As part of his work with Unicef, Tom participated in the Live Below the Line challenge, during which he lived on just £1 a day of food and drink, highlighting how little nutrients so many millions of children depend on, and how this can lead to malnutrition. Watch what Tom had to say about the challenge.
In 2013, Tom spent time with children and families in Guinea hearing their stories and seeing how Unicef supports them on the ground. He visited several Unicef projects, finding out about our work in child protection, education, water and sanitation, hunger and malnutrition.
Read more about Tom's trip to Guinea
You can also follow Tom on Twitter at @twhiddleston.