The Implicit Relational Assessment Procedure (IRAP) and explicit measures were used with 21 college students to determine if body weight of target stimuli (photographic images of slim and overweight individuals) influenced perceptions of intelligence. The explicit measure was a computerized adaptation of the Anti-Fat Attitudes Questionnaire designed to reduce participant error. A Covert Perception Task was developed as an additional explicit measure in which participants rated the likelihood of success of slim and overweight job applicants. Correlational analyses were used to determine if disparity between current and idealized body mass index (BMI) influenced responding. Statistical analyses were applied to data to determine influence exerted by the gender of participants and/or by the gender of the portrayed target stimuli. Findings are discussed in relation to pro-slim versus anti-fat bias and gender differences in body-weight bias related to participants and targets.