With the global population set to reach 9.8 billion by 2050, including a doubling of adults aged ≥60 years old(1,2), sustainable dietary transitions are increasingly urgent. One postulated solution is controlled environment agriculture (CEA) vertical farming (VF), defined as plant factories in which environmental conditions are intricately controllable(3).
VF affords opportunities to reduce climate impact, such as reductions in water and land use(4). Further, it allows for tailoring the nutritional profiles of food through methods such as light manipulation and agronomic biofortification(5,6). This is especially relevant to older adults, with their inherent specific nutritional needs and the role of diet in healthy ageing(7). However, older adults have high rates of food neophobia(8) that may hinder acceptance of novel VF produce. This study assessed the acceptability of VF in UK older adults.
An online survey within a UK older adult cohort (≥60 years old) (n=680) assessed knowledge, sentiment scores (SS), and attitudes (Likert scales) towards VF. Willingness to pay (WTP) and purchasing likelihood for VF products were also assessed. Sentiment scores were generated using text highlighting(9). Data were analysed across genders and the index of multiple deprivation (IMD). Mann-Whitney and Kruskal-Wallis were used for non-normally distributed data. Two-way repeated measures ANOVA and two-factor MANOVA were used where applicable. Purchasing likelihood was evaluated using ordinal regression.
Knowledge of VF was low (44%), with fewer participants (23.6%) understanding CEA VF. Total SS were ambivalent (8.8), with no significant gender or IMD differences. However, sentences concerning sustainable benefits, e.g. yield, land and water use, were positive (range; 14-23). Females showed more positive SS for tailoring VF to support older adults’ nutritional needs (p=0.012). Attitudes (from Likert scale) were mostly neutral, with females slightly more favourable towards environmental concerns (p=0.008) and food fortification (p=0.03). WTP for VF produce was slightly higher (£0.016) than for conventionally produced foods (p < 0.001), with no significant differences between genders and IMD. 43% of participants were more likely to purchase VF produce, while 10% were less likely. Lower-income households (0.59 OR; 0.40–0.88, p=0.008); lack of knowledge of food fortification (0.62 OR; 0.42–0.89, p=0.011) and those with the more negative SS, SS Q1 (0.45 OR; 0.29 – 0.71, p=0.046) and SS Q2 (0.65 OR; 0.43 – 0.99, p<0.001) where significantly less likely to purchase VF produce.
Low knowledge and negative sentiment towards VF, coupled with low WTP, pose significant barriers to adopting VF food products in older adults. Socio-economic factors like income also affect purchasing likelihood, potentially exacerbating current health gaps. Increasing VF awareness and improving attitudes whilst reducing VF production costs could help promote its adoption in this demographic.