>> goodbye. >> zhang zhenggang cooked all his own meals until a year ago.llphone. he doesn't expect much by way of care. most of china's elderly can't count on much more either, with ever fewer younger people to care for them. >> eat the rainbow! as they say. fresh produce keeps us healthy. the world health organization recommends we eat five portions a day. ideally, two portions of fruit and three of vegetables, about 400 grams in total. but that's an impossible goal for many. as a result, they have vitamin and mineral deficiencies, which makes them vulnerable to diabetes, cancer and cardiovascular disease. worldwide, one in five deaths is associated with poor diet. it's an acute problem in many parts of the southern hemisphere. plenty of fruit and vegetables are grown there, but the bulk of production is exported. today we consider the case of blueberries in peru. ♪ >> for a long time, reyna espinoza was unemployed. but these days her family often has to manage without her, she believes for work at 6:00 every morning. >> the blueberry fields are the best