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Food for Love provides home-cooked meals to people in need due to illness, caring for others, a death in the family, having a new baby, financial stress or other challenges.
About 120 volunteer cooks and bakers have provided more than 1500 meals since April 2016.
To celebrate Volunteering Central's National Volunteer Week campaign, Ms Langbein met Food for Love founders Louise Carney and Bex Sarginson at her Wanaka home and donated some baking to the group.
Volunteering Central spokeswoman Gillian White said she was ``thrilled'' Ms Langbein was keen to offer her support.
Ms Langbein was very impressed by the women and hoped her baking would be well received.
``The amount these two women contribute to their community is staggering.
``The fact they can slot in such a huge amount of volunteering blows me away.''
Ms Carney said Ms Langbein was ``very supportive'' of Food for Love and she enjoyed being able to talk to her on a personal and professional level.
``Meeting Annabel and telling her about our work and achievements was absolutely fantastic. She was really open and interested to hear our story and to learn about Food for Love.''
Ms Carney said Food for Love was always seeking volunteers and donations of food, meals, containers or baking.