Sources and References

Online resources — Health Canada, Dietary Reference Intakes for older adults (canada.ca); Dietitians of Canada, Practice-Based Evidence in Nutrition (PEN); NIH National Institute on Aging (nia.nih.gov); Canadian Malnutrition Task Force (nutritioncareincanada.ca); The Mediterranean Diet Foundation (predimed.es); IDDSI (International Dysphagia Diet Standardisation Initiative, iddsi.org)

Chapter 1: Nutrition and Aging — Foundational Concepts

How Aging Changes Nutritional Needs

The relationship between nutrition and aging is bidirectional and dynamic. Aging changes virtually every physiological system relevant to nutrition — from the perception of hunger and the ability to chew and swallow food, to the efficiency with which the gut absorbs nutrients, to the capacity of cellular machinery to respond to nutritional signals. At the same time, the nutritional choices made across the lifespan meaningfully influence the rate and character of the aging process. Understanding this bidirectionality is foundational to effective nutritional practice with older adults.

Among the most consequential age-related changes for nutrition is the decline in energy expenditure that accompanies the loss of metabolically active lean tissue and reductions in physical activity. Total daily energy requirements in older adults are typically 20–30% lower than in young adults of the same sex. This reduction in energy intake would be straightforward to manage nutritionally if micronutrient requirements decreased proportionally — but they do not. Requirements for calcium, vitamin D, vitamin B12, and protein either remain stable or increase with advancing age, creating a situation in which the dietary energy window is narrower but must still accommodate all essential nutrient needs. The consequence is that nutrient density — the concentration of micronutrients per kilocalorie of food — must be higher in the older adult diet than in the diet of younger individuals.

Sensory and Physiological Changes Affecting Food Intake

The sensory appeal of food is a primary driver of appetite and food intake, and aging erodes sensory function across multiple modalities. The sense of smell (olfaction) declines substantially with age — by the seventh decade, more than half of adults show significant olfactory impairment as a consequence of reduced olfactory receptor neuron density and altered central processing. Because flavour perception depends primarily on orthonasal and retronasal olfaction rather than taste receptor input, olfactory decline has a profound impact on the enjoyment and palatability of food, contributing to reduced food intake and variety.

Taste also changes, though more modestly than olfaction. The number of taste buds per papilla declines, and the renewal rate of taste receptor cells slows, particularly for bitter and sour taste; salt and sweet perception are less affected. The practical consequence is that older adults may add excessive salt or sugar to food to achieve the same perceived flavour intensity that required less seasoning at younger ages.

Dentition and oral health are central to dietary quality in older adults. Edentulism (complete tooth loss), present in approximately 20% of adults over 65 in Canada, and poor-fitting dentures restrict the range of foods an individual can comfortably eat, favouring soft, processed foods over the fruits, vegetables, and lean proteins that form the foundation of a health-promoting diet. Xerostomia (dry mouth), commonly caused by the anticholinergic effects of medications or by salivary gland dysfunction, further impairs chewing and swallowing and reduces the protective buffering action of saliva on dental enamel.

Gastric motility slows with age, and the volume of the stomach’s accommodating reflex — the relaxation of the gastric fundus in response to a meal — is reduced, so the stomach fills more rapidly and the sensation of satiety arrives earlier in the meal. This early satiety, compounded by the loss of sensory appeal, reduced hunger, and gastrointestinal discomfort, collectively produces the anorexia of aging, a physiologically mediated reduction in appetite that is distinct from the pathological anorexia of eating disorders but is equally capable of causing progressive nutritional decline.

Chapter 2: Dietary Reference Intakes for Older Adults and the Healthy Diet

Interpreting the DRIs in the Context of Aging

The Dietary Reference Intakes (DRIs) established by Health Canada and the Institute of Medicine include separate reference values for adults aged 51–70 and those over 70, reflecting the accumulated evidence that physiological requirements change meaningfully across the adult lifespan. However, several limitations of the DRIs must be understood by practitioners working with older populations: the reference values are established for healthy individuals, not for those with the chronic diseases that are nearly ubiquitous in older age; they are based on largely cross-sectional data and subject to substantial methodological constraints; and the oldest-old (those over 80) are systematically underrepresented in the studies from which requirements are derived.

Protein requirements are a particularly contentious area in geriatric nutrition. The current RDA of 0.8 g/kg body weight per day was established based on nitrogen balance studies that are now considered methodologically inadequate for identifying the optimal protein intake for maintaining muscle mass and function in older adults. A large body of subsequent research suggests that intakes of 1.0–1.2 g/kg/day or higher are needed to attenuate the age-related loss of lean mass (sarcopenia), and that protein should ideally be distributed across meals in amounts sufficient to stimulate muscle protein synthesis at each eating occasion — specifically, approximately 25–30 g of high-quality protein per meal.

The Mediterranean Diet

The Mediterranean diet represents one of the most extensively studied dietary patterns in relation to chronic disease prevention and healthy aging. It is characterised by high intakes of vegetables, fruits, legumes, whole grains, nuts, and olive oil; moderate intake of fish, poultry, and dairy; low intake of red meat and processed meat; and moderate consumption of wine with meals. Rather than being a prescriptive nutrient-focused diet, it is a food-based pattern that reflects a traditional way of eating and living that incorporates communal meals and physical activity.

Prospective cohort studies, including the landmark PREDIMED (Prevención con Dieta Mediterránea) trial — a randomised controlled trial conducted in Spain — demonstrated that adherence to the Mediterranean diet supplemented with extra-virgin olive oil or nuts reduced the incidence of major cardiovascular events by approximately 30% compared to a low-fat control diet in high-risk individuals. Observational data also suggest associations between Mediterranean diet adherence and reduced risk of type 2 diabetes, Alzheimer’s disease, depression, and all-cause mortality.

The bioactive compounds responsible for the observed benefits are multiple and synergistic. Polyphenols in olive oil and vegetables (particularly oleocanthal, a natural anti-inflammatory compound in extra-virgin olive oil) exert anti-inflammatory and antioxidant effects. Omega-3 fatty acids from fish modulate eicosanoid production and reduce platelet aggregation. Dietary fibre from vegetables, legumes, and whole grains modulates gut microbiome composition and promotes short-chain fatty acid production, which in turn influences systemic inflammation, intestinal barrier integrity, and metabolic regulation.

Chapter 3: Vitamins, Minerals, and Supplements in Older Adults

Vitamin D and Calcium: An Inseparable Partnership

No nutrient pairing is more clinically significant in geriatric nutrition than vitamin D and calcium. Their roles in maintaining skeletal integrity are tightly coupled through a regulatory axis involving parathyroid hormone (PTH), calcitriol (1,25-dihydroxyvitamin D), and calcitonin. When serum calcium falls — as inevitably occurs when dietary intake is inadequate or absorption is impaired — PTH is secreted from the parathyroid glands, stimulating renal 1-alpha-hydroxylase to increase calcitriol production, which in turn increases intestinal calcium and phosphorus absorption and, if necessary, stimulates osteoclastic bone resorption to restore serum calcium at the expense of skeletal mineral stores.

In older adults, this regulatory axis is chronically stressed. Intestinal calcium absorption efficiency falls from approximately 35–40% in young adults to 20–25% in older adults, driven by reduced mucosal expression of the vitamin D receptor and its target transport proteins (TRPV6, calbindin-D9k). At the same time, vitamin D synthesis in the skin is impaired by the reduced concentration of 7-dehydrocholesterol in aging skin and by behavioural factors (more indoor time, more clothing, greater use of sunscreen). The resulting vitamin D insufficiency (serum 25(OH)D below 50 nmol/L) is present in an estimated 40–60% of community-dwelling older adults in Canada, with rates approaching 80–90% in nursing home residents who have negligible sun exposure.

Vitamin B12 Deficiency: A Geriatric Priority

Vitamin B12 (cobalamin) deficiency is particularly prevalent in older adults for reasons that are largely distinct from dietary inadequacy. The crystalline B12 used in food fortification and supplements does not require gastric acid for release and is absorbed by passive diffusion in addition to the intrinsic factor-mediated active transport mechanism. In contrast, the B12 naturally bound to food proteins requires gastric acid and pepsin for liberation from its food matrix before it can bind intrinsic factor. In older adults with atrophic gastritis — a condition causing histological loss of parietal cells with consequent achlorhydria and intrinsic factor deficiency — only the free, unbound B12 in fortified foods and supplements is reliably absorbed.

The neurological consequences of B12 deficiency — which can occur without haematological manifestations (megaloblastic anaemia) in approximately 30% of deficient individuals — include subacute combined degeneration of the spinal cord, peripheral neuropathy, cognitive decline, and psychiatric symptoms. The insidious onset of neurological B12 deficiency and its mimicry of other common geriatric conditions (dementia, depression, peripheral vascular disease) make it a frequently missed diagnosis. Health Canada recommends that adults over 50 obtain most of their B12 from fortified foods or supplements rather than relying on food-bound sources.

Vegan and Vegetarian Diets in Older Adults

Plant-based dietary patterns — vegetarian and vegan diets — carry well-established health benefits across the lifespan: lower rates of cardiovascular disease, type 2 diabetes, hypertension, obesity, and certain cancers. In older adults, however, plant-based diets require particular nutritional attention because the nutrients most vulnerable to deficiency in aging — B12, calcium, vitamin D, zinc, and complete protein — are found in their most bioavailable forms in animal-source foods.

A well-planned vegan diet for an older adult must address all these nutrients through a combination of food choices and supplementation. Protein requires particular attention: plant proteins generally have lower digestibility and lower DIAAS scores than animal proteins, and the essential amino acid profile may be limiting — lysine in grains, methionine in legumes — though strategic combination of complementary sources addresses most of these concerns. The emerging consensus is that older adults on plant-based diets should target protein intakes at the higher end of the recommended range (1.2–1.6 g/kg/day) and prioritise leucine-rich sources (such as soy protein and lentils) to maximise muscle protein synthesis stimulation.

Chapter 4: Malnutrition, Sarcopenia, and Frailty

Malnutrition in Older Adults

Malnutrition is not synonymous with undernutrition. The Global Leadership Initiative on Malnutrition (GLIM) framework, adopted in 2018, defines malnutrition as a syndrome diagnosed by the coexistence of at least one phenotypic criterion (unintentional weight loss, low body mass index, or reduced muscle mass) with at least one aetiological criterion (reduced food intake or assimilation, or the presence of disease burden and inflammation). This framework explicitly encompasses both protein-energy undernutrition and disease-related malnutrition with or without inflammation.

The Subjective Global Assessment (SGA) and its abbreviated clinical derivatives — the Mini Nutritional Assessment (MNA) and the MUST (Malnutrition Universal Screening Tool) — are validated instruments for identifying malnutrition risk in older adults across different care settings. The MNA is particularly validated for community-dwelling and hospitalised older adults and incorporates assessments of appetite, mobility, BMI, mid-arm and calf circumferences, and psychosocial parameters that recognise the multifactorial nature of nutritional risk in this population.

Malnutrition in hospitalised older adults is profoundly consequential: it is associated with prolonged length of stay, higher rates of postoperative complications, increased susceptibility to infection, delayed wound healing, higher rates of readmission, and increased mortality. The Canadian Malnutrition Task Force has driven significant quality improvement in hospital nutrition care through the development of standards, tools, and advocacy, with the goal of ensuring that malnutrition is screened, assessed, diagnosed, and treated with the same rigour as other clinical conditions.

Sarcopenia

Sarcopenia — from the Greek meaning “poverty of flesh” — describes the age-related loss of skeletal muscle mass, strength, and physical performance. Its prevalence increases from approximately 10% in community-dwelling adults in their sixties to over 50% in those over 80. The European Working Group on Sarcopenia in Older People (EWGSOP2) defines sarcopenia as a syndrome characterised by progressive and generalised skeletal muscle disorder involving accelerated loss of muscle mass and function.

At the cellular level, sarcopenia reflects multiple converging processes: loss of lower motor neurons (with consequent denervation of their motor units and incomplete reinnervation by surviving neurons, leading to enlargement of remaining motor units and fibre type grouping), impaired satellite cell activation and myogenesis, accumulation of intramuscular lipid and connective tissue, mitochondrial dysfunction, and blunted anabolic signalling in response to both exercise and dietary protein. The mTORC1 pathway — the master regulator of muscle protein synthesis stimulated by leucine and mechanical loading — shows reduced sensitivity in aged muscle, a phenomenon termed anabolic resistance that necessitates higher protein doses to achieve the same synthetic response as in younger muscle.

Frailty and Falls

Frailty is a clinical syndrome of reduced physiological reserve, defined by the Fried phenotypic criteria as the presence of three or more of: unintentional weight loss, self-reported exhaustion, weakness (measured grip strength), slow walking speed, and low physical activity. The intermediate state of pre-frailty (one or two criteria) represents an important intervention point because the transition from pre-frailty to frailty is not inevitable. Nutritional interventions — particularly adequate protein and energy intake, vitamin D supplementation, and the Mediterranean dietary pattern — have demonstrated efficacy in preventing or reversing pre-frailty when combined with physical activity.

Falls are the leading cause of injury in older adults and the foremost cause of injury-related hospitalisation and death. The risk of falling is multifactorial, involving impairments in balance, gait, strength, vision, vestibular function, proprioception, and executive function, as well as environmental hazards and medication side effects (particularly polypharmacy with psychoactive and antihypertensive agents). Nutrition contributes to fall risk through its effects on muscle mass and strength, vitamin D status (which influences muscle function through the vitamin D receptor in skeletal muscle, in addition to its effects on bone), and cognitive function.

Chapter 5: Chronic Disease Management Through Nutrition

Cardiovascular Disease

Cardiovascular disease (CVD) — encompassing coronary artery disease, heart failure, and stroke — is the leading cause of death in Canada and a dominant driver of disability, healthcare utilisation, and diminished quality of life in older adults. Nutritional factors are among the most modifiable risk determinants for CVD, and dietary interventions demonstrated to reduce CVD risk include reductions in saturated and trans fat intake, increases in omega-3 fatty acid and dietary fibre consumption, sodium restriction, and adoption of dietary patterns such as the Mediterranean diet and the DASH (Dietary Approaches to Stop Hypertension) diet.

The DASH diet was specifically designed and tested in randomised controlled trials to reduce blood pressure. It emphasises fruits, vegetables, low-fat dairy, whole grains, lean protein, and nuts, while restricting saturated fat, red meat, sweets, and sodium. The original DASH trial demonstrated reductions in systolic blood pressure of 11.4 mmHg and diastolic blood pressure of 5.5 mmHg in hypertensive participants — effects comparable to single-drug pharmacotherapy.

Type 2 Diabetes and Insulin Resistance

Type 2 diabetes mellitus affects approximately 30% of Canadians over 65 and is characterised by progressive insulin resistance in peripheral tissues (liver, skeletal muscle, adipose) coupled with inadequate compensatory insulin secretion from pancreatic beta cells. Nutritional management of type 2 diabetes in older adults must balance glycaemic control with the prevention of hypoglycaemia (which carries greater morbidity in older adults due to impaired counter-regulatory responses), adequate protein intake to preserve muscle mass, and maintenance of overall nutritional adequacy.

Carbohydrate quality — emphasising low-glycaemic index, high-fibre carbohydrate sources — is more important than carbohydrate quantity in most clinical guidelines for diabetes management. Dietary fibre, particularly soluble fibre from oat beta-glucan, psyllium, and legumes, slows gastric emptying and reduces postprandial glycaemic excursions, while simultaneously modulating the gut microbiome in ways that appear to improve insulin sensitivity through short-chain fatty acid-mediated pathways.

Alcohol Use in Older Adults

The pharmacokinetics and pharmacodynamics of alcohol are altered in older adults in ways that increase susceptibility to adverse effects at lower doses. Total body water decreases with age, raising peak blood alcohol concentrations for a given dose; hepatic alcohol metabolism slows; and neurological sensitivity to alcohol’s sedating and cognitive-impairing effects increases. Alcohol interacts adversely with many medications commonly prescribed in older adults, including anticoagulants, antidiabetic drugs, and CNS depressants.

At moderate intake levels, observational data have suggested cardioprotective effects — mediated in part by ethanol’s effects on HDL cholesterol and platelet aggregation — but this evidence has been substantially undermined by the recognition that “sick-quitter” bias (the tendency of people who have stopped drinking due to illness to be misclassified as lifelong abstainers in comparison groups) inflates the apparent benefits of moderate drinking in observational studies. Mendelian randomisation studies and meta-analyses using instrumental variable methods suggest that the cardiovascular benefits of moderate alcohol consumption are minimal or absent when genetic confounding is properly accounted for.

Chapter 6: Gastrointestinal Conditions and Nutritional Management

Select GI Conditions in Older Adults

The gastrointestinal tract is among the organ systems most profoundly affected by aging. In addition to the gastric changes described earlier, the small intestinal mucosa undergoes architectural changes — partial villous atrophy, increased crypt-to-villous ratio — that reduce absorptive surface area. Colonic motility slows, a primary contributor to the high prevalence of constipation (approximately 30–40%) in older community-dwelling adults. The enteric nervous system — the semi-autonomous “second brain” of the gut — loses neurons with age, contributing to dysmotility, and the composition and diversity of the gut microbiome shifts in characteristic ways, with reduced representation of beneficial anaerobes such as Lactobacillus and Bifidobacterium species.

Gastroesophageal reflux disease (GERD) is common in older adults, related to impaired lower oesophageal sphincter function and reduced oesophageal motility. Dietary modifications — avoiding large meals, minimising fat, caffeine, alcohol, and acidic foods, maintaining an upright position after eating, and achieving a healthy body weight — remain important components of management alongside pharmacotherapy.

Constipation management in older adults centres on adequate dietary fibre intake (25–30 g per day), which increases stool bulk and accelerates transit, and adequate fluid intake — a minimum of 1.5–2 litres per day, increased in hot weather or when fibre intake is raised, as fibre’s beneficial effects on stool consistency depend on adequate luminal water. Probiotic supplementation with Bifidobacterium and Lactobacillus strains has modest evidence for improving constipation in older adults, likely through modulation of colonic fermentation and motility-regulating signalling.

Diet and Cancer

Colorectal cancer (CRC) is the second most common cancer in Canada and has a strong nutritional aetiology. The World Cancer Research Fund/American Institute for Cancer Research continuous update programme has established that processed meat is a convincing risk factor for CRC, and red meat is a probable risk factor, with each 100 g per day increment of red meat consumption associated with approximately a 17% increased risk of CRC. The mechanisms may include the genotoxic effects of haem iron on colonocyte DNA, the formation of N-nitroso compounds from dietary nitrites and amines, and heterocyclic amines produced during high-temperature cooking.

Conversely, dietary fibre consumption is inversely and convincingly associated with CRC risk, with each 10 g per day increment associated with approximately a 10% risk reduction. Short-chain fatty acids produced from fibre fermentation — particularly butyrate — serve as the preferred energy substrate of colonocytes, promote colonocyte differentiation, suppress histone deacetylase activity (thereby modulating gene expression in ways that inhibit proliferation and promote apoptosis), and maintain intestinal barrier integrity.

Chapter 7: Bone, Pressure Injuries, Dementia, and Dysphagia

Diet and Osteoporosis

The nutritional determinants of osteoporosis risk span the entire lifespan, from the calcium and vitamin D intake that builds peak bone mass in adolescence, to the dietary patterns in midlife that influence the rate of bone loss, to the nutrient requirements of postmenopausal women and older men who must sustain a skeleton already depleted by hormonal changes and years of remodelling imbalance.

Calcium and vitamin D are the foundational nutritional interventions for osteoporosis prevention and management. However, clinical trial data on the independent effects of calcium supplementation on fracture risk have been inconsistent, and concerns have been raised about potential cardiovascular risks of high-dose calcium supplement use (as distinct from food-derived calcium). The current consensus favours obtaining calcium primarily from dietary sources — dairy products, calcium-set tofu, canned fish with soft bones, calcium-fortified plant milks — while reserving supplements for those unable to meet requirements through diet.

Protein intake is increasingly recognised as an important determinant of bone health in older adults, contrary to the older hypothesis that high protein diets increase urinary calcium losses and thereby harm bone. The acid-ash hypothesis — which proposed that dietary protein generates an acid load that stimulates bone resorption to buffer blood pH — has been largely refuted by controlled metabolic studies showing that the anabolic effects of protein on bone, mediated through IGF-1 and direct stimulation of osteoblast activity, outweigh any effects of dietary acid load.

Diet and Pressure Injuries

Pressure injuries (formerly decubitus ulcers) develop when sustained mechanical loading of the skin and underlying soft tissue — particularly over bony prominences — causes localised ischaemia and cellular death. They are common in bedbound and wheelchair-bound older adults and represent a significant burden of preventable harm in long-term care and hospital settings.

Nutritional status is a major determinant of both pressure injury risk and healing capacity. Protein deficiency impairs wound healing by reducing collagen synthesis, immune function, and the ability to mount an anabolic response to injury. The EPUAP/NPUAP/PPPIA guidelines recommend protein intakes of 1.25–1.5 g/kg/day for individuals at risk of or with pressure injuries. Arginine, a conditionally essential amino acid in the context of wound healing, is required for collagen crosslinking and nitric oxide production (which drives angiogenesis into the healing wound); specialised oral nutritional supplements enriched with arginine, vitamin C, and zinc have demonstrated efficacy in promoting pressure injury healing in randomised trials.

Dementia and Nutritional Challenges

The nutritional management of individuals with dementia presents unique and escalating challenges as the disease progresses through its stages. In early dementia, nutritional risk arises from executive dysfunction affecting food shopping, meal planning, and cooking, as well as from the depression and apathy that commonly accompany early disease. In moderate dementia, forgetting to eat, inability to feed oneself, agnosia for food items, and apraxia affecting utensil use compound food intake challenges. In late-stage dementia, dysphagia — the inability to swallow safely — becomes a central nutritional and safety concern.

The MIND diet (Mediterranean-DASH Intervention for Neurodegenerative Delay) was developed specifically to target the dietary components most strongly associated with cognitive preservation. It retains the core elements of both the Mediterranean and DASH diets but places particular emphasis on green leafy vegetables (at least six servings per week), other vegetables, berries, nuts, olive oil, whole grains, fish, beans, poultry, and wine; and explicitly restricts red meat, butter, cheese, pastries, sweets, and fried or fast food. An observational study by Morris and colleagues (2015) found that high adherence to the MIND diet was associated with a 53% lower rate of Alzheimer’s disease compared to low adherence, and that even moderate adherence was associated with a 35% lower rate.

Dysphagia and Modified Texture Foods

Dysphagia — difficulty swallowing — affects an estimated 30–40% of older adults in acute care settings and 50–75% in long-term care. It may be oropharyngeal (involving impaired oral preparation or pharyngeal propulsion) or oesophageal (involving impaired oesophageal peristalsis), and it carries serious consequences including aspiration pneumonia, malnutrition, and dehydration.

The International Dysphagia Diet Standardisation Initiative (IDDSI) has developed a universally applicable framework of eight levels (0–7) describing the texture of foods and the thickness of liquids, providing a common language for clinicians, dietitians, and food service providers across countries and care settings. Foods range from Level 3 (liquidised, no lumps) through Level 5 (minced and moist, tender, easily mashed) to Level 7 (regular, unrestricted). Liquids range from Level 0 (thin, water-like) through Level 4 (extremely thick, pudding-like).

Modified texture diets present a significant nutritional risk if not carefully managed: the addition of water, milk, or other diluents to achieve appropriate texture reduces energy and protein density, and the limited palatability and visual appeal of pureed foods further suppresses appetite. Strategies to mitigate this risk include using energy-dense additives (cream, oil, protein powder) during food preparation, preserving the visual form of original foods using moulds for pureed preparations, and providing small, frequent, nutrient-dense meals.

Chapter 8: Nutrition Across Care Settings

Community-Living Older Adults

The community-dwelling older adult faces nutritional challenges shaped by the intersection of physiological, social, and environmental factors. Social isolation and loneliness — affecting an estimated 20–30% of older Canadians — reduce the motivation to cook and eat, eliminating the social facilitation of food intake that drives higher consumption in company. Functional limitations in mobility, vision, or hand dexterity reduce the ability to shop for and prepare food. Fixed incomes and rising food costs create financial barriers to nutrient-dense food choices. Transportation barriers limit access to stores with fresh produce. And the design of many conventional kitchens — high shelves, poor lighting, heavy cookware — does not accommodate the physical limitations of older adults.

Food Security — defined by the USDA as access by all people at all times to enough food for an active, healthy life — is compromised in a substantial proportion of older Canadians. Indigenous older adults, those living in remote or rural communities, recent immigrants, and individuals with low education and income are disproportionately affected. Effective nutritional care in the community setting requires awareness of and connection to food support programmes, including Meals on Wheels, community lunch programmes, food banks, and congregate dining facilities, as well as advocacy for the structural conditions that determine food security.

Long-Term Care

Long-term care (LTC) facilities house the most nutritionally vulnerable older adults: those with advanced dementia, multiple comorbidities, complete dependence in activities of daily living, and the shortest remaining life expectancy. Malnutrition prevalence in LTC is estimated at 20–60% depending on assessment method and population. Feeding assistance — the provision of hands-on support during meals — is among the most effective and underutilised interventions available, consistently demonstrating improvements in food intake in randomised trials when provided with adequate time and skill.

The mealtime environment in long-term care profoundly influences food intake: communal dining in a home-like setting with appropriate music, lighting, tableware, and social facilitation produces meaningfully higher intake than tray service in isolation. The Dining with Dignity programme and similar quality improvement initiatives have demonstrated that systematic attention to the physical, social, and procedural dimensions of mealtime can achieve clinically meaningful improvements in nutritional status without pharmacological intervention. These findings highlight that malnutrition in LTC is not simply a biological inevitability of advanced age and disease but is partly a remediable consequence of institutional practices and resource allocation.