All of the Roudybush diets are formulated by avian nutritionist Tom Roudybush, M.S. In his 16 years of nutritional research at the university of California, Davis, 10 of which specifically focusing on the nutritional requirements of pet birds, Tom has become a leader in the avian nutrition field. His work is the basis for most of the published nutritional research in pet birds that are available today. Roudybush pride themselves in providing pet with healthy food that is good for them, with ingredients their bodies require, not food that is appealing to our human eyes. That is why Roudybush only use high quality ingredients and never add food colorings.