English for Nutrition & Dietetics: Essential Vocabulary

"energy density"

The amount of calories (kilojoules or kilocalories) provided per unit weight of a food, used to assess the caloric contribution of foods relative to their portion size

"The dietitian explained that nuts have a high energy density, providing roughly 600 kcal per 100 g, so portion control is especially important for weight management clients."

"macronutrient distribution"

The proportion of total daily energy intake derived from carbohydrate, protein, and fat, often expressed as a percentage and compared against reference ranges such as the AMDR

"The 24-hour dietary recall revealed a macronutrient distribution skewed heavily toward fat, with carbohydrate contributing only 35% of total energy."

"glycaemic index"

A numerical scale ranking carbohydrate-containing foods by how quickly they raise blood glucose relative to a reference food such as pure glucose or white bread

"Switching the client from high glycaemic index white rice to low glycaemic index basmati rice helped blunt postprandial glucose spikes without major dietary changes."

"essential fatty acids"

Polyunsaturated fatty acids, specifically linoleic acid (omega-6) and alpha-linolenic acid (omega-3), that the body cannot synthesise and must obtain through diet

"The assessment identified inadequate essential fatty acid intake in the vegan client, prompting a recommendation to increase flaxseed and walnuts in her daily meals."

"protein quality"

A measure of how well a dietary protein source supplies all indispensable amino acids in amounts proportional to human requirements, commonly assessed using the PDCAAS or DIAAS scoring methods

"Plant-based athletes are advised to combine complementary sources to achieve adequate protein quality, since most single plant proteins have lower DIAAS scores than animal proteins."

"resting metabolic rate"

The amount of energy expended by the body at complete rest to maintain basic physiological functions such as breathing, circulation, and thermoregulation, typically the largest component of total energy expenditure

"Using the Mifflin–St Jeor equation, the dietitian estimated the client's resting metabolic rate at 1,450 kcal/day before applying an activity factor to calculate total energy needs."

"thermic effect of food"

The increase in metabolic rate above resting level that occurs during the digestion, absorption, and processing of nutrients, accounting for approximately 10% of total energy expenditure in a mixed diet

"Protein has the highest thermic effect of food at around 20–30%, meaning a greater proportion of its calories are used in the process of digesting it compared to fat or carbohydrate."

"dietary fibre"

Non-digestible carbohydrate components of plant foods that resist digestion in the small intestine, pass to the large intestine, and exert benefits on gut health, blood glucose regulation, and lipid metabolism

"Increasing dietary fibre intake to 25–38 g per day through vegetables, legumes, and wholegrains was the first dietary modification the dietitian recommended for the hyperlipidaemic client."

"bioavailability"

The proportion of a nutrient that is digested, absorbed, and ultimately available for use in physiological functions, influenced by food form, nutrient interactions, and individual factors

"The dietitian noted that the non-haem iron in spinach has low bioavailability but can be enhanced by consuming it alongside a source of vitamin C such as lemon juice."

"recommended dietary allowance"

The average daily dietary intake level sufficient to meet the nutritional requirements of nearly all (97–98%) healthy individuals in a specific life stage and sex group

"The client's calcium intake fell well below the recommended dietary allowance of 1,000 mg per day, increasing her risk of low bone mineral density over time."

"tolerable upper intake level"

The highest average daily nutrient intake level likely to pose no risk of adverse health effects for almost all individuals; intakes above this level increase the risk of toxicity

"When counselling clients who self-supplement, the dietitian always checks whether combined food and supplement intake approaches the tolerable upper intake level for fat-soluble vitamins."

"iron deficiency anaemia"

A condition in which insufficient iron stores impair haemoglobin synthesis, resulting in small, pale red blood cells and symptoms including fatigue, pallor, and reduced cognitive performance

"Serum ferritin of 8 µg/L confirmed iron deficiency anaemia in the young female athlete, attributed to low dietary iron, heavy menstrual losses, and high training volume."

"vitamin D insufficiency"

A serum 25-hydroxyvitamin D level below the threshold considered adequate for optimal bone and immune health, typically defined as below 50 nmol/L, very common in populations with limited sun exposure

"Routine screening revealed widespread vitamin D insufficiency in the care home residents, prompting a policy change to provide routine supplementation through winter months."

"folate"

A water-soluble B vitamin (B9) essential for DNA synthesis, cell division, and single-carbon metabolism; critically important before and during early pregnancy to prevent neural tube defects

"All women of reproductive age are advised to take 400 µg of folic acid daily and to consume folate-rich foods such as dark leafy greens, legumes, and fortified cereals."

"electrolyte imbalance"

Abnormal concentrations of key minerals (sodium, potassium, chloride, magnesium, phosphate) in the blood that disrupt cellular function and can cause symptoms ranging from muscle cramps to cardiac arrhythmia

"Persistent vomiting in the client with bulimia nervosa had produced a significant electrolyte imbalance, with hypokalaemia requiring monitoring and medical management alongside the nutritional intervention."

"zinc"

An essential trace mineral involved in over 300 enzymatic reactions, immune function, wound healing, protein synthesis, and taste and smell perception; deficiency impairs growth and immune competence

"Zinc status is easily overlooked in dietary assessments but is particularly important to evaluate in elderly clients, strict vegetarians, and those with malabsorptive gastrointestinal conditions."

"24-hour dietary recall"

A structured interview technique in which a trained professional prompts an individual to recall and describe all foods and beverages consumed during the preceding 24-hour period, including estimated portion sizes

"Three non-consecutive 24-hour dietary recalls were conducted to capture day-to-day variability in the client's intake before calculating mean nutrient intakes."

"food frequency questionnaire"

A self-administered or interviewer-assisted tool that asks respondents to report how often they consume each item on a list of foods over a specified reference period, yielding estimates of habitual dietary patterns

"The epidemiological study used a validated 130-item food frequency questionnaire to estimate usual dietary patterns in the population cohort over the preceding twelve months."

"diet history"

A comprehensive dietary assessment method involving a detailed interview about habitual food intake patterns, meal frequency, cooking methods, supplement use, and food avoidances over an extended reference period

"Taking a thorough diet history revealed that the client regularly skipped breakfast and relied heavily on ultra-processed convenience foods during a hectic working week."

"weighed food record"

A method in which participants weigh all foods and beverages consumed over a defined period (typically 3–7 days) before eating, providing the most precise measure of actual intake

"A four-day weighed food record confirmed the athlete was significantly under-fuelling relative to training load, with total energy intake 800 kcal below estimated expenditure."

"nutrient analysis software"

A computer programme that calculates the nutrient composition of dietary data by matching reported foods to a nutritional database and summing daily or weekly intakes

"After entering the food diary into the nutrient analysis software, the dietitian identified that the client's diet was critically low in calcium, vitamin B12, and omega-3 fatty acids."

"anthropometric assessment"

The measurement of body dimensions and composition — including height, weight, body mass index, waist circumference, skinfold thickness, and bioelectrical impedance — to evaluate nutritional and health status

"Anthropometric assessment at the first appointment included height, weight, mid-upper arm circumference, and handgrip strength to establish a baseline for monitoring the malnourished patient's progress."

"dietary reference values"

A set of estimates of the amounts of energy and nutrients needed by different groups of healthy people in a population, used as benchmarks for assessing and planning diets

"Comparing the client's intake data against national dietary reference values highlighted a persistent shortfall in iodine, particularly concerning given her plans for pregnancy."

"under-reporting"

The systematic tendency of individuals to report lower food and energy intakes than actually consumed during dietary assessment, a recognised source of bias that can lead to underestimation of true dietary intake

"Energy intake from the food diary was compared with estimated total energy expenditure to identify likely under-reporting, which appeared substantial given the client's reported intake was 60% of predicted needs."

"low-FODMAP diet"

A three-phase dietary protocol restricting fermentable oligosaccharides, disaccharides, monosaccharides, and polyols — short-chain carbohydrates that are poorly absorbed and rapidly fermented in the gut — used for managing irritable bowel syndrome symptoms

"After six weeks on the low-FODMAP diet, the client reported a 70% reduction in bloating and abdominal pain, at which point the dietitian began a systematic food reintroduction phase to identify specific triggers."

"renal diet"

A dietary plan for patients with chronic kidney disease that restricts potassium, phosphorus, and sodium and adjusts protein and fluid intake based on the stage of kidney disease and treatment modality

"The renal diet for the haemodialysis patient limited potassium to 2,000 mg per day and required careful attention to hidden phosphate additives in processed foods."

"texture-modified diet"

A diet in which foods are altered in texture — through mincing, pureeing, or thickening — to reduce the risk of aspiration and improve swallowing safety in patients with dysphagia

"Following the speech and language therapist's assessment, the patient was placed on a level 5 minced-and-moist texture-modified diet in accordance with the IDDSI framework."

"ketogenic diet"

A very low-carbohydrate, high-fat diet that shifts the body's primary fuel source from glucose to ketone bodies produced by hepatic fat oxidation; used therapeutically for drug-resistant epilepsy and investigated for other conditions

"The paediatric dietitian carefully calculated the ketogenic diet ratio and energy prescription for the child with drug-resistant epilepsy, monitoring ketone levels weekly to maintain therapeutic ketosis."

"DASH diet"

The Dietary Approaches to Stop Hypertension eating plan, emphasising fruits, vegetables, wholegrains, low-fat dairy, and lean proteins while limiting sodium, saturated fat, and added sugars, shown to reduce blood pressure

"The cardiologist referred the newly diagnosed hypertensive patient to the dietitian for DASH diet counselling alongside the prescribed antihypertensive medication."

"gluten-free diet"

A diet that strictly excludes wheat, barley, rye, and any foods contaminated with these grains; the only established treatment for coeliac disease and also used in non-coeliac gluten sensitivity

"Following the biopsy-confirmed coeliac disease diagnosis, the gastroenterologist referred the patient to a dietitian for comprehensive gluten-free diet education and label-reading guidance."

"carbohydrate counting"

A meal-planning approach used in diabetes management in which the person monitors the total grams of carbohydrate per meal or snack to predict and control postprandial blood glucose response

"The diabetes educator taught the newly diagnosed Type 1 patient carbohydrate counting alongside insulin-to-carbohydrate ratios so she could adjust her rapid-acting insulin dose accordingly."

"Mediterranean diet"

A dietary pattern traditionally consumed in countries bordering the Mediterranean Sea, characterised by high intake of olive oil, fruits, vegetables, legumes, wholegrains, fish, and moderate red wine, with strong evidence for cardiovascular protection

"The PREDIMED trial provided robust evidence that a Mediterranean diet supplemented with extra-virgin olive oil or nuts reduced major cardiovascular events by approximately 30% compared with a low-fat control diet."

"nasogastric tube"

A thin flexible tube inserted through the nose, down the oesophagus, and into the stomach to deliver liquid enteral formula or medications to patients who cannot swallow safely or adequately

"The stroke patient was unable to meet his nutritional requirements orally, so a nasogastric tube was inserted on day two post-admission and enteral feeding commenced at a starter rate."

"percutaneous endoscopic gastrostomy"

A surgical procedure in which a feeding tube is placed directly through the abdominal wall into the stomach under endoscopic guidance, used for long-term enteral nutrition in patients with persistent swallowing difficulties

"After three months of nasogastric feeding following the head injury, the multidisciplinary team agreed to proceed with percutaneous endoscopic gastrostomy placement to facilitate rehabilitation and discharge planning."

"enteral formula"

A nutritionally complete or supplementary liquid feed delivered through a tube or consumed orally, available in standard, disease-specific, elemental, and semi-elemental formulations

"The dietitian selected a high-energy, high-protein enteral formula with an immune-modulating profile for the critically ill patient undergoing major abdominal surgery."

"total parenteral nutrition"

The intravenous delivery of all nutritional requirements — including dextrose, amino acids, lipid emulsion, electrolytes, vitamins, and trace elements — when the gastrointestinal tract cannot be used

"Total parenteral nutrition was initiated via a central venous catheter for the patient with short bowel syndrome following massive intestinal resection, with the goal of transitioning to enteral nutrition as the remaining bowel adapted."

"refeeding syndrome"

A potentially fatal metabolic complication occurring when nutrition is reintroduced too rapidly to a malnourished or starved individual, characterised by dangerous shifts in electrolytes — particularly hypophosphataemia — that can cause cardiac, respiratory, and neurological failure

"To prevent refeeding syndrome in the severely malnourished patient, the team followed NICE guidelines by starting at a maximum of 10 kcal/kg/day and correcting electrolyte abnormalities before advancing the feed."

"feed tolerance"

The degree to which a patient can receive enteral or parenteral nutrition without developing adverse reactions such as nausea, vomiting, diarrhoea, abdominal distension, or large gastric residual volumes

"Feed tolerance was assessed every six hours during the initiation phase; when the patient developed a residual volume of 250 mL the rate was temporarily reduced and a prokinetic agent prescribed."

"malnutrition universal screening tool"

A widely used five-step validated screening tool that assesses BMI, unplanned weight loss, and the effect of acute disease on nutritional intake to categorise adults as low, medium, or high nutritional risk

"All patients admitted to the surgical ward were screened using the malnutrition universal screening tool within 24 hours of admission; those scoring two or above were referred for a full dietetic assessment."

"nitrogen balance"

The difference between nitrogen intake from dietary protein and nitrogen losses via urine, faeces, and skin; a positive balance indicates net protein synthesis, while a negative balance indicates catabolism

"Serial nitrogen balance measurements in the critically ill patient showed she remained in negative balance despite a protein prescription of 1.5 g/kg/day, prompting an increase to 1.8 g/kg/day."

"motivational interviewing"

A collaborative, person-centred counselling style that explores and resolves ambivalence about behaviour change using reflective listening, open questions, affirmations, and eliciting change talk

"Using motivational interviewing, the dietitian resisted the urge to lecture the client about sugar intake and instead asked open questions that helped the client articulate his own reasons for wanting to improve his diet."

"health at every size"

A movement and clinical approach that decouples health promotion from weight loss, emphasising weight-neutral interventions, body respect, joyful movement, and intuitive eating to improve wellbeing regardless of body size

"The dietitian practised from a health at every size framework, focusing the consultation on sustainable behaviour change and improving the client's relationship with food rather than targeting a specific weight goal."

"nutrition care process"

A standardised four-step clinical framework — nutrition assessment, nutrition diagnosis, nutrition intervention, and nutrition monitoring and evaluation — used by registered dietitians to plan and document patient-centred care

"The newly qualified dietitian used the nutrition care process to structure her thinking, writing a formal PES statement in her nutrition diagnosis that identified the specific problem, its cause, and the measurable signs and symptoms."

"food insecurity"

A state of limited or uncertain access to adequate food due to financial, geographic, or social constraints; a critical social determinant of dietary quality and nutritional status

"Screening for food insecurity at the first appointment revealed that the client regularly went without meals in the final week before payday, a crucial context for understanding her irregular dietary pattern."

"intuitive eating"

A non-diet approach developed by Tribole and Resch that encourages individuals to honour hunger and fullness cues, reject diet mentality, and make food choices based on internal signals rather than external rules

"After years of yo-yo dieting, the client was introduced to intuitive eating principles, beginning with the practice of distinguishing physical hunger from emotional eating triggers."

"PES statement"

A structured nutrition diagnosis statement in the format Problem, Etiology, Signs/Symptoms that concisely describes the specific nutritional problem, its probable cause, and the evidence supporting it

"The PES statement read: "Inadequate oral intake (P) related to poor appetite secondary to chemotherapy (E) as evidenced by 8% unintentional weight loss over four weeks and dietary intake below 50% estimated needs (S).""

"dietary adherence"

The degree to which a patient's actual food intake corresponds to the dietary recommendations or meal plan prescribed by a healthcare provider, a key predictor of clinical outcomes in nutrition interventions

"Poor dietary adherence to the low-sodium prescription was identified through a follow-up 24-hour recall and attributed to the client's reliance on takeaway meals during a demanding work schedule."

"scope of practice"

The range of tasks, client presentations, and settings in which a nutrition professional is competent and authorised to practise, defined by professional registration bodies and informed by training and experience

"The nutritionist recognised that prescribing an enteral formula regimen for the post-surgical patient fell outside her scope of practice and made an urgent referral to the hospital's clinical dietitian."