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This study (1) assessed restaurant consumers' perceived importance of better food quality versus larger portion sizes, (2) classified restaurant consumers into different segments based on their perceived importance of seven food quality attributes (taste, texture, aroma, appearance and the use of natural, local and organic ingredients) relative to portion size and (3) compared the identified market segments.

An online survey assessed 613 USA adult participants' perceived importance of seven food quality attributes relative to portion size. A K-means cluster analysis classified participants into different segments based on their perceptions.

Five restaurant consumer segments were identified: sensory-oriented consumers, taste-oriented organic food consumers, local and natural food consumers, quantity-oriented consumers and quality-oriented consumers. In general, quality-oriented consumers were the least likely to visit fast-food restaurants, had the highest average per-meal spending and were the least likely to eat out alone. Local and natural food consumers and taste-oriented organic food consumers had higher total restaurant spending than other groups. Quantity-oriented and sensory-oriented consumers visited fast-food restaurants more often and had lower total restaurant spending and per-meal spending than other groups. Age, sex and income were significantly associated with the segmentation outcomes.

Findings suggest promising opportunities for restaurants to enhance consumer perceptions of value by prioritizing the factors that hold the greatest significance to their target customers.

This study is the first attempt to segment restaurant consumers based on their perceived importance of food quality attributes relative to portion size, effectively identifying five distinct consumer segments.

The purpose of this study is to evaluate the perception and knowledge of standard food/meal portion size and related factors in young adults.

The present study was conducted on 1,000 volunteer young adults, consisting of 504 men and 496 women (18 and 28 years). The portion size of food/meal, amount of food measuring utensils and also nutritional knowledge were evaluated via a questionnaire and some visual materials.

Knowledge of portion sizes, amount of food each utensil holds and nutrition was evaluated via a questionnaire and some visual materials. Knowledge of portion size with respect to food groups (p = 0.015), meals (p < 0.001) and food measuring utensils (p = 0.002) and nutritional knowledge scores (p = 0.011) differed based on body mass indexes (BMI). Women had on mean a higher nutritional knowledge score than men (2.0 ± 1.3, 1.9 ± 1.1 points, respectively). The probability of having knowledge about food measuring utensils was 1.4-fold greater for individuals who had been previously educated about nutrition (p = 0.034). Individuals of the faculty of health sciences had higher mean scores for all portion scores (p < 0.05).

The study findings highlighted that portion knowledge and perception of young adults were affected by gender, BMI, enrolled faculty and nutritional knowledge status. This is the first study, through which the portion knowledge and perception subcomponents (food, meal and measuring utensils) are evaluated, indicating each subcomponent to be affected by distinct factors.

The purpose of this paper is to explore older people’s food consumption experiences. Specifically, the paper seeks to provide understanding on the influence of food intake on consumer vulnerability and how this manifests within people’s lives.

The study adopts an interpretive, exploratory approach, using in-depth interviews with 20 older consumers in the UK. Thematic analysis is conducted, establishing patterns and contradictions with the data.

The findings demonstrate how biological, psychological and social age-related changes can contribute to reduced food intake in later life. The loss of control over one’s consumption experiences as a result of inappropriate portion sizes acts as a source of both immediate and future vulnerability. Resultant food wastage can serve as an immediate reminder of negative associates with ageing, while the accumulative effect of sustained under-consumption contributes to increased frailty. As a result, consumer vulnerability can pervade other contexts of an individual’s life.

The research reveals opportunities for firms to use packaging development to reduce experiences of consumer vulnerability through reduced apportionment of packaged food products. However, this needs to be considered within a multi-demographic marketplace.

This paper contributes to literature by providing a unique lens with which to understand consumer vulnerability. The findings offer a developmental perspective on the experience of consumer vulnerability, revealing the stages of proximate, immediate, intermediate and ultimate vulnerability. This perspective has the potential to offer more detailed, nuanced insights into vulnerability in other contexts beyond food consumption.

The purpose of this paper is to assess the effect of involvement in food preparation on estimated calorie content, perception of portion size and desirability of the food item.

To test the hypotheses, three between-subjects experiments (one online, two in a laboratory setting) were conducted. Across the three experiments, participants were presented with a food item either ready for consumption (low involvement) or with the individual ingredients in need of assembly prior to consumption (high involvement).

Results showed that when a consumer is involved in the preparation of their food, they perceive the food to be lower in calories and smaller in portion size than when the same food is presented fully prepared and ready-to-eat. In addition, the effect of food preparation involvement on perception of portion size has negative downstream consequences on food desirability, as a smaller perceived portion resulted in a less desirable food item.

To the authors’ knowledge, the results of this research are the first to focus on the impact of preparation involvement on perceptions of the specific product attributes of calorie content and portion size, and the downstream effect on desirability.

Discusses practical issues about dietary survey methods for use with free‐living individuals. Reviews prospective and retrospective methods indicating that no single method is flawless. Likely sources of error include bias as a result of sampling and response; changes in diet; variation with time; frequency of consumption; reporting food weight and matching foods with those in tables of food composition. Concludes that the choice of method will depend on the purpose of the investigation, and factors such as interest in food requirements, association between diet and disease and the need to know about the intake of individuals or groups of people will be highly relevant.

Obesity among elderly consumers precipitates undesirable health outcomes. This study aims to investigate the effects of environmental cues on food intake of elderly consumers in an aged-care facility.

A longitudinal study conducted over 17 weeks in situ within an aged-care facility with 31 residents investigated how auditory (soothing music), olfactory (floral-scented candle) and visual (infographic on health benefits of the main meal component) cues influenced food intake quantity during a meal, while accounting for portion size effect (PSE).

Analysing the cross-sectional results of individual treatments and rounds did not reveal any consistent patterns in the influence of the three environmental cues. Longitudinal analyses, however, showed that the presence of auditory and olfactory cues significantly increased food intake, but the visual cue did not. Moreover, PSE was strong.

Extending research into environmental factors from a commercial to a health-care setting, this study demonstrates how the presence of auditory and olfactory, but not cognitive cues, increased food intake behaviour among elderly consumers. It also shows that a cross-sectional approach to such studies would have yielded inconclusive or even misleading findings. Merely serving more would also lead to higher food intake amount.

Environmental factors should be a part of health-care providers’ arsenal to manage obesity. They are practical and relatively inexpensive to implement across different health-care settings. However, the same environmental factors would have opposite desired-effects with normal or underweight residents, and hence, aged-care facilities need to separate the dining experience (or mealtime) of obese and other residents. Quantity served should also be moderated to discourage overeating.

While studies into managing obesity, particularly among older adults, have mainly focused on techniques such as pharmacotherapy treatments with drugs, dietary management or even lifestyle change, less attention has been given to the influence of environmental cues. This study, executed in situ within an aged-care facility, provided evidence of the importance of considering the impact of environmental factors on food intake to help reduce obesity.

The purpose of this paper is to determine the level of food self‐sufficiency, un‐accessed portions of food, and food gap between the national food security line of the country and consumption by its people. It also aims to scrutinize the major physical and economic factors inducing food insecurity in the country.

The paper applies descriptive statistics using mainly secondary data with the support of some primary information.

Pakistan is almost self‐sufficient in food production even if only 30 percent of its production potential has been achieved. In spite of such a situation, the average food consumption of its people is still significantly below the standards set up for the national food security line. The study also established that the food gap in the country is 30 percent, while a 35 percent portion of available food is un‐accessed due to various constraints spawned by physical, economic and sometimes natural factors. Out of the seven administrative units of Pakistan, Punjab and Sindh are the main food producing units while the Federally Administered Tribal Areas (FATA) are the most highly food deficit unit. Irrespective of the level of local food production, food gap still exists in all administrative units due to inefficient food procurement and distribution system, illegal movement of food commodities, poor monitoring of marketing systems, lower purchasing power and natural disasters.

The paper elaborates on the average situation of the country, and establishes the baseline for future research to investigate the issues of food security deeply, providing some key recommendations.

The paper investigates the concept of food security through the important indicators, i.e. food gap and un‐accessed portion of food, and tries to sort out the factors inducing such gaps.

This systematic review (SR) aims to investigate plate waste quantity, determinant factors, and food waste costs in Indonesian hospitals.

This SR was conducted by searching for articles published on the Web of Science, PubMed, Emerald insight, ScienceDirect and hand-searching on nationally accredited journals in Indonesia which consist of 29 journals in nutrition, environment and public health. The inclusion criteria in this review were peer-reviewed articles, original research, research locations in hospitals in Indonesia and articles in English or Bahasa (Indonesian language).

There were 21 studies (17 observational studies and 4 experimental studies) included in this systematic review. Results from 17 observational studies showed that the median plate waste was 27.6% (14.8%–88.7%). High plate waste was found in this review, particularly in pediatric patients and patients who receive liquid diet orally. Staple food and vegetables have a high contribution to patients’ plate waste. Economic costs of plate waste were $0.07–$0.5 per capita per day. Determinant factors of patient’s plate waste were patient clinical conditions, food taste and environmental conditions of hospital food service. Results from four experimental studies showed that meal replacement and smaller food portion intervention could reduce significant plate waste. Nevertheless, there is no conclusive evidence for food waste reduction intervention because of small intervention studies in Indonesia.

There was a high disparity in the quantity of plate waste and economic costs between studies included in this review.

Improving food sensory and adjusting food portions particularly for staple food and vegetables can be done as a way to reduce patient’s plate waste.

This SR is the first review of Indonesian hospital plate waste.

The purpose of this paper is to analyze the fat, saturated fatty acid and trans fatty acid contents in ready-to-eat foods distributed at amusement parks to develop an appropriate food safety management system for children.

In all, 322 ready-to-eat food samples categorized into 17 types were collected from nine Korean amusement parks and their fat, saturated fatty acid and trans fatty acid contents were assessed.

Fat, saturated fatty acid and trans fatty acid contents were relatively high in flour-based products. On the basis of the Korea Food and Drug Administration classification, the samples in 12 categories were classified as high-fat foods. The samples in nine categories were classified as high-saturated fatty acid foods. Most samples also contained non-negligible levels of trans fatty acids. The fat, saturated fatty acid and trans fatty acid contents of samples even in the same category varied markedly.

This research will inform the necessity of an appropriate safety management system for ready-to-eat foods distributed at amusement.

Although the fat contents of foods distributed around school area were often observed, the potential risk of those in ready-to-eat foods distributed at amusement parks have rarely been assessed. As patterns of food intakes vary world-widely, a periodic monitoring data like this study may be useful for international organizations and researchers.

University students are one of the vulnerable groups in terms of having nutritional problems due to their lifestyle and social environment. This study aims to determine the consumption of fast food among university students and evaluate factors that may impact it, such as sociodemographic factors, body mass index (BMI) or nutritional habits.

A cross-sectional study was conducted among a random sample of 184 university students (47.8% men and 52.2% women) with a mean age of 21.1 ± 2.0 years. The survey included students’ sociodemographic characteristics, anthropometric measurements, nutritional habits and fast-food consumption. Chi-square test, t-test and binary logistic regression analysis were used depending on the characteristics of the data.

Results indicated that 39.7% of the students consumed fast food at least once in 15 days and preferred these foods for taste, workload and social activity. Consumption of fast food occurred at an earlier age in men (%13.6) and the portions were higher than portions of vegetables (p = 0.001). By using regression analysis, a statistically significant relationship was found between the frequency of fast-food consumption and age, gender, economic status, BMI, the amount of vegetables consumed daily and the habit of eating breakfast (p < 0.05).

It is planned to reach more students in the study. However, due to the COVID-19 pandemic, transportation to students became difficult or could not be reached.

This study is one of the rare studies examining students’ orientation to fast food. The number of studies in this field in Turkey is limited.