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Examining the Association between Coffee Intake and the Risk of Developing Irritable Bowel Syndrome: A Systematic Review and Meta-Analysis.
Lee, JY, Yau, CY, Loh, CYL, Lim, WS, Teoh, SE, Yau, CE, Ong, C, Thumboo, J, Namasivayam, VSO, Ng, QX
Nutrients. 2023;15(22)
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Irritable bowel syndrome (IBS) is a highly prevalent disorder of brain–gut interaction with a significant impact on quality of life and social functioning. Diet has been implicated in the pathophysiology of IBS as well as disease flares. A significant proportion of IBS patients experience food-related symptoms associated with consuming or eliminating certain foods. This study's aim was to determine if there is an association between coffee intake and the likelihood of developing IBS. This study was a systematic review and meta-analysis of eight studies with 432,022 participants. Results showed that coffee drinkers (any intake) may have a decreased risk of developing IBS compared to controls. However, these findings must be interpreted in light of several shortcomings. Authors concluded that future studies should (1) prioritise high-quality prospective cohort studies with well-documented coffee consumption (and exposure) and track the development of incident IBS in previously healthy individuals over time, and (2) investigate biological mechanisms.
Abstract
Irritable bowel syndrome (IBS) is a highly prevalent disorder of brain-gut interaction with a significant impact on quality of life. Coffee is a widely consumed beverage with numerous bioactive compounds that have potential effects on human health and disease states. Current studies on the effect of regular coffee consumption on the risk of developing IBS symptoms have yielded conflicting results. This systematic review and meta-analysis aimed to determine whether coffee intake is associated with developing IBS. A systematic literature search was performed in three electronic databases, namely PubMed, EMBASE, and The Cochrane Library, from inception until 31 March 2023. All original studies reporting associations between coffee intake and IBS were considered for inclusion. Odds ratios (ORs) were calculated for each study, and estimates were pooled, and where appropriate, 95% confidence intervals (95% CI) and p-values were calculated. Eight studies comprising 432,022 patients were included in the final meta-analysis. Using a fixed-effects model, coffee drinkers (any intake) had a reduced likelihood of developing IBS compared to controls, with a pooled OR of 0.84 (95% CI: 0.80 to 0.84). Sensitivity analysis confirmed the stability of the estimates. Future research should prioritise prospective cohort studies that are robust and closely track the development of incident IBS in previously healthy individuals.
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Mediterranean Diet-Based Interventions to Improve Anthropometric and Obesity Indicators in Children and Adolescents: A Systematic Review with Meta-Analysis of Randomized Controlled Trials.
López-Gil, JF, García-Hermoso, A, Sotos-Prieto, M, Cavero-Redondo, I, Martínez-Vizcaíno, V, Kales, SN
Advances in nutrition (Bethesda, Md.). 2023;14(4):858-869
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Globally, excess weight (overweight or obesity) in childhood represents a major public health threat, especially in Europe. Among healthy dietary patterns, the Mediterranean diet (MedDiet) has been recognised worldwide due to its distinctive health benefits. The aim of this study was to evaluate the effects of MedDiet-based interventions on anthropometric and obesity indicators among children and adolescents. This study was a systematic review and meta-analysis of fifteen randomised controlled trials. The studies included a total of 7184 participants (intervention groups: n = 3356) aged between 3 and 18 years. Results showed that the MedDiet-based interventions in a trial setting can be safely conducted in children and adolescents. In fact, the MedDiet-based interventions decreased body mass index and the percentage of obesity in children and adolescents. Authors conclude that their findings highlight the efficacy of MedDiet-based interventions as a useful tool in reversing the high prevalence of obesity.
Abstract
To our knowledge, no systematic review with meta-analysis has separately synthesized the effects of Mediterranean diet-based interventions in children and adolescents in relation to the effects on anthropometric measures. A better understanding of the effects of Mediterranean diet-based interventions on anthropometric variables could facilitate their implementation in efforts to prevent obesity in the young population. The aim of the present meta-analysis was to evaluate the effects of Mediterranean diet-based interventions on anthropometric and obesity indicators among children and adolescents. Four databases were systematically searched (PubMed, Scopus, Web of Science, and Cochrane Database of Systematic Reviews), including all studies up until 15 March, 2023. Eligible articles were randomized controlled trials measuring the effect of an intervention based on the promotion of the Mediterranean diet and obesity-associated parameters. The effect size of each study was estimated by Cohen's d for continuous variables or risk difference for categorical variables. Compared to the control group, the Mediterranean diet-based interventions showed small and significant reductions in body mass index (d = -0.14; 95% CI: -0.26, -0.01; I2 = 77.52%). Participants in the Mediterranean diet-based interventions had a significant reduction in the percentage of obesity (risk difference = 0.12; 95% CI: 0.01, 0.23; I2 = 84.56%) in comparison with the control group. Interventions had greater effects when aiming at participants with excess weight (that is, overweight or obesity), both for body mass index, waist circumference, waist-to-height ratio, percentage of obesity, and percentage of abdominal obesity. Mediterranean diet-based interventions have a significant effect on reducing the body mass index as well as reducing obesity in children and adolescents (aged 3-18 y). This trial was registered at PROSPERO as CRD42023386789.
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The effects of olive leaf extract on cardiovascular risk factors in the general adult population: a systematic review and meta-analysis of randomized controlled trials.
Razmpoosh, E, Abdollahi, S, Mousavirad, M, Clark, CCT, Soltani, S
Diabetology & metabolic syndrome. 2022;14(1):151
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Modifiable unhealthy behaviours, such as sedentary lifestyle, smoking, and unhealthy food habits, are regarded as important contributors to the widespread prevalence of cardiovascular diseases (CVDs), which occur concurrently in overweight/obesity, hypertension, dyslipidaemia, hyperglycaemia, and inflammation. The aim of this study was to investigate whether olive leaf extract (OLE) could improve the major cardiovascular-related variables, including lipid profile, glucose haemostasis, blood pressure, as well as liver/kidney and inflammatory markers in the general adult population. This study is a systematic review and meta-analysis of twelve randomised controlled studies. Results show that OLE supplementation: - significantly decreased triglycerides and systolic blood pressure levels. - only had short-term positive effects on blood pressure and lipid profiles, which may be attributed to the active constituents in OLE. - had more profitable effects on the improvement of triglycerides, blood pressure, total cholesterol and low-density lipoprotein cholesterol measures among participants with hypertension and individuals with normal body weight. Authors conclude that stronger randomised controlled trial investigations, assessing different doses and durations of OLE, are required to better elucidate the effects of OLE supplementation.
Abstract
BACKGROUND The aim of this systematic review and meta-analysis was to determine the effect of olive leaf extract (OLE) supplementation on cardiovascular-related variables, including lipid, glycemic, inflammatory, liver and renal-related factors, as well as blood pressure. METHODS PubMed, ISI Web of Science, Scopus, and Cochrane library were searched, up to October 2021, for relevant controlled trials. Mean differences and standard deviations were pooled for all outcomes, using a random-effects model. The methodological quality, as well as quality of evidence were assessed using standard tools. RESULTS Twelve studies (n = 819 participants) were included in our analyses. Overall analyses showed that OLE supplementation significantly decreased triglyceride (TG) levels (WMD = - 9.51 mg/dl, 95% CI - 17.83, - 1.18; P = 0.025; I2 = 68.7%; P-heterogeneity = 0.004), and systolic blood pressure (SBP) (WMD = - 3.86 mmHg, 95% CI - 6.44, - 1.28 mmHg; P = 0.003; I2 = 19.9%; P-heterogeneity = 0.28). Subgroup analyses also revealed a significant improvement in SBP (- 4.81 mmHg) and diastolic blood pressure (- 2.45 mmHg), TG (- 14.42 mg/dl), total cholesterol (TC) (- 9.14 mg/dl), and low-density lipoprotein-C (LDL-C) (- 4.6 mg/dl) measurements, in patients with hypertension. Significant reductions were also observed in TC (- 6.69 mg/dl), TG (- 9.21 mg/dl), and SBP (- 7.05 mmHg) in normal-weight individuals. However, no meaningful changes were seen in glucose hemostasis, liver and kidney, or inflammatory markers. CONCLUSION The present study revealed that supplementation with OLE yielded beneficial effects for blood pressure and lipid profile in adults, especially in patients with hypertension. As the quality of evidence for glucose hemostasis variables, liver, kidney, and inflammatory markers, were low-to-very low, higher quality RCTs may impact the overarching results. This study was registered at PROSPERO with the code CRD42022302395.
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Ultra-Processed Food Consumption and Mental Health: A Systematic Review and Meta-Analysis of Observational Studies.
Lane, MM, Gamage, E, Travica, N, Dissanayaka, T, Ashtree, DN, Gauci, S, Lotfaliany, M, O'Neil, A, Jacka, FN, Marx, W
Nutrients. 2022;14(13)
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Poor dietary quality is well established as a potentially modifiable risk factor for mental disorders. The NOVA food classification system was recently developed to enable the categorisation of food items based on distinctive levels of processing. The aim of this study was to synthesise and provide quantitative analyses of the most up-to-date evidence assessing associations between consumption of ultra-processed food, as defined by the NOVA food classification system, and mental disorders. This study is systematic review and meta-analysis of 17 studies with a total of 385,541 participants. The studies were 15 cross-sectional and 2 prospectively designed studies. Results show that ultra-processed food consumption is bidirectionally associated with adverse mental health. In fact, greater intake of ultra-processed food was associated with increased odds of depressive and anxiety symptoms, both when these outcomes were assessed together as well as separately. Authors conclude that further prospective and experimental studies are required to better determine directionality and causality and ensure that global preventative and treatment strategies are efficacious and appropriate.
Abstract
Since previous meta-analyses, which were limited only to depression and by a small number of studies available for inclusion at the time of publication, several additional studies have been published assessing the link between ultra-processed food consumption and depression as well as other mental disorders. We aimed to build on previously conducted reviews to synthesise and meta-analyse the contemporary evidence base and clarify the associations between the consumption of ultra-processed food and mental disorders. A total of 17 observational studies were included (n = 385,541); 15 cross-sectional and 2 prospective. Greater ultra-processed food consumption was cross-sectionally associated with increased odds of depressive and anxiety symptoms, both when these outcomes were assessed together (common mental disorder symptoms odds ratio: 1.53, 95%CI 1.43 to 1.63) as well as separately (depressive symptoms odds ratio: 1.44, 95%CI 1.14 to 1.82; and, anxiety symptoms odds ratio: 1.48, 95%CI 1.37 to 1.59). Furthermore, a meta-analysis of prospective studies demonstrated that greater ultra-processed food intake was associated with increased risk of subsequent depression (hazard ratio: 1.22, 95%CI 1.16 to 1.28). While we found evidence for associations between ultra-processed food consumption and adverse mental health, further rigorously designed prospective and experimental studies are needed to better understand causal pathways.
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Dietary supplements in neurological diseases and brain aging.
Naureen, Z, Dhuli, K, Medori, MC, Caruso, P, Manganotti, P, Chiurazzi, P, Bertelli, M
Journal of preventive medicine and hygiene. 2022;63(2 Suppl 3):E174-E188
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The rate of neurodegenerative diseases (ND) is increasing at a concerning rate. The condition is characterized by the progressive decline of neuron function in the brain, eventually leading to cognitive impairment and motorneuron disorders. This process appears to be mediated by the complex interplay of factors. The brain is extremely sensitive to oxidative stress, and oxidative stress and inflammation of the nervous tissue appear to be a common denominator in all neurodegenerative diseases. One of the challenges of ND for prevention as well as treatment and treatment development, is that the initial disease progression usually goes unnoticed, with symptoms only becoming apparent in the more advanced stages when irreversible damage has occurred. Diet quality has a significant impact on brain health and hence can also influence ND development. For example, the Mediterranean diet (MedDiet) has demonstrated many valuable attributes that can reduce ND incidences and improve cognitive function. This review looked at dietary components, natural compounds and medicinal plants that have shown to be beneficial for brain health in ND. The authors discussed the MedDiet followed by a brief review of dietary supplements, including N-acetylcysteine (NAC), phospholipids (Phosphatidylserine, Phosphatidylcholine), Gamma-aminobutyric acid, melatonin, omega-3 fatty acids, neurotropic vitamin B (B1, B6 and B12), S-adenosyl methionine (SAMe), the amino acid tryptophan, magnesium and various polyphenols. Several medicinal plants are reviewed that have demonstrated positive effects on preventing or alleviating neurological diseases. This includes Withania somnifera (Ashwagandha), Baccopa monnieri (Brahmi), Acorus calamus (Calamus) and Hypericum perforatum (St. Johns Wort). The review concluded that many bioactive compounds and plant constituents that can be obtained from a qualitative diet, as well as certain medicinal plants and supplements, can help preserve and promote brain health and prevent the onset of ND. Large clinical trials are needed to assess their suitability for their wider use.
Abstract
A healthy diet shapes a healthy mind. Diet quality has a strong association with brain health. Diet influences the onset and consequences of neurological diseases, and dietary factors may influence mental health at individual and population level. The link between unhealthy diet, impaired cognitive function and neurodegenerative diseases indicates that adopting a healthy diet would ultimately afford prevention and management of neurological diseases and brain aging. Neurodegenerative diseases are of multifactorial origin and result in progressive loss of neuronal function in the brain, leading to cognitive impairment and motoneuron disorders. The so-called Mediterranean diet (MedDiet) with its healthy ingredients rich in antioxidant, anti-inflammatory, immune, neuroprotective, antidepressant, antistress and senolytic activity plays an essential role in the prevention and management of neurological diseases and inhibits cognitive decline in neurodegenerative diseases such as Alzheimer's, Parkinson's and Huntington's diseases. The MedDiet also modulates the gut-brain axis by promoting a diversity of gut microbiota. In view of the importance of diet in neurological diseases management, this review focuses on the dietary components, natural compounds and medicinal plants that have proven beneficial in neurological diseases and for brain health. Among them, polyphenols, omega-3 fatty acids, B vitamins and several ayurvedic herbs have promising beneficial effects.
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The Role of Diet Quality in Mediating the Association between Ultra-Processed Food Intake, Obesity and Health-Related Outcomes: A Review of Prospective Cohort Studies.
Dicken, SJ, Batterham, RL
Nutrients. 2021;14(1)
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Diet has long been a cornerstone of weight management, with dietary policies being a core feature of government and health organisation strategies to reduce obesity worldwide. Indeed, poor diets are a leading cause of preventable obesity-related death and non-communicable diseases, including cancer, cardiovascular disease and type 2 diabetes. The aim of this study was to provide novel insights into the relative impact of nutrient content and dietary patterns vs. ultra-processing on obesity and adverse health-related outcomes. This study is a review of prospective cohort studies. Findings show that adjustment for fat, sugar and sodium intake, or adjustment for adherence to a range of healthy or unhealthy dietary patterns has a minimal impact on the adverse associations between UPF intake and a diverse range of health-related outcomes. Authors conclude that their findings raise important questions regarding current policy and future research needs, suggesting that the nature and extent of processing is an important dietary dimension.
Abstract
Prospective cohort studies show that higher intakes of ultra-processed food (UPF) increase the risk of obesity and obesity-related outcomes, including cardiovascular disease, cancer and type 2 diabetes. Whether ultra-processing itself is detrimental, or whether UPFs just have a lower nutritional quality, is debated. Higher UPF intakes are inversely associated with fruit, vegetables, legumes and seafood consumption. Therefore, the association between UPFs and poor health could simply be from excess nutrient intake or from a less healthful dietary pattern. If so, adjustment for dietary quality or pattern should explain or greatly reduce the size of the significant associations between UPFs and health-related outcomes. Here, we provide an overview of the literature and by using a novel approach, review the relative impact of adjusting for diet quality/patterns on the reported associations between UPF intake and health-related outcomes in prospective cohort studies. We find that the majority of the associations between UPFs, obesity and health-related outcomes remain significant and unchanged in magnitude after adjustment for diet quality or pattern. Our findings suggest that the adverse consequences of UPFs are independent of dietary quality or pattern, questioning the utility of reformulation to mitigate against the obesity pandemic and wider negative health outcomes of UPFs.
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Gut Microbiome and Depression: How Microbes Affect the Way We Think.
Limbana, T, Khan, F, Eskander, N
Cureus. 2020;12(8):e9966
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Recent findings have shown that a healthy gut microflora transmits signals to the brain through various pathways, namely the gut-brain axis. With the gut and brain working in a bidirectional relationship, emerging research suggests this could potentially impact stress, anxiety, depression and cognition. Therefore the aim of this review was to determine the role of the gut microbiome in mental health and depression. A total of 26 articles were reviewed and based on these articles, a strong link exists between the gut microbiome and its impact on mental health. Additionally, the literature supports the notion that the gut-brain axis serves as an essential pathway. Based on these findings, the authors agree there is a strong association between the gut microbiome and mental health, while also acknowledging the need to establish a causal link between these two entities. The authors conclude that the microbiome is a promising approach when considering the prevention, treatment and management of mental health diseases in the future.
Abstract
The gut microbiome serves an important role in the human body. Reportedly, one of the benefits of these microflora is on mental health. Once established, food and other dietary sources that enhance quality microbiome content in our gastrointestinal system will be a significant consideration in individuals' day to day lives. This literature review conducted a PubMed search for studies about the gut microbiome and its relation to depression. In using several Medical Subject Heading (MeSH) keywords, relevant literature was selected. A total of 26 articles were selected after applying the inclusion and exclusion criteria, and after checking the articles' accessibility. This literature would like to establish the role of the gut microbiome in depression. This study's findings showed that there is a strong association of microbiome function to mental well-being.
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COVID-19: The Inflammation Link and the Role of Nutrition in Potential Mitigation.
Zabetakis, I, Lordan, R, Norton, C, Tsoupras, A
Nutrients. 2020;12(5)
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By May 2020, the novel coronoavirus COVID-19 had infected over 4 million people worldwide. Spread through droplet, it gains entry to body cells through ACE2 cell receptors, causing viral infection-related inflammation, and predominantly infects the lower respiratory tract. Those with non-communicable diseases with COVID-19 experience increased inflammation and have a higher risk of adverse outcomes and mortality. This review article gives details of the mechanisms involved in a cytokine storm (an uncontrolled inflammatory response) and current treatment options, before discussing the immune-balancing and anti-inflammatory potential of healthy nutrition in reducing susceptibility to developing infections. Nutrition Practitioners looking to support the immunity and inflammation of their clients will find the summary research presented in relation to dietary strategies, different food groups and nutrients a useful basis for further study.
Abstract
The novel coronavirus disease (COVID-19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has engulfed the world, affecting more than 180 countries. As a result, there has been considerable economic distress globally and a significant loss of life. Sadly, the vulnerable and immunocompromised in our societies seem to be more susceptible to severe COVID-19 complications. Global public health bodies and governments have ignited strategies and issued advisories on various handwashing and hygiene guidelines, social distancing strategies, and, in the most extreme cases, some countries have adopted "stay in place" or lockdown protocols to prevent COVID-19 spread. Notably, there are several significant risk factors for severe COVID-19 infection. These include the presence of poor nutritional status and pre-existing noncommunicable diseases (NCDs) such as diabetes mellitus, chronic lung diseases, cardiovascular diseases (CVD), obesity, and various other diseases that render the patient immunocompromised. These diseases are characterized by systemic inflammation, which may be a common feature of these NCDs, affecting patient outcomes against COVID-19. In this review, we discuss some of the anti-inflammatory therapies that are currently under investigation intended to dampen the cytokine storm of severe COVID-19 infections. Furthermore, nutritional status and the role of diet and lifestyle is considered, as it is known to affect patient outcomes in other severe infections and may play a role in COVID-19 infection. This review speculates the importance of nutrition as a mitigation strategy to support immune function amid the COVID-19 pandemic, identifying food groups and key nutrients of importance that may affect the outcomes of respiratory infections.
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You Are What You Eat-The Relationship between Diet, Microbiota, and Metabolic Disorders-A Review.
Moszak, M, Szulińska, M, Bogdański, P
Nutrients. 2020;12(4)
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The gut microbiota (GM) is a collection of microorganisms living in the digestive tract of humans, which if unbalanced, may have a role in the development of certain disorders such as type 2 diabetes and obesity. A number of factors can imbalance the gut microbiota, one of the main being diet. This review paper of 190 papers aimed to summarise the relationship between GM, diet and modifiable diseases such as type 2 diabetes and obesity. Dietary components and the role of carbohydrates, protein and fats in shaping the GM were discussed. It was determined that carbohydrates have the greatest influence, with simple carbohydrates such as the sugars fructose and sucrose having a negative impact and the more complex forms being beneficial. Diet types were also reviewed. Vegetarian and vegan diets appear to increase the diversity of the GM, the Mediterranean diet changes the species balance, and the Western diet imbalances the GM causing diseases such as heart disease. Interestingly the literature points towards a negative impact of the gluten free diet. Diseases such as type 2 diabetes, obesity and increased fats in the blood all display an imbalanced GM causing increased energy harvest from food and disruption of various energy pathways in the body. It was concluded that a balanced diet rich in fruit, vegetables, fibre and healthy fats can promote GM diversity and activity. This study could be used by health care professionals to understand the importance of certain dietary components to promote GM diversity in order to reduce the risk of diseases such as obesity and type 2 diabetes.
Abstract
The gut microbiota (GM) is defined as the community of microorganisms (bacteria, archaea, fungi, viruses) colonizing the gastrointestinal tract. GM regulates various metabolic pathways in the host, including those involved in energy homeostasis, glucose and lipid metabolism, and bile acid metabolism. The relationship between alterations in intestinal microbiota and diseases associated with civilization is well documented. GM dysbiosis is involved in the pathogenesis of diverse diseases, such as metabolic syndrome, cardiovascular diseases, celiac disease, inflammatory bowel disease, and neurological disorders. Multiple factors modulate the composition of the microbiota and how it physically functions, but one of the major factors triggering GM establishment is diet. In this paper, we reviewed the current knowledge about the relationship between nutrition, gut microbiota, and host metabolic status. We described how macronutrients (proteins, carbohydrates, fat) and different dietary patterns (e.g., Western-style diet, vegetarian diet, Mediterranean diet) interact with the composition and activity of GM, and how gut bacterial dysbiosis has an influence on metabolic disorders, such as obesity, type 2 diabetes, and hyperlipidemia.
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What is the best diet for cardiovascular wellness? A comparison of different nutritional models.
Migliaccio, S, Brasacchio, C, Pivari, F, Salzano, C, Barrea, L, Muscogiuri, G, Savastano, S, Colao, A
International journal of obesity supplements. 2020;10(1):50-61
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Cardiovascular disease (CVD) is the leading cause of death in developed countries. There are many studies linking unhealthy nutrition and lifestyles to CVD, so there is a need to modify these factors. Different types of diet exist, or have been established, to optimise the approach such as the Mediterranean diet (MeDi), Dietary Approaches to Stop Hypertension diet (DASH), vegetarian diet, ketogenic diet, and Japanese diet. This review looks at the aspects of the diets. It evaluates the factors that increase CVD risk and the potential application and benefits of nutritional protocols. The diets are discussed along with factors such as energy excess, saturated fat intake, free sugars and refined starches intake, dietary fibre intake, fruit and vegetable intake, Polyunsaturated fatty acids (PUFA): omega-3, Monounsaturated fatty acids (MUFA), anthocyanins, vitamins and sedentary behaviour. The authors conclude that the MeDi has the best nutritional pattern. It includes whole grains, pulses, fiber and PUFAs without completely excluding food of animal origin such as meat, fish, dairy products, eggs, and limits alcohol consumption. The MeDi also includes conviviality and physical activity.
Abstract
Cardiovascular diseases (CVD) represent to date the leading cause of mortality in both genders in the developed countries. In this context, a strong need for CVD prevention is emerging through lifestyle modification and nutrition. In fact, several studies linked CVD with unhealthy nutrition, alcohol consumption, stress, and smoking, together with a low level of physical activity. Thus, the primary aim is to prevent and reduce CVD risk factors, such as impaired lipid and glycemic profiles, high blood pressure and obesity. Different types of diet have been, therefore, established to optimize the approach regarding this issue such as the Mediterranean diet, Dietary Approaches to Stop Hypertension diet (DASH), vegetarian diet, ketogenic diet, and Japanese diet. Depending on the diet type, recommendations generally emphasize subjects to increase vegetables, fruits, whole grains, and pulses consumption, but discourage or recommend eliminating red meat, sweets, and sugar-sweetened beverages, along with processed foods that are high in sugar, salt, fat, or low in dietary fiber. In particular, we evaluated and compared the peculiar aspects of these well-known dietary patterns and, thus, this review evaluates the critical factors that increase CVD risk and the potential application and benefits of nutritional protocols to ameliorate dietary and lifestyle patterns for CVD prevention.