The complete, sourced guide to the benefits of a vegan & plant-based diet

Whole-food plant-based diets repeatedly lower HbA1c, reduce diabetes medication needs, and in many cases drive type 2 diabetes into remission.

• Barnard et al.'s landmark randomized trial showed a low-fat vegan diet improved glycemic and lipid control more than a conventional ADA diet in people with type 2 diabetes.
• In Adventist Health Study-2, vegans had roughly half the prevalence of type 2 diabetes compared with non-vegetarians, even after adjusting for BMI.
• A 2019 JAMA Internal Medicine meta-analysis of 9 cohorts (>300,000 people) found higher adherence to plant-based diets was linked to a 23% lower risk of type 2 diabetes; healthful plant-based diets cut risk by ~30%.
• Plant-based interventions improve beta-cell function and reduce insulin resistance independently of weight loss, partly by lowering intramyocellular lipid.

Sources: [2] [5] [4] [3] [6]

Replacing meat, dairy and refined foods with legumes, whole grains, vegetables and fruits improves insulin sensitivity and reverses metabolic syndrome features.

• A 16-week randomized trial (Kahleova 2018) showed a plant-based diet improved insulin resistance, fasting insulin and beta-cell function in overweight adults.
• High-fiber, low-glycemic plant foods blunt post-meal glucose spikes and reduce fasting insulin within weeks.
• Plant-based diets lower triglycerides, blood pressure and waist circumference — the defining components of metabolic syndrome.

Sources: [6] [21] [2]

Plant-based diets reliably lower LDL (the 'bad' cholesterol) and reduce cardiovascular events — and in landmark trials they reversed coronary artery disease.

• Meta-analyses show vegetarian and vegan diets lower total cholesterol by ~15 mg/dL and LDL by ~10–15 mg/dL vs. omnivorous diets.
• Dean Ornish's Lifestyle Heart Trial demonstrated angiographic regression of coronary atherosclerosis on a whole-food plant-based diet plus lifestyle changes.
• Esselstyn's nearly fat-free plant-based program reported cardiac event recurrence dropping from ~62% to under 1% in adherent patients.
• Eliminating dietary cholesterol (only present in animal products) and saturated fat from meat and dairy is the strongest dietary lever for LDL reduction.

Sources: [7] [8] [9]

Healthful plant-based diets are linked to lower prevalence of fatty liver and slower progression of NAFLD/NASH.

• A 2022 Hepatology cohort study found higher adherence to a healthful plant-based diet index was associated with significantly lower NAFLD risk.
• Replacing red and processed meats with legumes, nuts and whole grains reduces liver fat and ALT in clinical trials.
• Diets rich in soluble fiber, polyphenols and unsaturated plant fats improve insulin sensitivity — the central driver of NAFLD.

Sources: [11] [10]

The WHO classifies processed meat as a Group 1 carcinogen and red meat as Group 2A. Plant-forward diets reduce risk of multiple cancers.

• IARC concluded processed meat causes colorectal cancer and red meat probably causes colorectal, pancreatic and prostate cancers.
• The World Cancer Research Fund recommends eating mostly plants and limiting red meat to ≤350 g/week as core cancer-prevention guidance.
• EPIC-Oxford and Adventist Health Study-2 found vegetarians and vegans had lower overall cancer incidence vs. meat-eaters, especially for gastrointestinal cancers.
• Phytochemicals, fiber and antioxidants from whole plants reduce DNA damage and chronic inflammation — both drivers of carcinogenesis.

Sources: [12] [13] [14] [15]

Vegans have the lowest average BMI of any dietary pattern studied, and plant-based diets outperform conventional diets for weight loss in head-to-head trials.

• In EPIC-Oxford, vegans gained the least weight over 5 years across all diet groups.
• Turner-McGrievy's 6-month randomized comparison of vegan, vegetarian, pescatarian, semi-vegetarian and omnivorous diets found vegans lost the most weight.
• A meta-analysis of 12 RCTs (Barnard 2015) showed vegetarian diets produced ~2 kg greater weight loss than control diets without intentional calorie restriction.

Sources: [18] [19] [20]

Long-running cohort studies link plant-based eating to longer life — Loma Linda Adventists are one of the world's five Blue Zones.

• Adventist Health Study-2 reported lower all-cause mortality among vegetarians (HR 0.88) and vegans, with men gaining several extra years of life expectancy.
• A meta-analysis (Huang 2012) found vegetarian diets associated with ~25% lower ischemic heart disease mortality and ~8% lower cancer incidence.
• Replacing animal protein with plant protein is associated with lower mortality in multiple large prospective cohorts.

Sources: [15] [16] [17]

Well-planned plant-based diets meet — and often exceed — the needs of endurance and strength athletes, and may speed recovery thanks to lower inflammation and oxidative stress.

• Reviews in Nutrients conclude vegan and vegetarian diets can fully support performance when protein and key micronutrients are well planned.
• Plant-based diets improve arterial flexibility, blood flow and VO2max — directly relevant to endurance athletes.
• Higher antioxidant intake from fruits, vegetables, nuts and seeds reduces exercise-induced oxidative stress and may shorten recovery time.
• Pro athletes from tennis (Novak Djokovic), F1 (Lewis Hamilton) and ultra-running (Scott Jurek, Rich Roll) have publicly endorsed plant-based eating for performance.

Sources: [29] [30] [31] [32]

Diets rich in fruits, vegetables, whole grains, legumes, nuts and seeds are linked to better mood, lower depression risk and slower cognitive decline.

• A randomized trial in office workers (Beezhold & Johnston) showed restricting meat improved mood and reduced anxiety and stress over 2 weeks.
• Workplace plant-based interventions (Agarwal/GEICO trial) improved depression, anxiety, productivity and overall wellbeing scores.
• Plant-based eating patterns (MIND, Mediterranean) are associated with reduced risk of Alzheimer's disease and slower cognitive decline.

Sources: [23] [24] [22]

Antioxidant-rich, low-glycemic plant foods support clearer skin, stronger hair and slower glycation-driven skin aging.

• Low-glycemic-load diets — naturally easier on whole-food plant eaters — significantly improve acne in randomized trials.
• Reviews of medical nutrition therapy for acne cite dairy and high-glycemic loads as the most consistent dietary triggers.
• High intake of carotenoids and polyphenols from plants is linked to better skin tone, hydration and protection from UV-induced damage.
• Lower advanced glycation end-product (AGE) intake — meaningfully reduced on plant-based diets — is linked to less skin sagging and wrinkling.

Sources: [25] [26] [27] [28]

Plant-based diets lower blood pressure, reduce chronic inflammation markers (CRP, IL-6) and raise post-meal calorie burn.

• Meta-analyses show vegetarian/vegan diets reduce systolic blood pressure by ~5 mmHg and diastolic by ~2 mmHg vs. omnivorous diets.
• Plant-based interventions reduce CRP and other inflammatory cytokines compared with control diets.
• Diet-induced thermogenesis is meaningfully higher after plant-based meals than after isocaloric high-fat meat meals.

Sources: [9] [21] [6]

Animal agriculture is one of the largest drivers of greenhouse gas emissions, land use, water use and biodiversity loss. Going plant-based is the single biggest individual lever to shrink your footprint.

• Poore & Nemecek (Science, 2018): a plant-based diet can cut food-related greenhouse gases, land use and water use by up to 49–76% per person.
• Nature Food (Scarborough 2023): UK vegans' food emissions are 75% lower, land use 75% lower and water use 54% lower than high-meat eaters.
• FAO estimates livestock are responsible for ~14.5% of all human-induced greenhouse gas emissions.
• Producing 1 kg of beef requires ~15,000 L of water vs. ~300–500 L for vegetables and legumes (Mekonnen & Hoekstra).
• The EAT-Lancet Commission calls for a major global shift toward plant-based diets to stay within planetary boundaries.

Sources: [34] [37] [33] [35] [36]

More than 80 billion land animals and an estimated 1–3 trillion fish are killed for food each year. Choosing plant-based spares lives every week.

• UN FAO data (Our World in Data) put global land-animal slaughter above 80 billion per year; aquatic animal totals are even higher.
• The vast majority of farmed animals are raised in intensive systems documented to cause chronic stress, pain and suffering.
• Average lifetime savings of one vegan year: dozens of land animals and hundreds of fish, plus avoided dairy/egg industry harms.
• Compassion is a powerful, durable motivator — and pairing it with health and climate benefits makes plant-based eating a triple win.

Sources: [38] [39]

The Academy of Nutrition and Dietetics confirms well-planned vegetarian and vegan diets are healthful, nutritionally adequate and appropriate for all life stages — including pregnancy, childhood and athletes.

• Position paper (J Acad Nutr Diet, 2016): plant-based diets are appropriate for infancy, childhood, adolescence, pregnancy, lactation, older adults and athletes.
• Pay attention to vitamin B12 (supplement required), vitamin D, omega-3 (EPA/DHA from algae oil), iodine, iron, zinc, calcium and varied protein sources.
• Most adults easily meet protein needs from legumes, soy, whole grains, nuts and seeds.

Sources: [1] [40] [41] [42] [43]