This document summarizes a presentation on the role of forests, trees, and agroforestry in food security and nutrition. It discusses how over 1 billion people rely on forest products for nutrition and income, and outlines the hypothesis that trees and forests are important for dietary quality and diversity through providing nutritious wild foods, supporting diverse agricultural landscapes, and providing ecosystem services. It then describes a study that found a relationship between higher tree cover and greater child dietary diversity in 21 African countries, based on nutrition and remote sensing data, but notes the limitations of this analysis. Finally, it lists some of CIFOR's current research projects relating to this topic.