Upcycled foods contain unmarketable ingredients (e.g., damaged food produce, by-products and scraps from food preparation) that otherwise would not be directed for human consumption. Upcycled food is a new food category and thus faces several challenges, such as definition development, inclusion in the food waste management hierarchy and public acceptability. This review provides an overview of these three challenges. The upcycled food definitions have been developed for research, food manufacturers, and multi-stakeholders use. Thus, there is a need for a consumer-friendly definition for the general public. A simplified definition is proposed to introduce these foods as environmentally friendly foods containing safe ingredients that otherwise would not have gone to human consumption such as damaged food produce, by-products and scraps from food preparation. Moreover, an updated version of the food waste management hierarchy has been proposed by including the production of upcycled foods as a separate waste management action that is less preferable than redistribution but more favourable than producing animal feed. Furthermore, consumer sociodemographic characteristics and beliefs, as well as food quality cues and attributes, were identified as crucial factors for the public acceptability of these foods. Future research should address these challenges to facilitate the introduction of upcycled foods.

PurposeThis study investigates factors motivating upcycled food choices and assesses the association between these factors and hesitancy towards upcycled food consumption in a Swedish population.Design/methodology/approachAn online food choice questionnaire was used. Participants (n = 682) were categorised into Inclined and Hesitant groups based on their intention to consume upcycled foods. The factors motivating upcycled food choices were identified using explanatory factor analyses. Independent t-tests assessed the differences in the mean importance score of factors between the two groups. The association between upcycled food choice factors and hesitancy towards consumption was evaluated by logistic regressions (adjusted for sociodemographic characteristics).FindingsThe most important upcycled food choice factor in both groups was ethical concerns, followed by natural content, sensory appeal, price, healthiness, familiarity and impression. The Inclined group’s mean importance score for ethical concern was higher than the Hesitant group (pvalue<0.001) and, except for natural content, the mean importance scores for the other factors were higher in the Hesitant group compared to the Inclined group (pvalue<0.05). Participants who perceived ethical concern as an important factor had lower odds of hesitancy (Odds ratio = 0.39; 95%CI:0.26,0.59; pvalue<0.001), and those who considered sensory appeal an important factor had higher odds of hesitancy (Odds ratio = 2.42; 95%CI:1.62,3.63; pvalue<0.001) towards upcycled food consumption compared to participants who did not consider these as important factors.Originality/valueThis is the first study investigating health and non-health-related upcycled food choice motives using a food choice questionnaire. Identifying these motives helps food developers and researchers determine factors influencing upcycled food consumption.

SummaryThis study investigates people's preferences for nutritional, environmental and food safety characteristics of upcycled foods according to their age group and assesses the association between age and the importance of these characteristics in a Swedish population. A food choice questionnaire was used for data collection, and 681 Swedish residents aged ≥18 years participated in this study. In young, middle‐aged and older adults, environmental (environmentally friendly preparation and packaging, local production and contribution to food waste reduction) and food safety (absence of additives, chemicals, genetically modified ingredients and contamination) characteristics of upcycled foods were more important than most nutritional characteristics (low energy and fat content and high fibre and protein content). There was a positive association between age and the importance score of nutritional characteristics, such as rich in vitamins and minerals, low energy and fat content and minimal food processing (P‐value < 0.05). A negative association was observed between age and the importance score of contribution to food waste reduction (P‐value = 0.014). There was a positive association between age and the importance score of food safety characteristics, such as the absence of additives, chemicals and genetically modified ingredients (P‐value < 0.05). Therefore, the environmental benefits and food safety aspects of upcycled foods can be considered for product development and marketing to facilitate the acceptability of these foods in all age groups. Since the nutritional attributes of upcycled foods were less important than their environmental and food safety characteristics, strategies should be introduced to educate people regarding desirable nutritional features to enable them to choose healthy upcycled foods.

Oyster mushroom (OM) cultivation generates residue that needs to be managed; otherwise, it will be converted into waste. One of the substrates for OM cultivation is the food industry by-product, e.g., a mixture of the brewer’s spent grain (BSG) and wheat bran. This study assesses the OM cultivation residue’s physical and nutritional characteristics as a potential upcycled food ingredient and also considers developing bread from this cultivation residue. The OM was cultivated in a mixture of 55% BSG and 45% wheat bran. After the OM harvest, the cultivation residue (mixture of BSG, wheat bran and mycelium) had a lighter colour and a pleasant aroma compared to the initial substrate. It contained protein (10.8%) and had high niacin (42.4 mg/100 g), fibre (59.2%) and beta-glucan (6.6%). Thiamine, riboflavin and pyridoxine were also present in the cultivation residue. The bread was developed from 50% cultivation residue and 50% wheat flour, and its scores for darkness, dryness, sponginess, sour taste, bitter aftertaste, and aromatic aroma differed from white bread (p-value < 0.05). However, its overall acceptability and liking scores were not significantly different from white bread (p-value > 0.05). Therefore, this OM cultivation residue can be used as a nutritious ingredient; nevertheless, product development should be further explored.