapy. The primary outcomes were feasibility, credibility and expectancy assessed with credibility and expectancy questionnaire. A maximal exercise test, 6-min walking test (6MWT), 10-m walking test (10mWT), Berg balance scale (BBS) and five repetitions sit-to-stand test (5 R-STS) were performed before and after the training programme. Ten outpatients, with a median age [P25-P75]: 63.5[56.7-71.2] years; time since stroke: 15.0[9.7-21.0] days, started and completed all training sessions without serious adverse events. High scores were observed on the Credibility subscale at admission (27.0[25.7-27.0]), which remained so after intervention (26.5[25.7-27.0]). Expectancy subscale scores were high at admission (25.5[24.0-27.0]) and post-training (25.5[24.5-27.0]). Peak workload (p < 0.001), BBS (p < 0.001), 6MWT (p < 0.001), 10mWT (p < 0.001) and 5 R-STS (p = 0.004) were all improved. HIIT is feasible and safe in the early subacute post-stroke stage and is perceived by patients as highly credible, meeting their expectations of recovery.

Approachability and Credibility of Virtual Character Faces: The Role of the Horizontal Viewing Angle.

OBJECTIVE: The present work explores how the horizontal viewing angle of a virtual character's face influences perceptions of credibility and approachability. BACKGROUND: When encountering virtual characters, people rely both on credibility and approachability judgments to form a first impression of the depicted virtual character. Research shows that certain perceptions are preferred either on frontal or tilted faces, but not how approachability or credibility judgments relate to horizontal viewing angles in finer granularity between 0° and 45°. METHOD: 52 participants performed a two-alternative forced choice (2AFC) task rating 240 pairwise comparisons of 20 virtual character faces shown in four horizontal viewing angles (0°, 15°, 30°, and 45°) on approachability and credibility. They also rated scales on individual differences based on the BIS-BAS framework (behavioral inhibition system, drive, and reward responsiveness), self-esteem, and personality traits (neuroticism, loneliness). RESULTS: Both approachability and credibility were negatively related to the horizontal viewing angle, but the negative relationship was less pronounced for approachability. Notably, 15° tilted faces were associated with higher approachability than frontal faces by people scoring high in reward responsiveness, drive, and self-esteem, and scoring low in neuroticism and loneliness. CONCLUSION: Our findings highlight the conditions under which showing a virtual character's face is preferred in a horizontally 15° tilted over a frontal position. APPLICATION: The differential impact of the horizontal viewing angle on approachability and credibility should be considered when displaying virtual character faces.

Multi-level decisions for addressing trade-off in the cross-regional water-environment-agriculture interactive system under constraint of water ecological carrying capacity.

The complex-enhanced hierarchical relationship among multiple stakeholders in the water-environment-agriculture interactive system has been overlooked. This study develops a leader-follower-enhanced framework (named as FCMLP) that integrates variable-weight combination prediction model, multi-level programming, and fuzzy credibility constrained programming, which can effectively address the above problems under uncertainties. Five water ecological carrying capacity (WECC) statuses are treated as a critical constraint into the modeling framework to improve the accuracy of decision-making. An interactive fuzzy satisfaction algorithm is advanced for solving this multi-level problem, in which COD discharge minimization, economic benefits maximization, and grain yield maximization are taken as the upper-, middle-, and lower-level goals, respectively. The framework is applied to plan the cross-regional water-environment-agriculture interactive system in the Beijing-Tianjin-Hebei and Yangtze River Economic Belt. Solutions reveal that increased WECC status and credibility level would decrease 1.40%-1.74%, 0.71%-9.61%, and 1.63%-2.26% of water resources allocation, COD emissions, and economic benefits, respectively. Crop area and grain yield would dramatically decline by 4.13%-4.46% and 4.03%-4.67% when a credibility level increases from 0.8 to 1, respectively. The overall satisfactory degree would range from 0.58 to 0.70, which illustrates interactive decision-making process of multiple stakeholders. Significant differences can be observed in the optimized schemes of water resources allocation and environmental-economic-agricultural performances among various models. The amounts of allocated water resources, pollutant discharge, and economic output from the FCMLP model would be respectively 11.30%-13.45%, 14.90%-15.21%, and 73.12%-73.48% higher than those from the environment- and agriculture-oriented schemes, yet 13.81%, 32.05%, and 15.29% lower than those from the economy-oriented scheme. Some water adaptability countermeasures are given for ensuring the scientific operation of the South-to-North Water Transfer Project and alleviating conflicts between water source and receiving areas. Further exploration of the optimization scheme of water-environment-energy-agriculture system driven by climate change is still required for guaranteeing the dynamic balance of regional resources.

Finnish district judges' assessments of live versus video-mediated party statements in court.

The increase in remote hearings after the COVID-19 pandemic presents an urgent need to examine how judges assess video-mediated witness and party statements compared with live statements. There is currently a limited body of research on this subject. As for the assessment itself, professionals within the judicial system sometimes believe they can detect deception based on visible cues such as body language and emotional expression. Research has, however, shown that lies cannot be detected based on such cues. The Finnish Supreme Court has also given rulings in accordance with the scientific literature. In this study, we used a survey to investigate how much importance a Finnish sample of district judges (N = 47) gave to several variables pertaining to the statement or the statement giver, such as body language and emotional expression. We also investigated the association between the judges' beliefs about the relevance of body language and emotional expression and their preference for live statements or statements via videoconference. The judges reported giving more importance to body language and emotional expression than legal psychology research and Finnish Supreme Court rulings would call for. Our results also indicated that there was a slight bias to assess live statements more favorably than statements given via videoconference, as well as a slight bias in favor of the injured party. More effort must be put into making judges and Supreme Courts aware of findings in legal psychology to avoid biases based on intuitive reasoning where it is contrary to scientific evidence.

[Ritual sexual abuse : Orientation to patient well-being in a polarized debate]. / Ritueller sexueller Missbrauch : Orientierung am Patientenwohl in einer polarisierten Debatte.

BACKGROUND: The background to this article is a polarized media debate about ritual violence against children in German speaking countries. Two opposing positions have formed, which are unable to engage in a reasonable exchange with each other. OBJECTIVE: The article therefore aims to contribute to bridging the differences and argues, above all in the interests of patient well-being, for positioning oneself beyond polarization and to reflect on an evidence-base in treatment as well as in scientific discourse. MATERIAL AND METHODS: The article is based on a critical examination of exemplary scientific literature, public investigation reports and diverse media coverage. RESULTS: In certain psychotraumatology circles and in the media (especially on social media, such as telegram), there is a conspiracy narrative about a large network of perpetrators who inflict the most serious sexual violence on children in a ritual context. An uncritical belief in this has already led to mistreatment of patients and also to a fundamental mistrust of their statements. This threatens these already vulnerable patients with further harm, which contradicts the basic principles of medical ethics.

Therapist and treatment credibility in treatment outcomes: A systematic review and meta-analysis of clients' perceptions in individual and face-to-face psychotherapies.

OBJECTIVE: No systematic review was identified investigating the influence of perceived therapist credibility on treatment outcomes. Extant treatment credibility reviews have focused on early perceptions without considering influence of various therapy phases. This study aimed to examine the relationship between perceived treatment and therapist credibility and treatment outcomes, while considering the timing of the credibility assessment as a potential moderator. METHOD: Articles published in English peer-reviewed journals containing at least one quantitative measure of credibility and treatment outcome regarding face-to-face therapist-delivered interventions were eligible. PsycINFO, MEDLINE and Embase online databases were last searched on April 5th, 2023, and the Effective Public Health Practice Project tool was used to assess the study quality. Correlations between treatment credibility and outcomes, and therapist credibility were calculated separately. RESULTS: Analysis of 27 studies revealed a positive association between perceived treatment credibility and treatment outcome (r = 0.15,95%CI = 0.09,0.21,p < 0.001,n = 2061). Nine studies showed a strong association between perceived therapist credibility and outcome (r = 0.35,95%CI = 0.18,0.51;p < .001,n = 1161). No significant moderator found in both meta-analyses. CONCLUSION: Findings suggest that clients' perceptions of higher credibility - whether concerning the treatment or the therapist - are associated with better therapeutic outcomes. Constraints in inclusion criteria and the small sample size in eligible studies were notable limitations.

Voters and the IMF: Experimental Evidence From European Crisis Countries.

IMF interventions are often associated with rising political discontent in countries where the Fund intervenes. Studies examining this relationship, however, face the challenge of disentangling the impact of the IMF from the impact of the crisis that triggered the intervention. To address this challenge, we conduct survey experiments in Greece, Ireland, Portugal, and Spain and directly assess how voters evaluate the costs and benefits of an IMF intervention. We find that voters believe that the crisis will more likely be solved when the IMF intervenes, but they are also critical of the corresponding loss of national sovereignty. Because the former consideration, on average, dominates their assessment, IMF interventions increase the support of voters for unpopular economic policies. Nonetheless, cross-country differences suggest that continued public support for intervention hinges on the IMF's ability to deliver on its promise to help resolve the crisis.

"We Never Stop Singing": The Dynamics of the Mental and Physical Health of Czech Religious Pastors during the COVID-19 Pandemic.

This study explores the dynamics of coping strategies of Czech religious leaders during a peak of the COVID-19 pandemic. An interpretative phenomenological analysis reveals that mental health among pastors is closely linked to a need to maintain community and social contact, while physical health is related to limitations upon ritual elements. In all narratives, the lived experience of mental health in the form of prosocial behavior is significantly prioritized despite the possibility of spreading infection. The analysis also shows that maintaining the community is closely linked to risky behaviors, which positively affected group and individual well-being.

The use of nonverbal communication when assessing witness credibility: a view from the bench.

The aim of this article is to provide a better understanding of how, in practice, judges use nonverbal communication during bench trials. The article starts with an overview of legal rules on how judges are supposed to assess witness credibility and use nonverbal communication, and briefly addresses the impact of those rules on lower courts and the limited data about judges in bench trials. Subsequently, we present the methods and the results from an online survey carried out with Quebec judges. While a number of judges have beliefs consistent with the scientific literature, findings reported in this article show that many judges have beliefs inconsistent with the scientific literature, and many are silent on culture-related differences in nonverbal behavior. The article ends with a discussion on the implications of the results for scholars and practitioners, including why findings reported in this article are cause for concern for adversarial justice systems.

Are popular books about diet and health written based on scientific evidence? A comparison of citations between the USA and Japan.

OBJECTIVES: To describe and compare the references cited in popular books about diet and health between the USA and Japan. DESIGN: Books were selected based on their best-seller rankings in the diet and health category of online bookstores. We identified references throughout all pages of the books and examined the number of references, reference format (identifiable or not) and presence of specific types of references, such as systematic reviews of human research. We compared the characteristics of references between the two countries and examined related factors to citation. SETTING: Cross-sectional study. PARTICIPANTS: Books (n 100 in each country). RESULTS: Among 100 books from each country, sixty-five US and sixty-six Japanese books had references. Forty-five US books cited more than 100 references, against only five Japanese books. The number of books that cited systematic reviews of human research differed between the USA (n 49) and Japan (n 9). Additionally, the number of books that provided identifiable information for all references was significantly higher in the USA (n 63) than in Japan (n 42). Books whose first authors have licences of medical doctors were more likely to cite references than those without in both countries. CONCLUSIONS: Two-thirds of books about diet and health cited references in both the USA and Japan, but Japanese books cited fewer references and were less likely to cite systematic reviews and provide identifiable references than US books. Further research into the scientific reliability of information in books about diet and health is warranted.

Hashtag fitspiration: credibility screening and content analysis of Instagram fitness accounts.

BACKGROUND: Fitspiration is a social media phenomenon purported to inspire viewers to lead healthier lifestyles but can result in negative psychological outcomes such as body dissatisfaction. This study aimed to develop a tool to audit Instagram fitspiration accounts and screen for content that could have potentially negative psychological effects. METHODS: This study developed and implemented an audit tool to (1) identify credible fitspiration accounts (i.e., accounts that do not portray potentially harmful or unhealthy content) and (2) describe the content of identified accounts. The most recent 15 posts of 100 leading Instagram fitspiration accounts were audited. Accounts were deemed non-credible and were excluded if they contained fewer than four fitness-related posts or portrayed nudity or inappropriate clothing, sexualisation or objectification, extreme body types, "thinspiration", or negative messages. RESULTS: Many accounts contained fewer than four fitness-related posts (n = 41), sexualisation or objectification (n = 26), nudity or inappropriate clothing (n = 22), and/or extreme body types (n = 15). Three accounts failed on all four criteria, while 13, 10 and 33 failed on three, two, or one criterion, respectively. Therefore, only 41% of accounts were considered credible. Inter-rater reliability (percentage agreement and Brennan and Prediger's coefficient κq) was high (Stage 1: 92% agreement [95% CI 87, 97], κq 0.84 [95% CI 0.73, 0.95]; Stage 2: 93% agreement [95% CI 83, 100], κq 0.85 [95% CI 0.67, 1.00]). Account holders of credible fitspiration accounts were predominantly female (59%), aged 25-34 (54%), Caucasian (62%), and from the United States (79%). Half held a qualification related to physical activity or physical health (e.g., personal trainer, physiotherapy; 54%). Most included accounts included an exercise video (93%) and example workout (76%). CONCLUSION: While many popular Instagram fitspiration accounts offered credible content such as example workouts, many accounts contained sexualisation, objectification or promotion of unhealthy or unrealistic body shapes. The audit tool could be used by Instagram users to ensure the accounts they follow do not portray potentially harmful or unhealthy content. Future research could use the audit tool to identify credible fitspiration accounts and examine whether exposure to these accounts positively influences physical activity.

Online information acquisition affects food risk prevention behaviours: the roles of topic concern, information credibility and risk perception.

BACKGROUND: The COVID-19 pandemic has not only brought great challenges to the global health system but also bred numerous rumours about food safety. Food safety issues have once again attracted public attention. METHODS: The data were drawn from the fifth wave of the first Taiwan Communication Survey database. The respondents were selected via multistage stratified random sampling. The sampling units were townships/districts, villages/neighbourhoods and households. The sample consisted of 2098 respondents. This study first used propensity value matching to analyse the direct impact of online food safety information acquisition on preventive behaviours and examined the heterogeneous impact caused by the difference in the degree of topic attention through value matching. Hayes' PROCESS macro model 6 was applied to confirm the mediating effect and the serial mediating effect. RESULTS: The research results show that an increase in the frequency of the acquisition of online food safety information significantly increases individuals' food risk prevention behaviour. However, only users with high concern about the issue are affected. The food risk prevention behaviour of users with low concern about this issue is not affected by the acquisition of online food safety information. Further analysis shows that risk perception and information credibility both play mediating roles in the impact of online food safety information acquisition on food risk prevention behaviour. Moreover, the transmission and united effects of information credibility and risk perception play a distal mediating role. CONCLUSIONS: Food risk prevention behaviours are an important topic for personal health as well as government management. Our study's findings can provide empirical evidence for risk managers and decision-makers to reevaluate the role of the internet in food risk management.

Whom to trust? Inferred source credibility and response borrowing in a memory task.

We investigated whether people can discriminate between sources of information that are either credible or respond at random, based only on their own knowledge and the responses provided by these sources. In three experiments, participants were asked to judge the validity of trivia statements. Some statements were accompanied by true/false responses provided by either a credible source or a source whose responses were random. In Experiment 1, participants first saw a set of easy questions, which provided the basis for assessing the relative credibility of the sources, before responding to a set of difficult questions, where response borrowing was assessed. In Experiments 2 and 3, participants solved a test composed of difficult questions only, but only after studying the correct responses to all these questions. In Experiment 2, there was no delay between the study and test phases, whereas in Experiment 3, the delay was 24 hours. In all experiments, more participants explicitly identified the more credible source in the postexperimental questionnaire than misidentified the noninformative source as credible. However, differentiated response borrowing-borrowing more responses from the credible than the noninformative source-emerged only in Experiment 2. Therefore, people can often explicitly infer source credibility from the responses the sources provide. However, using these inferences to regulate response borrowing is relatively less likely and happens only under specific, favorable circumstances.

Mechanisms in continued influence: The impact of misinformation corrections on source perceptions.

Research on the continued influence effect (CIE) of misinformation has demonstrated that misinformation continues to influence people's beliefs and judgments even after it has been corrected. Although most theorizing about the CIE attempts to explain why corrections do not eliminate belief in and influences of the misinformation, the present research takes a different approach and focuses instead on why corrections do reduce belief in misinformation (even if not entirely). We examined how a correction can change perceptions of the original source of the misinformation and how these changes in perceptions can mediate continued influence effects. We also examined causal evidence linking manipulations of misinformation source perceptions to continued belief and misinformation-relevant inferential reasoning. Study 1 demonstrated that an external correction (i.e., a new source labeling misinformation as false) influences perceptions of the misinformation source, and these perceptions of the misinformation source then correlated with belief in the misinformation. Study 2 replicated the results of Study 1 and used source derogation to manipulate misinformation source perceptions and further lessen continued belief. Study 3 was a preregistered replication of previous results using new methodology. These studies suggest that perceptions of the misinformation source is one mechanism that can cause changes in belief in misinformation, and changes in the perception of a source can be achieved simply by correcting the source or through other means. This approach can be used to find other mechanisms responsible for reducing belief in misinformation.

The combined effect of front-of-package labels and influencer recommendations on food choice decisions.

Many governments have adopted front-of-pack nutrition labels (FOP labels) that give advice about how healthy a product is. An increasing number of digital food influencers are also informing consumers about the nutritional quality of products and promoting healthy consumption. In this context, the current study analyzes how both sources of information come together to affect purchase intention. Drawing on congruence theory, we propose that the influencer's recommendation reinforces the effect of the FOP label when there is congruence between the two; however, consumers clearly prefer to follow the recommendation of the influencer over the FOP label when the information sources are non-congruent. We develop a between-subjects experimental design in which the level of congruence between the two information sources is manipulated. The effect of the influencer on purchase intention is mediated by the credibility of the FOP label. A second study confirms the superiority of the influencer effect observed in the first study.

Characterizing Precision Nutrition Discourse on Twitter: Quantitative Content Analysis.

BACKGROUND: It is possible that tailoring dietary approaches to an individual's genomic profile could provide optimal dietary inputs for biological functioning and support adherence to dietary management protocols. The science required for such nutrigenetic and nutrigenomic profiling is not yet considered ready for broad application by the scientific and medical communities; however, many personalized nutrition products are available in the marketplace, creating the potential for hype and misleading information on social media. Twitter provides a unique big data source that provides real-time information. Therefore, it has the potential to disseminate evidence-based health information, as well as misinformation. OBJECTIVE: We sought to characterize the landscape of precision nutrition content on Twitter, with a specific focus on nutrigenetics and nutrigenomics. We focused on tweet authors, types of content, and presence of misinformation. METHODS: Twitter Archiver was used to capture tweets from September 1, 2020, to December 1, 2020, using keywords related to nutrition and genetics. A random sample of tweets was coded using quantitative content analysis by 4 trained coders. Codebook-driven, quantified information about tweet authors, content details, information quality, and engagement metrics were compiled and analyzed. RESULTS: The most common categories of tweets were precision nutrition products and nutrigenomic concepts. About a quarter (132/504, 26.2%) of tweet authors presented themselves as science experts, medicine experts, or both. Nutrigenetics concepts most frequently came from authors with science and medicine expertise, and tweets about the influence of genes on weight were more likely to come from authors with neither type of expertise. A total of 14.9% (75/504) of the tweets were noted to contain untrue information; these were most likely to occur in the nutrigenomics concepts topic category. CONCLUSIONS: By evaluating social media discourse on precision nutrition on Twitter, we made several observations about the content available in the information environment through which individuals can learn about related concepts and products. Tweet content was consistent with the indicators of medical hype, and the inclusion of potentially misleading and untrue information was common. We identified a contingent of users with scientific and medical expertise who were active in discussing nutrigenomics concepts and products and who may be encouraged to share credible expert advice on precision nutrition and tackle false information as this technology develops.