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Ethnic Differences in the Prevalence of Type 2 Diabetes Diagnoses in the UK: Cross-Sectional Analysis of the Health Improvement Network Primary Care Database.
Pham, TM, Carpenter, JR, Morris, TP, Sharma, M, Petersen, I
Clinical epidemiology. 2019;11:1081-1088
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Type 2 diabetes mellitus is associated with substantial disease burden, including increased mortality risk and significant long-term morbidity. The aim of this study was to examine the prevalence of type 2 diabetes diagnoses based on primary care electronic health records. This study is a cross-sectional analysis of health records data from The Health Improvement Network primary care database. The sample comprised 51% women; most of the individuals in the sample (approximately 80%) were below 60 years of age. Results show that compared with those of White ethnicity, the likelihood of having a type 2 diabetes diagnosis was more than double among Asian people, 65% more likely among Black people, and 17% more likely among people of Mixed/Other ethnicity. Authors conclude that accurate estimates of ethnic prevalence of type 2 diabetes are important for ensuring that public health resources are allocated appropriately for diabetes screening and lifestyle interventions.
Abstract
AIMS/HYPOTHESIS Type 2 diabetes mellitus is associated with high levels of disease burden, including increased mortality risk and significant long-term morbidity. The prevalence of diabetes differs substantially among ethnic groups. We examined the prevalence of type 2 diabetes diagnoses in the UK primary care setting. METHODS We analysed data from 404,318 individuals in The Health Improvement Network database, aged 0-99 years and permanently registered with general practices in London. The association between ethnicity and the prevalence of type 2 diabetes diagnoses in 2013 was estimated using a logistic regression model, adjusting for effect of age group, sex, and social deprivation. A multiple imputation approach utilising population-level information about ethnicity from the UK census was used for imputing missing data. RESULTS Compared with those of White ethnicity (5.04%, 95% CI 4.95 to 5.13), the crude percentage prevalence of type 2 diabetes was higher in the Asian (7.69%, 95% CI 7.46 to 7.92) and Black (5.58%, 95% CI 5.35 to 5.81) ethnic groups, while lower in the Mixed/Other group (3.42%, 95% CI 3.19 to 3.66). After adjusting for differences in age group, sex, and social deprivation, all minority ethnic groups were more likely to have a diagnosis of type 2 diabetes compared with the White group (OR Asian versus White 2.36, 95% CI 2.26 to 2.47; OR Black versus White 1.65, 95% CI 1.56 to 1.73; OR Mixed/Other versus White 1.17, 95% CI 1.08 to 1.27). CONCLUSION The prevalence of type 2 diabetes was higher in the Asian and Black ethnic groups, compared with the White group. Accurate estimates of ethnic prevalence of type 2 diabetes based on large datasets are important for facilitating appropriate allocation of public health resources, and for allowing population-level research to be undertaken examining disease trajectories among minority ethnic groups, that might help reduce inequalities.
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Trends in incidence of total or type 2 diabetes: systematic review.
Magliano, DJ, Islam, RM, Barr, ELM, Gregg, EW, Pavkov, ME, Harding, JL, Tabesh, M, Koye, DN, Shaw, JE
BMJ (Clinical research ed.). 2019;366:l5003
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Incidence measures the proportion of people who develop diabetes over a period of time among the population at risk. The aim of this study is to systematically review literature which reports diabetes incidence trends. This study is a systemic review of 47 studies. A total of 62% (n=29) of the studies exclusively reported on type 2 diabetes, and 38% (n=18) reported on total diabetes. Findings show that the incidence of diagnosed diabetes increased in most populations from the 1960s to the early 2000s, after which a pattern emerged of levelling trends in 30% and declining trends in 36% of the reported populations. Preventive strategies could have contributed to the fall in diabetes incidence in recent years. Authors conclude that improvement of the collection, availability, and analysis of incidence data will be important to effectively monitor the epidemic and guide prevention efforts into the future.
Abstract
OBJECTIVE To assess what proportions of studies reported increasing, stable, or declining trends in the incidence of diagnosed diabetes. DESIGN Systematic review of studies reporting trends of diabetes incidence in adults from 1980 to 2017 according to PRISMA guidelines. DATA SOURCES Medline, Embase, CINAHL, and reference lists of relevant publications. ELIGIBILITY CRITERIA Studies of open population based cohorts, diabetes registries, and administrative and health insurance databases on secular trends in the incidence of total diabetes or type 2 diabetes in adults were included. Poisson regression was used to model data by age group and year. RESULTS Among the 22 833 screened abstracts, 47 studies were included, providing data on 121 separate sex specific or ethnicity specific populations; 42 (89%) of the included studies reported on diagnosed diabetes. In 1960-89, 36% (8/22) of the populations studied had increasing trends in incidence of diabetes, 55% (12/22) had stable trends, and 9% (2/22) had decreasing trends. In 1990-2005, diabetes incidence increased in 66% (33/50) of populations, was stable in 32% (16/50), and decreased in 2% (1/50). In 2006-14, increasing trends were reported in only 33% (11/33) of populations, whereas 30% (10/33) and 36% (12/33) had stable or declining incidence, respectively. CONCLUSIONS The incidence of clinically diagnosed diabetes has continued to rise in only a minority of populations studied since 2006, with over a third of populations having a fall in incidence in this time period. Preventive strategies could have contributed to the fall in diabetes incidence in recent years. Data are limited in low and middle income countries, where trends in diabetes incidence could be different. SYSTEMATIC REVIEW REGISTRATION Prospero CRD42018092287.
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Pharmaceutical Interventions in Chronic Fatigue Syndrome: A Literature-based Commentary.
Richman, S, Morris, MC, Broderick, G, Craddock, TJA, Klimas, NG, Fletcher, MA
Clinical therapeutics. 2019;41(5):798-805
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Myalgic encephalomyelitis, also known as Chronic Fatigue Syndrome (ME/ CFS), is a disease characterized by an inability to exert oneself physically, often coupled with a combination of other symptoms, including sleep disorders, severe unpredictable pain, and compromised cognitive abilities. The aim of this review was to delineate a number of the more prominent treatments for ME/CFS into different categories and evaluate the methods and results of corresponding drug trials. Results indicate that: • antiviral drugs appear to show limited efficacy in treating ME/CFS over a broad demographic. • there is a lack of clinical research focusing on the use of specific cyclooxygenase-2 inhibitors [analgesic] to treat ME/CFS. • antidepressants may be of use in delivering improvements in the quality of life of patients with ME/CFS. • recalibration of endocrine-immune regulation may be involved in supporting the persistence of ME/CFS and may be responsible at least in part for its resistance to single agent interventions. Authors conclude that there is a great need for larger, longitudinal studies focused on a more clearly defined subset of ME/CFS as well as a greater consideration of potential synergies between interventions and the suitability of combination therapies.
Abstract
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a debilitating disorder characterized by prolonged periods of fatigue, chronic pain, depression, and a complex constellation of other symptoms. Currently, ME/CFS has no known cause, nor are the mechanisms of illness well understood. Therefore, with few exceptions, attempts to treat ME/CFS have been directed mainly toward symptom management. These treatments include antivirals, pain relievers, antidepressants, and oncologic agents as well as other single-intervention treatments. Results of these trials have been largely inconclusive and, in some cases, contradictory. Contributing factors include a lack of well-designed and -executed studies and the highly heterogeneous nature of ME/CFS, which has made a single etiology difficult to define. Because the majority of single-intervention treatments have shown little efficacy, it may instead be beneficial to explore broader-acting combination therapies in which a more focused precision-medicine approach is supported by a systems-level analysis of endocrine and immune co-regulation.
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Internet-Delivered Acceptance and Commitment Therapy for Anxiety Treatment: Systematic Review.
Kelson, J, Rollin, A, Ridout, B, Campbell, A
Journal of medical Internet research. 2019;21(1):e12530
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Anxiety and its related conditions are highly prevalent on a global scale. A potential solution for people with anxiety is Acceptance and Commitment Therapy (ACT)—a psychological treatment that teaches mindfulness skills to help people accept their anxiety and commit to living in accordance with personal values. The aim of this study was to provide a comprehensive and up-to-date account on the empirical status of internet-delivered ACT for anxiety. This study is a systemic review of 20 studies. More than half of the studies were randomised control trials. Findings indicate small-to-large anxiety reductions among participants (suffering from generalized anxiety disorder, social anxiety disorder and illness anxiety disorder) after internet-derived ACT on standardized measures (studies n=18), thus indicating the beneficial impact of internet-derived ACT on anxiety. Authors conclude that their current findings indicate that internet-derived ACT can be an effective and acceptable treatment for some anxiety conditions among young to middle aged adults in Western societies.
Abstract
BACKGROUND Anxiety conditions are debilitating and prevalent throughout the world. Acceptance and Commitment Therapy (ACT) is an effective, acceptance-based behavioral therapy for anxiety. However, there are treatment barriers (eg, financial, geographical, and attitudinal), which prevent people from accessing it. To overcome these barriers, internet-delivered ACT (iACT) interventions have been developed in recent years. These interventions use websites to deliver ACT information and skill training exercises on the Web, either as pure self-help or with therapist guidance. OBJECTIVE This systematic review aimed to examine the therapeutic impact of iACT on all anxiety conditions. METHODS The EMBASE, MEDLINE, ProQuest Central, PsycINFO, Scopus, and Web of Science databases were searched up to September 2018. The titles and abstracts of remaining records after deduplication were screened by 2 authors with a total of 36 full-text articles being retained for closer inspection next to eligibility criteria. Empirical studies of all designs, population types, and comparator groups were included if they appraised the impact of iACT treatment on any standardized measure of anxiety. Included studies were appraised on methodological quality and had their data extracted into a standardized coding sheet. Findings were then tabulated, and a narrative synthesis was performed because of the heterogeneity found between studies. RESULTS A total of 20 studies met inclusion criteria. There were 11 randomized controlled trials (RCTs) and 9 uncontrolled pilot studies. Participants across all studies were adults. The anxiety conditions treated were as follows: generalized anxiety disorder (GAD), social anxiety disorder (SAD), illness anxiety disorder (IAD), and general anxiety symptoms, with or without comorbid physical and mental health problems. A total of 18 studies reported significant anxiety reduction after iACT treatment. This was observed in studies that delivered iACT with (n=13) or without (n=5) therapist guidance. The average attrition rate across all included studies during the active iACT treatment phase was 19.19%. In the 13 studies that assessed treatment satisfaction, participants on average rated their iACT experience with above average to high treatment satisfaction. CONCLUSIONS These findings indicate that iACT can be an efficacious and acceptable treatment for adults with GAD and general anxiety symptoms. More RCT studies are needed to corroborate these early iACT findings using empirical treatments in active control groups (eg, internet-delivered cognitive behavioral therapy). This would potentially validate the promising results found for SAD and IAD as well as address the full spectrum of anxiety disorders.
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Maternal allergen-specific IgG might protect the child against allergic sensitization.
Lupinek, C, Hochwallner, H, Johansson, C, Mie, A, Rigler, E, Scheynius, A, Alm, J, Valenta, R
The Journal of allergy and clinical immunology. 2019;144(2):536-548
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Analysis of allergen-specific IgE responses in birth cohorts with allergens has provided detailed information regarding the development of specific IgE responses in children. Data regarding early development of allergen-specific IgG is needed. The aim of this study is to investigate whether maternal allergen-specific IgG can protect against IgE sensitization in their children. Plasma samples were taken from mothers during the third trimester, cord blood, breast milk collected 2 months after delivery; and from children at 6, 12, and 60 months of age. These samples were analysed for IgG reactivity to 164 allergens in 99 families. IgE sensitizations to allergens were determined at 5 years of age in the children. Children who were IgE sensitized against an allergen at 5 years of age had significantly higher allergen-specific IgG levels than non-sensitised children. For all 164 tested allergens, children from mothers with higher levels of specific plasma IgG levels against an allergen had no IgE sensitizations against that allergen at 5 years of age. High levels of allergen-specific IgG in mothers during the third trimester and in cord blood seem to protect against allergic sensitization in offspring. This finding has implications for allergy prevention.
Abstract
BACKGROUND Analysis of allergen-specific IgE responses in birth cohorts with microarrayed allergens has provided detailed information regarding the evolution of specific IgE responses in children. High-resolution data regarding early development of allergen-specific IgG are needed. OBJECTIVE We sought to analyze IgG reactivity to microarrayed allergens in mothers during pregnancy, in cord blood samples, in breast milk, and in infants in the first years of life with the aim to investigate whether maternal allergen-specific IgG can protect against IgE sensitization in the offspring. METHODS Plasma samples from mothers during the third trimester, cord blood, breast milk collected 2 months after delivery, and plasma samples from children at 6, 12, and 60 months of age were analyzed for IgG reactivity to 164 microarrayed allergens (ImmunoCAP ISAC technology) in 99 families of the Swedish birth cohort Assessment of Lifestyle and Allergic Disease During Infancy (ALADDIN). IgE sensitizations to microarrayed allergens were determined at 5 years of age in the children. RESULTS Allergen-specific IgG reactivity profiles in mothers, cord blood, and breast milk were highly correlated. Maternal allergen-specific IgG persisted in some children at 6 months. Children's allergen-specific IgG production occurred at 6 months and reflected allergen exposure. Children who were IgE sensitized against an allergen at 5 years of age had significantly higher allergen-specific IgG levels than nonsensitized children. For all 164 tested allergens, children from mothers with increased (>30 ISAC standardized units) specific plasma IgG levels against an allergen had no IgE sensitizations against that allergen at 5 years of age. CONCLUSION This is the first detailed analysis of the molecular IgG recognition profile in mothers and their children in early life. High allergen-specific IgG reactivity in the mother's plasma and breast milk and in cord blood seemed to protect against allergic sensitization at 5 years of age.
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Serological investigation of IgG and IgE antibodies against food antigens in patients with inflammatory bowel disease.
Wang, HY, Li, Y, Li, JJ, Jiao, CH, Zhao, XJ, Li, XT, Lu, MJ, Mao, XQ, Zhang, HJ
World journal of clinical cases. 2019;7(16):2189-2203
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Crohn's disease and ulcerative colitis are relapsing gut inflammatory diseases that are usually referred to as Inflammatory Bowel Disease (IBD). It may be triggered by an imbalance in immune response in response to environmental factors such as diet. The aim of this retrospective study was to evaluate the presence of IgG and IgE mediated antibodies to food antigens in IBD patients. There were one hundred and thirty-seven IBD patients participating in this study, including forty Ulcerative colitis patients and ninety-seven Crohn's disease patients against fifty healthy controls to test serum IgG antibodies to fourteen specific food antigens and serum IgE antibodies to fourteen specific food antigens. There were significantly higher IgG antibodies in response to food antigens in Crohn's disease patients than in Ulcerative colitis patients and healthy controls. Food antigens such as tomato, corn, egg, rice, and soybean exhibited varying levels of IgG antibody responses in Crohn's disease patients and ulcerative colitis patients. Smokers were more likely to develop IgG reactions. Further robust research is needed to examine more IgG-specific food antigens to help manage IBD with an elimination rotation diet. The results of this study can help healthcare professionals understand the importance of diagnosing food intolerances when treating IBD.
Abstract
BACKGROUND Food antigens have been shown to participate in the etiopathogenesis of inflammatory bowel disease (IBD), but their clinical value in IBD is still unclear. AIM: To analyze the levels of specific immunoglobulin G (IgG) and E (IgE) antibodies against food antigens in IBD patients and to determine their clinical value in the pathogenesis of IBD. METHODS We performed a retrospective study based on patients who visited the First Affiliated Hospital of Nanjing Medical University between August 2016 and January 2018. A total of 137 IBD patients, including 40 patients with ulcerative colitis (UC) and 97 patients with Crohn's disease (CD), and 50 healthy controls (HCs), were recruited. Serum food-specific IgG antibodies were detected by semi-quantitative enzyme-linked immunosorbent assay, and serum food-specific IgE antibodies were measured by Western blot. The value of food-specific IgG antibodies was compared among different groups, and potent factors related to these antibodies were explored by binary logistic regression. RESULTS Food-specific IgG antibodies were detected in 57.5% of UC patients, in 90.72% of CD patients and in 42% of HCs. A significantly high prevalence and titer of food-specific IgG antibodies were observed in CD patients compared to UC patients and HCs. The number of IgG-positive foods was greater in CD and UC patients than in HCs (CD vs HCs, P = 0.000; UC vs HCs, P = 0.029). The top five food antigens that caused positive specific IgG antibodies in CD patients were tomato (80.68%), corn (69.32%), egg (63.64%), rice (61.36%), and soybean (46.59%). The foods that caused positive specific IgG antibodies in UC patients were egg (60.87%), corn (47.83%), tomato (47.83%), rice (26.09%), and soybean (21.74%). Significantly higher levels of total food-specific IgG were detected in IBD patients treated with anti-TNFα therapy compared to patients receiving steroids and immunosuppressants (anti-TNFα vs steroids, P = 0.000; anti-TNFα vs immunosuppressants, P = 0.000; anti-TNFα vs steroids + immunosuppressants, P = 0.003). A decrease in food-specific IgG levels was detected in IBD patients after receiving anti-TNFα therapy (P = 0.007). Patients who smoked and CD patients were prone to developing serum food-specific IgG antibodies [Smoke: OR (95%CI): 17.6 (1.91-162.26), P = 0.011; CD patients: OR (95%CI): 12.48 (3.45-45.09), P = 0.000]. There was no difference in the prevalence of food-specific IgE antibodies among CD patients (57.1%), UC patients (65.2%) and HCs (60%) (P = 0.831). CONCLUSION CD patients have a higher prevalence of food-specific IgG antibodies than UC patients and HCs. IBD patients are prone to rice, corn, tomato and soybean intolerance. Smoking may be a risk factor in the occurrence of food-specific IgG antibodies. Food-specific IgG antibodies may be a potential method in the diagnosis and management of food intolerance in IBD.
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A Systematic Review of Organic Versus Conventional Food Consumption: Is There a Measurable Benefit on Human Health?
Vigar, V, Myers, S, Oliver, C, Arellano, J, Robinson, S, Leifert, C
Nutrients. 2019;12(1)
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The demand for organic products has risen rapidly over the last decades. The reasons why consumers may favour organic over conventional products are varied. They may be for personal health and wellbeing, environmental considerations, animal welfare or perceived higher nutritional profile - which is true for some, but not all components. While the long-term safety of pesticide consumption through conventional food production has been questioned, organic foods clearly show lower levels of toxic metabolites, like heavy metals and synthetic fertilizer and pesticide residues. This systematic review aimed to assess the current evidence of organic diet consumption and human health compared to conventionally produced foods. Included were 35 papers on clinical trials and observational studies. The clinical trials studied pesticide and phytochemical excretion, antioxidant capacity, body composition, lipids and inflammatory markers. The observational studies were focused on fertility, foetal and childhood development, pregnancy, lactation and levels of pesticides in children and adults, as well as nutritional biomarkers and cancer risk in adults. An increased intake of organic produce in long-term studies appeared to reduce the incidence of infertility, birth defects, allergies, middle ear infection, pre-eclampsia, metabolic syndrome, high BMI, and non-Hodgkin lymphoma. Organic intake was also linked to reduced urinary levels of organophosphorus pesticides and herbicides. Yet, the author highlighted that organic consumers are more likely to be health conscious, physically active, eat a more plant-based diet, have higher education levels and income, and therefore are not representative of the general population. They also argue that the possible benefits from an organic diet may be partially due to the quality and composition of the diet rather than a direct effect of organic food consumption. Whereby a growing number of findings demonstrate the health benefits of organic food consumption, according to the authors, the current evidence does not yield a solid and definitive answer.
Abstract
The current review aims to systematically assess the evidence related to human health outcomes when an organic diet is consumed in comparison to its conventional counterpart. Relevant databases were searched for articles published to January 2019. Clinical trials and observational research studies were included where they provided comparative results on direct or indirect health outcomes. Thirty-five papers met the criteria for inclusion in the review. Few clinical trials assessed direct improvements in health outcomes associated with organic food consumption; most assessed either differences in pesticide exposure or other indirect measures. Significant positive outcomes were seen in longitudinal studies where increased organic intake was associated with reduced incidence of infertility, birth defects, allergic sensitisation, otitis media, pre-eclampsia, metabolic syndrome, high BMI, and non-Hodgkin lymphoma. The current evidence base does not allow a definitive statement on the health benefits of organic dietary intake. However, a growing number of important findings are being reported from observational research linking demonstrable health benefits with organic food consumption. Future clinical research should focus on using long-term whole-diet substitution with certified organic interventions as this approach is more likely to determine whether or not true measurable health benefits exist.
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Exposure to glyphosate-based herbicides and risk for non-Hodgkin lymphoma: A meta-analysis and supporting evidence.
Zhang, L, Rana, I, Shaffer, RM, Taioli, E, Sheppard, L
Mutation research. Reviews in mutation research. 2019;781:186-206
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Glyphosate is a highly effective broad-spectrum herbicide that is typically applied in mixtures known as glyphosate-based herbicides (GBHs). Glyphosate and its metabolites persist in food, water, and dust, potentially indicating that everyone may be exposed ubiquitously. The objective of this study was to focus on an a priori hypothesis - the highest biologically relevant exposure to GBHs, i.e., higher levels, longer durations and/or with sufficient lag and latency, will lead to increased risk of non-Hodgkin lymphoma (NHL) in humans. This study is a meta-analysis of six studies (one cohort and five case-control control studies) with almost 65,000 participants. Results demonstrated a significantly increased NHL risk in highly GBH-exposed individuals. Authors conclude that the overall evidence from human, animal, and mechanistic studies presented in this study, supports a compelling link between exposures to GBHs and increased risk for NHL.
Abstract
Glyphosate is the most widely used broad-spectrum systemic herbicide in the world. Recent evaluations of the carcinogenic potential of glyphosate-based herbicides (GBHs) by various regional, national, and international agencies have engendered controversy. We investigated whether there was an association between high cumulative exposures to GBHs and increased risk of non-Hodgkin lymphoma (NHL) in humans. We conducted a new meta-analysis that includes the most recent update of the Agricultural Health Study (AHS) cohort published in 2018 along with five case-control studies. Using the highest exposure groups when available in each study, we report the overall meta-relative risk (meta-RR) of NHL in GBH-exposed individuals was increased by 41% (meta-RR = 1.41, 95% confidence interval, CI: 1.13-1.75). For comparison, we also performed a secondary meta-analysis using high-exposure groups with the earlier AHS (2005), and we calculated a meta-RR for NHL of 1.45 (95% CI: 1.11-1.91), which was higher than the meta-RRs reported previously. Multiple sensitivity tests conducted to assess the validity of our findings did not reveal meaningful differences from our primary estimated meta-RR. To contextualize our findings of an increased NHL risk in individuals with high GBH exposure, we reviewed publicly available animal and mechanistic studies related to lymphoma. We documented further support from studies of malignant lymphoma incidence in mice treated with pure glyphosate, as well as potential links between glyphosate / GBH exposure and immunosuppression, endocrine disruption, and genetic alterations that are commonly associated with NHL or lymphomagenesis. Overall, in accordance with findings from experimental animal and mechanistic studies, our current meta-analysis of human epidemiological studies suggests a compelling link between exposures to GBHs and increased risk for NHL.
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Key Risk Factors Affecting Farmers' Mental Health: A Systematic Review.
Daghagh Yazd, S, Wheeler, SA, Zuo, A
International journal of environmental research and public health. 2019;16(23)
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The prevalence of psychological stress among farmers and farm workers is greater than that of non-farmers. The mental health of farmers can be affected by several factors, including pesticide exposure, financial problems, climate issues, and poor physical health. A total of 167 studies are included in this systematic review incorporating data from the studies conducted in 34 countries, including the United Kingdom, the United States and Australia. There is a need for risk assessment that influences farmers' mental health, according to this systematic review. There is a need for more robust studies to evaluate the impact of climate change and pesticide exposure on farmers' mental health and to determine which strategies can be used to help them find therapies. Using the results of this systematic review, healthcare professionals can raise awareness about mental health issues and assist farmers in identifying the symptoms, allowing them to seek help.
Abstract
Recently, concern has increased globally over farmers' mental health issues. We present a systematic review of the outcomes, locations, study designs, and methods of current studies on farmers' mental health. In particular, this review aims to fill an important gap in understanding of the potential key risk factors affecting farmers' mental health around the world. 167 articles on farmer mental health were included in a final systematic review using a standardized electronic literature search strategy and PRISMA guidelines. The four most-cited influences on farmers' mental health in the reviewed literature respectively were pesticide exposure, financial difficulties, climate variabilities/drought, and poor physical health/past injuries. The majority of studies were from developed countries, most specifically from the United States, Australia, and the United Kingdom. Comparative studies on the mental health of farmers and other occupational workers showed mixed results, with a larger portion identifying that psychological health disturbances were more common in farmers and farm-workers. Knowledge of farmer psychological disorder risk factors and its impacts are essential for reducing the burden of mental illness. Further research will be required on climate change impacts, developing country farmers' mental health, and information on how to reduce help-seeking barriers amongst farmers.
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Occupational Exposures and Neurodegenerative Diseases-A Systematic Literature Review and Meta-Analyses.
Gunnarsson, LG, Bodin, L
International journal of environmental research and public health. 2019;16(3)
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Parkinson’s disease, amyotrophic lateral sclerosis (ALS) and Alzheimer’s disease are the most common neurodegenerative disorders. They primarily affect ageing individuals and are characterized by a steady progressive course because of increasing loss of specific neurons in the brain. The aim of this study was to assess neurodegenerative diseases in relation to main occupational exposures and investigate the possibility of publication bias. This study is a systematic review and meta-analysis of sixteen studies. Results show that exposure to pesticides brought about at least 50% increased risk for contracting the neurodegenerative diseases Parkinson’s disease, Alzheimer’s, or ALS. Exposure to lead involved at least a significant risk for ALS and Parkinson’s disease while non-lead exposures did not seem to involve risk. Furthermore, occupational exposure to electromagnetic fields may increase by 10% the risk for ALS and Alzheimer’s disease.
Abstract
Objectives: To carry out an integrated and stratified meta-analysis on occupational exposure to electromagnetic fields (EMFs), metals and pesticides and its effects on amyotrophic lateral sclerosis (ALS) and Parkinson's and Alzheimer's disease, and investigate the possibility of publication bias. Methods: In the current study, we updated our recently published meta-analyses on occupational exposures in relation to ALS, Alzheimer's and Parkinson's disease. Based on 66 original publications of good scientific epidemiological standard, according to the Meta-analysis of Observational Studies in Epidemiology (MOOSE) and the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) guidelines, we analysed subgroups by carrying out stratified meta-analyses on publication year, statistical precision of the relative risk (RR) estimates, inspection of the funnel plots and test of bias. Results: Based on 19 studies the weighted RR for occupational exposure to EMFs was 1.26 (95% confidence interval (CI) 1.07⁻1.50) for ALS, 1.33 (95% CI 1.07⁻1.64) for Alzheimer's disease and 1.02 (95% CI 0.83⁻1.26) for Parkinson's disease. Thirty-one studies concerned occupational exposure to pesticides and the weighted RR was 1.35 (95% CI 1.02⁻1.79) for ALS, 1.50 (95% CI 0.98⁻2.29) for Alzheimer's disease and 1.66 (95% CI 1.42⁻1.94) for Parkinson's disease. Finally, 14 studies concerned occupational exposure to metals and only exposure to lead (five studies) involved an elevated risk for ALS or Parkinson's disease and the weighted RR was 1.57 (95% CI 1.11⁻2.20). The weighted RR for all the non-lead exposures was 0.97 (95% CI 0.88⁻1.06). Conclusions: Exposure to pesticides increased the risk of getting the mentioned neurodegenerative diseases by at least 50%. Exposure to lead was only studied for ALS and Parkinson's disease and involved 50% increased risk. Occupational exposure to EMFs seemed to involve some 10% increase in risk for ALS and Alzheimer's disease only.