Researchers from Newcastle University found that adults who consumed one glass of fruit juice or a smoothie daily alongside increased fruit and vegetable intake showed significantly lower depression scores over a four-week period.

A randomised controlled trial conducted by Newcastle University has found a potential connection between daily fruit juice consumption and improved mental health markers. The study, published in the British Journal of Nutrition and funded by the Fruit Juice Science Centre, involved 42 participants who initially consumed two or fewer portions of fruit and vegetables daily. Participants were divided into three groups: a control group that maintained their usual diet, a group that increased whole fruits and vegetables to meet the 5-a-day recommendation, and a third group that combined increased whole produce with one daily glass of fruit juice or smoothie.

After four weeks, both intervention groups successfully increased their fruit and vegetable intake. However, the group that included daily juice or smoothies reported notably lower depression scores—measuring 2.52 points lower on a 27-point depression scale compared to the control group. Researchers described this difference as modest but statistically significant. The study found no adverse effects on metabolic health markers among juice consumers despite ongoing concerns about sugar content.

Fibre intake increased by an estimated 8-10 grams daily in both intervention groups, suggesting that juice consumption did not discourage participants from adding other fibre-rich foods to their diets. Dr Courtney Neal, who led the research, noted that simple, cost-effective dietary solutions could help people reach recommended nutrition targets while supporting mental wellbeing. The findings are particularly relevant given that fewer than one in five UK adults currently meet the 5-a-day recommendation, with financial barriers often preventing adequate fruit and vegetable consumption.