PROT-AGE / ESPEN 2013 + EPIC-Oxford fracture data

Vegan and Vegetarian Older Adults: Sarcopenia and Protein Needs

Plant-based eating after 65 is well-supported by published evidence, but the priorities shift: protein needs go up, B12 absorption goes down, bone density becomes a more pressing concern, and energy density of meals matters more. This page works through the specific adjustments and the supplements that matter most for older vegans and vegetarians.

The short answer. Over 65s: 1.0 to 1.2 g protein per kg per day (1.2 to 1.5 with illness); B12 from supplements at 25 to 50 mcg daily (absorption from food-bound sources declines with age); vitamin D 10 to 25 mcg year-round; calcium 1,200 mg from fortified plant milks plus calcium-set tofu plus low-oxalate greens; resistance training 2 to 3 times per week; vitamin K2 (MK-7) worth considering at 90 to 180 mcg per day for bone density.

The protein and sarcopenia priority

Adult muscle mass peaks in the third decade, plateaus through the fourth and fifth, and then declines progressively. Typical mass loss is 3 to 5% per decade after 30, accelerating to about 8% per decade after 70 in sedentary adults. The clinical consequence is sarcopenia: reduced muscle mass and strength, which raises fall risk, fracture risk, recovery time after illness, and ultimately all-cause mortality. Sarcopenia is now recognised as a treatable condition with its own ICD-10 code (M62.84) since 2016.

The PROT-AGE Study Group (Bauer J et al., J Am Med Dir Assoc 2013; 14: 542-559), led by the European Society for Clinical Nutrition and Metabolism, reviewed the evidence base and recommended protein intake of 1.0 to 1.2 g per kg per day for healthy older adults, rising to 1.2 to 1.5 g per kg per day for older adults with acute or chronic illness, and even higher (up to 2.0 g per kg per day) during rehabilitation from major illness or surgery. The standard adult RDA of 0.8 g per kg per day was set on the basis of nitrogen balance studies in younger adults and is now considered inadequate for the elderly.

Vegan and vegetarian older adults should aim toward the upper end of these ranges to account for the modestly lower digestibility-corrected protein quality of plant foods. A 70 kg vegan over 65 therefore targets 84 to 105 g of protein per day. This is achievable with deliberate planning: 100 g tofu (8 g protein) + 1 cup lentils (18 g) + 100 g tempeh (19 g) + 30 g pea protein in a smoothie (24 g) + a small handful of nuts and seeds (8 g) + grains throughout the day (15 g) totals 92 g.

The exercise leg of the equation

Protein alone, without resistance loading, produces small improvements in muscle mass. The intervention with the best evidence in elderly sarcopenia (Cermak 2012 meta-analysis, Devries and Phillips 2015, others) is protein plus resistance exercise, where the protein supports synthesis stimulated by the loading. Standard prescriptions: progressive resistance training 2 to 3 times per week, hitting major muscle groups, 8 to 12 reps per set, 2 to 3 sets per exercise, progressing weight over time as tolerated.

For older adults new to resistance training, body-weight or resistance-band exercises under supervision are a safer starting point than free weights. Local gym chains, NHS-referred exercise schemes, and structured programmes like the UK Otago Exercise Programme (designed for falls prevention in over-65s) provide the right approach. Diet plus exercise compounds; either alone underperforms.

B12 with age

Parietal cells in the stomach produce hydrochloric acid and intrinsic factor. Both decline with age. Atrophic gastritis affects 20 to 30% of adults over 60. The result is a two-step problem: stomach acid is needed to release B12 from animal source food protein, and intrinsic factor is needed for B12 absorption in the ileum. Older vegetarians eating eggs and dairy can find that their B12 status drifts down even on adequate intake, because the protein-bound B12 release step is failing. Supplemental B12 (cyanocobalamin or methylcobalamin) is not protein-bound and bypasses the first step.

The Institute of Medicine recommends that everyone over 50 should obtain most of their B12 from fortified foods or supplements. For older vegetarians, this means routinely including fortified plant milks, fortified breakfast cereals, fortified nutritional yeast, or a daily supplement. For older vegans, this means moving the supplement dose upward: 25 to 50 mcg cyanocobalamin daily, rather than the 10 mcg typical for younger vegans. Annual serum B12 plus MMA testing is sensible.

Bone density priorities

The EPIC-Oxford 2020 fracture analysis by Tong and colleagues found vegans had 2.3x the hip fracture rate of meat-eaters, driven largely by lower BMI and lower calcium and protein intakes. Older vegans should systematically address all three. Calcium target 1,200 mg per day (US IOM target for women over 50 and men over 70) from fortified plant milks, calcium-set tofu, low-oxalate leafy greens (kale, bok choy, collards), almonds, tahini, and dried figs. Vitamin D at 10 to 25 mcg per day year-round.

Protein matters for bone density not just muscle; older studies suggesting high protein leached calcium have been superseded by isotope studies showing protein increases intestinal calcium absorption via IGF-1 signalling. Net calcium retention is similar or better on adequate-protein diets. Older vegans hitting 1.0 to 1.2 g/kg/day protein are doing both their muscles and bones a service.

Vitamin K2 (MK-7 form, 90 to 180 mcg per day) has supportive but not yet conclusive evidence for bone mineral density maintenance in older adults. The Knapen 2013 RCT in postmenopausal women showed reduced age-related bone loss at the lumbar spine and femoral neck after 3 years of supplementation. K2 from fermented foods (natto, sauerkraut, kimchi, miso, tempeh) is the food-based route; supplementation is the supplemental route. Either is reasonable.

Baseline DEXA scanning around age 60 (for women) or 65 (for men) provides the reference point. Repeat every 5 years or per clinician advice. Falls prevention through strength and balance training is the single largest intervention reducing fracture incidence in the elderly, larger than any specific dietary change.

Energy density matters more, not less

Appetite tends to decrease with age, and high-fibre plant-based meals are filling on relatively few calories. Older vegans need to actively work against unintentional weight loss because below-ideal BMI in elderly adults is associated with higher mortality and fracture risk. Strategies: include energy-dense foods at every meal (avocado, nut butters, tahini, olive oil, ground flaxseed, dried fruit); eat more frequent smaller meals if total daily volume is limiting; avoid filling up on bulky low-calorie vegetables before getting the calorie-dense and protein-dense components.

A useful planning rule: protein first, healthy fat second, vegetables third on the plate. Eating in that order ensures the muscle-supporting and energy-providing components are consumed before bulk-fillers reduce appetite. Smoothies are useful for energy density (a smoothie with soy milk, frozen banana, peanut butter, oats, flaxseed, and a scoop of pea protein delivers 500 to 600 kcal and 30 to 40 g protein in one drinkable serving).

Co-existing conditions. Older adults often have chronic kidney disease, type 2 diabetes, cardiovascular disease, or other conditions that affect dietary planning. The protein and calcium guidance above is for healthy older vegans; if you have CKD stage 3 or higher, protein recommendations differ and should be set by a renal dietitian. If you have heart failure, salt intake guidance applies. Work with a registered dietitian who knows both plant-based diets and your medical context. See cardiovascular outcomes, diabetes outcomes.

Frequently asked questions about vegan and vegetarian older adults

Do older vegans and vegetarians need more protein than younger adults?

Yes. The PROT-AGE Study Group (European Society for Clinical Nutrition and Metabolism, ESPEN, 2013) recommends 1.0 to 1.2 g protein per kg of body weight per day for healthy adults over 65, higher than the 0.8 g/kg/day adult RDA, to mitigate age-related muscle loss (sarcopenia). For older adults with acute or chronic illness, 1.2 to 1.5 g/kg/day. Vegan and vegetarian older adults should aim toward the upper end of this range to account for the slightly lower digestibility-adjusted protein quality of plant foods. A 70 kg older adult vegan therefore targets 84 to 105 g of protein per day, achievable but requires deliberate planning.

How does B12 absorption change with age?

Parietal cell function and intrinsic factor production both decline with age. Atrophic gastritis affects approximately 20 to 30% of adults over 60 and reduces stomach acid production, which impairs the release of protein-bound B12 from animal source foods. The B12 in supplements and fortified foods, which is not protein-bound, is not affected and remains available even with low stomach acid. The Institute of Medicine recommends that everyone over 50 should obtain most of their B12 from fortified foods or supplements rather than relying on food-bound B12. For older vegetarians who get their B12 from dairy and eggs, the case for switching to supplemental B12 strengthens with age. Older vegans should be on supplements anyway and may need higher daily doses (25 to 50 mcg) to compensate for absorption decline.

What is sarcopenia and why does diet matter?

Sarcopenia is the age-related loss of muscle mass and strength. It begins around age 40 and accelerates after 60, with typical adults losing 3 to 5% of muscle mass per decade and faster after age 75. Sarcopenia increases fall risk, fracture risk, loss of independence, and all-cause mortality. The two interventions with the strongest evidence are resistance training (2 to 3 sessions per week of progressive load) and adequate protein intake (1.0 to 1.2 g/kg/day for healthy elderly). Diet alone without exercise produces modest benefit; exercise alone with inadequate protein is less effective; the combination is what works. Older vegan adults can absolutely build and maintain muscle on plant proteins (Hevia-Larrain 2021 RCT in young men showed equivalent strength and hypertrophy with soy vs whey), but the same dose-response principles apply at any age.

What about bone density for older vegans?

The EPIC-Oxford 2020 Tong analysis (BMC Med) found vegans had approximately 2.3x the hip fracture rate of meat-eaters, with lower BMI and lower calcium and protein intake mediating most of the excess risk. Older vegans should aim for the upper end of calcium intake (1,200 mg per day, US IOM target for women over 50 and men over 70), maintain vitamin D supplementation, hit protein targets, do regular weight-bearing exercise, and consider DEXA scanning around age 60 to baseline bone mineral density. K2 supplementation (90 to 180 mcg per day of MK-7) has emerging supportive evidence for bone density maintenance and is reasonable. Avoid losing weight unintentionally; modest above-ideal BMI in older adults is protective.

Is it safe to become vegan in your 60s or 70s?

Yes, with appropriate planning. The published cohort data (EPIC-Oxford, Adventist Health Study-2) include older vegan and vegetarian populations with broadly favourable cardiovascular and metabolic outcomes. The specific considerations for late-life dietary transitions are: ensure adequate energy intake (older adults often unintentionally reduce calorie intake on high-fibre diets); ensure adequate protein from the start; supplement B12, vitamin D, iodine, and DHA; maintain bone-protective nutrition (calcium, K2 worth considering); work with a registered dietitian if you have any chronic conditions (diabetes, chronic kidney disease, etc.) that affect dietary planning. Sudden dietary changes are not advisable; gradual transition over weeks reduces the risk of inadequate intake.

What about dementia and plant-based diets?

The published cohort evidence on diet and dementia risk is suggestive but not conclusive. The MIND diet (Mediterranean-DASH hybrid, plant-forward but not vegan) has the strongest published association with reduced cognitive decline (Morris 2015 in Alzheimer's and Dementia). Adequate DHA throughout life supports brain function; B12 deficiency in older adults can mimic or worsen dementia symptoms and is reversible if caught early. The most defensible position: a well-planned plant-forward diet with attention to omega-3, B12, B6, and folate is reasonable for brain health alongside the more important interventions of physical activity, social engagement, sleep, and management of cardiovascular risk factors. The vegan vs vegetarian-vs-Mediterranean comparison for dementia outcomes is not well studied directly.

Sources cited. Bauer J et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group, J Am Med Dir Assoc 2013; 14: 542-559; Cermak NM et al. Protein supplementation augments the adaptive response of skeletal muscle to resistance-type exercise training: a meta-analysis, Am J Clin Nutr 2012; 96: 1454-1464; Hevia-Larrain V et al. High-protein plant-based diet versus a protein-matched omnivorous diet to support resistance training adaptations, Sports Med 2021; 51: 1317-1330; Tong TYN et al. Vegetarian and vegan diets and risks of total and site-specific fractures: results from the prospective EPIC-Oxford study, BMC Med 2020; 18: 353; Knapen MH et al. Three-year low-dose menaquinone-7 supplementation helps decrease bone loss in healthy postmenopausal women, Osteoporos Int 2013; 24: 2499-2507; Morris MC et al. MIND diet associated with reduced incidence of Alzheimer's disease, Alzheimers Dement 2015; 11: 1007-1014; BDA Older Adults food fact sheet. All values as of May 2026.