This article aims to investigate to what extent health care professionals in Portugal find health-related behaviors relevant as a criterion to priority setting, to study what type of risk behavior they consider relevant in such decisions and to compare their views with those of laypersons. An online questionnaire was used to collect data from a sample of 178 health care professionals and 295 laypersons. The statistical analysis was performed through the application of generalized linear models and logistic regressions. Health professionals consider more than laypersons that information about health-related behaviors is relevant in prioritization between individuals. Both groups regard information about illegal drug abuse, excessive alcohol consumption, and smoking more important to priority setting decisions than information about overweight or lack of physical exercise. The findings are important for the definition of rationing policies as the professionals' decisions are those that, ultimately, influence health expenditure.