This study investigated the relationship between loneliness, social risk-taking, health-related behavior, and physical and mental health in 91 first-year Finnish university students. Data were obtained from two instruments: the Differential Loneliness Scale (DLS) and the Social Risk-Taking Scale (SRT). The DLS measures individuals' satisfaction with interpersonal relationships in four areas--romantic-sexual, friendships, and familial and community relationships. The SRT assesses the degree of comfort experienced by an individual in a variety of social situations. The results indicated a moderate relationship between the DLS, the SRT scales, and a self-rated loneliness measure on the one hand and a mental health index on the other. Social psychological variables were found to be more closely linked to mental health than physical health, and the relationships were generally stronger for females than for males. (Author/JD)