, Aug. 10 -- Drinking a glass of 100% fruit juice or a smoothie every day may help improve mental well-being, particularly among people who eat relatively little fruit and vegetables, according to a study by researchers at Newcastle University.

The four-week randomized trial involved adults who normally consumed two or fewer portions of fruit and vegetables a day. Researchers provided support to help participants increase their intake toward the recommended five portions a day.

Some participants were asked to eat whole fruits and vegetables only, while another group was encouraged to include a daily glass of fruit juice or a smoothie along with whole fruits and vegetables.

After four weeks, both groups had increased their fruit and veg...