If you're here because of the "drama", congratulations, I am too apparently. If you're also here with the position that a vegan diet is unhealthy in humans, I'm begging you for a toilet break's worth of your time. The contents of this post are wholly divorced from ethics or environmental concerns, are not here to "own you with facts and logic", and are focused solely on human health through the quoting of scientific literature. For as many of these as I can, I have provided links to the full text on the NCBI's PubMed Commons in the interest of transparency.

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• It is the position of the Academy of Nutrition and Dietetics that appropriately planned vegetarian, including vegan, diets are healthful, nutritionally adequate, and may provide health benefits for the prevention and treatment of certain diseases. These diets are appropriate for all stages of the life cycle, including pregnancy, lactation, infancy, childhood, adolescence, older adulthood, and for athletes [...] Low intake of saturated fat and high intakes of vegetables, fruits, whole grains, legumes, soy products, nuts, and seeds (all rich in fiber and phytochemicals) are characteristics of vegetarian and vegan diets that produce lower total and low-density lipoprotein cholesterol levels and better serum glucose control. These factors contribute to reduction of chronic disease. —Journal of the Academy of Nutrition and Dietetics (2016)

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• Based on this systematic review of randomized clinical trials, there is an overall robust support for beneficial effects of a plant-based diet on metabolic measures in health and disease. —Translational Psychiatry (2019)

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• In most countries a vegan diet has less energy and saturated fat compared to omnivorous control diets, and is associated with favourable cardiometabolic risk profile including lower body weight, LDL cholesterol, fasting blood glucose, blood pressure and triglycerides. —PLoS One meta-analysis (2018)

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• This comprehensive meta-analysis reports a significant protective effect of a vegetarian diet versus the incidence and/or mortality from ischemic heart disease (-25%) and incidence from total cancer (-8%). Vegan diet conferred a significant reduced risk (-15%) of incidence from total cancer. —Critical Reviews in Food Science and Nutrition (2017)

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• The present systematic review and meta-analysis showed a 15% and a 21% reduction in the relative risk of CVD and IHD, respectively, for vegetarians compared to nonvegetarians, but no clear association was observed for total stroke or subtypes of stroke. In addition, an 18% reduction in the relative risk of IHD was observed among vegans when compared to nonvegetarians, although this association was imprecise. —European Journal of Nutrition (2023)

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• Adequate intake of dietary fiber is associated with digestive health and reduced risk for heart disease, stroke, hypertension, certain gastrointestinal disorders, obesity, type 2 diabetes, and certain cancers. According to consumer research, the public is aware of the benefits of fiber and most people believe they consume enough fiber. However, national consumption surveys indicate that only about 5% of the population meets recommendations, and inadequate intakes have been called a public health concern [...] The IOM defines total fiber as the sum of dietary fiber and functional fiber. Dietary fiber includes nondigestible carbohydrates and lignins that are intrinsic and intact in plants; functional fiber includes isolated, nondigestible carbohydrates that have beneficial physiological effects in humans. Common sources of intrinsic fiber include grain products, vegetables, legumes, and fruit. —American Journal of Lifestyle Medicine (2017)

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• Consumption of vegetarian diets was associated with lower mean concentrations of total cholesterol (−29.2 and −12.5 mg/dL, P < 0.001), low-density lipoprotein cholesterol (−22.9 and −12.2 mg/dL, P < 0.001), and high-density lipoprotein cholesterol (−3.6 and −3.4 mg/dL, P < 0.001), compared with consumption of omnivorous diets in observational studies and clinical trials, respectively. —Nutrition Reviews (2017)

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• [R]ecommendations to increase fruit and vegetable consumption, while decreasing saturated fat and dairy intake, are supported [for asthma] by the current literature. Mediterranean and vegan diets emphasizing the consumption of fruits, vegetables, grains, and legumes, while reducing or eliminating animal products, might reduce the risk of asthma development and exacerbation. Fruit and vegetable intake has been associated with reduced asthma risk and better asthma control, while dairy consumption is associated with increased risk and might exacerbate asthmatic symptoms. —Nutrition Reviews (2020)

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• Over the past two decades, a substantial body of consistent evidence has emerged at the cellular and molecular level, elucidating the numerous benefits of a plant-based diet (PBD) for preventing and mitigating conditions such as atherosclerosis, chronic noncommunicable diseases, and metabolic syndrome. —Nutrients comprehensive review (2023)

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• Consumption of vegetarian diets, particularly vegan diets, is associated with lower levels of plasma lipids, which could offer individuals and healthcare professionals an effective option for reducing the risk of heart disease or other chronic conditions. —Nutrition Reviews systematic review and meta-analysis (2017)

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• After adjusting for basic demographic characteristics, medical specialty, and health behaviours (smoking, physical activity) in model 2, participants who followed plant-based diets had 73% lower odds of moderate-to-severe COVID-19 (OR 0.27, 95% CI 0.10 to 0.81) compared with participants who did not follow plant-based diets. Similarly, participants who followed either plant-based diets or pescatarian diets had 59% lower odds of moderate-to-severe COVID-19 (OR 0.41, 95% CI 0.17 to 0.99) compared with those who did not follow these diets. —British Medical Journal (2021)

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• Current research suggests that switching to a plant-based diet may help increase the diversity of health-promoting bacteria in the gut. However, more research is needed to describe the connections between nutrition, the microbiome, and health outcomes because of their complexity and individual heterogeneity. —Nutrients systematic review (2023)

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• [T]his systematic review shows that plant-based diets and their components might have the potential to improve cancer prognosis, especially for breast, colorectal and prostate cancer survivors. —Current Nutrition Reports (2022)

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• Moderate evidence suggests that adhering to vegan diets for at least 12 weeks may be effective in individuals with overweight or type 2 diabetes to induce a meaningful decrease in body weight and improve glycemia. —Obesity Reviews systematic review and meta-analysis (2022)

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• The data discussed in this systematic review allow us to conclude that plant-based diets are associated with lower BP and overall better health outcomes (namely, on the cardiovascular system) when compared with animal-based diets. —Current Hypertension Reports (2023)

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• There are multiple benefits of a vegan or vegetarian diet [six listed, too long to quote here] in the management of CKD [...] —Journal of Renal Nutrition (2019)

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• The present systematic review provides evidence that vegan and vegetarian diets are associated with lower CRP levels, a major marker of inflammation and a mediator of inflammatory processes. —Scientific Reports (2020)

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• Evidence strongly suggests that plant-based dietary patterns that are abundant in fruits, vegetables, nuts, seeds, legumes, and whole grains with less emphasis on animal foods and processed foods are a useful and a practical approach to preventing chronic diseases. Such dietary patterns, from plant-exclusive diets to plant-centered diets, are associated with improved long-term health outcomes and a lower risk of all-cause mortality. Given that neurodegenerative disorders share many pathophysiological mechanisms with CVD, including oxidative stress, inflammation, and vascular damage, it is reasonable to deduce that plant-based diets can ameliorate cognitive decline as well. —Advances in Nutrition (2019)

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• [T]he current study presents evidence that plant-based diets, among which the vegan diet, have no effect on physical performance, including on strength/power performance. It is noteworthy that aerobic performance may be even benefitted by these diets. —British Journal of Nutrition systematic review and meta-analysis (2024)

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• [H]igher adherence to plant-based dietary patterns, especially from healthy sources, may be universally beneficial for the primary prevention of T2D, CVD, cancer, and mortality. —Nutrition Journal systematic review and meta-analysis (2023)

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• This umbrella review offers valuable insights on the estimated reduction of risk factors for cardiometabolic diseases and cancer, and the CVDs-associated mortality, offered by the adoption of plant-based diets through pleiotropic mechanisms. Through the improvement of glycolipid profile, reduction of body weight/BMI, blood pressure, and systemic inflammation, A/AFPDs significantly reduce the risk of ischemic heart disease, gastrointestinal and prostate cancer, as well as related mortality. —PLoS One (2024)

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• In this community‐based cohort of US adults without cardiovascular disease at baseline, we found that higher adherence to an overall plant‐based diet or a provegetarian diet, diets that are higher in plant foods and lower in animal foods, was associated with a lower risk of incident cardiovascular disease, cardiovascular disease mortality, and all‐cause mortality. —Journal of the American Heart Association (2019)

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• In this meta-analysis of prospective observational studies, we found that greater adherence to a plant-based dietary patterns was inversely associated with the risk of type 2 diabetes. These findings were broadly consistent across subgroups defined by various population characteristics and robust in sensitivity analyses.—JAMA Internal Medicine (2019)

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• Our findings suggest that a shift in diet from a high consumption of animal-based foods, especially red and processed meat, to plant-based foods (e.g., nuts, legumes, and whole grains) is associated with a lower risk of all-cause mortality, CVD, and T2D. Thus, a change in dietary habits towards an increment of plant-based products appears to be important for cardiometabolic health. —BMC Medicine systematic review and meta-analysis (2023)

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• Not only is there a broad expansion of the research database supporting the myriad benefits of plant-based diets, but also health care practitioners are seeing awe-inspiring results with their patients across multiple unique subspecialties. Plant-based diets have been associated with lowering overall and ischemic heart disease mortality; supporting sustainable weight management; reducing medication needs; lowering the risk for most chronic diseases; decreasing the incidence and severity of high-risk conditions, including obesity, hypertension, hyperlipidemia, and hyperglycemia; and even possibly reversing advanced coronary artery disease and type 2 diabetes. —The Permanente Journal (2016)

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• It is the position of the Academy of Nutrition and Dietetics that, in adults, appropriately planned vegetarian and vegan dietary patterns can be nutritionally adequate and can offer long-term health benefits such as improving several health outcomes associated with cardiometabolic diseases. […] As leaders in evidence-based nutrition care, RDNs and NDTRs should aim to support the development and facilitation of vegetarian and vegan dietary patterns and access to nutrient-dense plant-based meals. Promoting a nutrient-balanced vegetarian dietary pattern on both individual and community scales may be an effective tool for preventing and managing many diet-related conditions. —Journal of the Academy of Nutrition and Dietetics (2025)