The study is to test whether an education programme targeted at school children can lower salt intake in children and their families. In this study, the investigators will educate children on how to reduce salt intake, and the investigators will empower children by asking them to deliver the salt reduction message home to their families, particularly children need to persuade the person who does the cooking for the whole family to cut down on the amount of salt used during food preparations. The study will involve children aged about 11 years, and their parents and grandparents in Northern China.

Children

Inclusion Criteria:

• All children in Grade 5 of primary schools (age about 11 years) are eligible for the study.

Exclusion Criteria:

• Children who do not have lunch or dinner at their own home will be excluded.

Adult family members:

Inclusion Criteria:

• For each participating child, we will recruit two adult family members. All adult family members who share the same meals with the child are eligible for the study.

Exclusion Criteria:

• If more than two adults in one family agree to take part in the study, we will select two of them (i.e. one male and one female) in the order of grandparents, parents, uncles and aunties.