There is very little information on the diet of Amazonian Grosbeak. Apparently it mostly consumes seeds and fruit, although perhaps it also eats some insects. The few stomachs that have been examined contained a small quantity of seeds (Schubart et al. 1965), berries and fruits (Haverschmidt 1968), and fruit (Willard et al. 1991). It also has been observed consuming seeds of Guadua bamboo (Lebbin 2006).