As a doctoral student, Maddison Greaves' research focused on weight stigma and weight-based discrimination within provider-patient interactions for clinically obese individuals. She investigated how specific experiences contributed to weight-bias internalization and psychological distress, and how these factors influenced maladaptive eating behaviors like emotional or binge eating.

Maddison also examined the impact of weight stigma on eating behaviors and weight perceptions across various spheres of influence, including healthcare settings and interpersonal relationships. Her long-term goal was to develop interventions that reduce weight stigma in provider-patient interactions and to evaluate clinical best practices that promote healthy eating behaviors and reduced weight-based psychological distress.

Additionally, Maddison aimed to improve how dietetic students are trained to better address weight bias.