To investigate the influence of weight and weight perception on body dissatisfaction (BDI), eating attitude (EAT26), and perceived physical activity level (PPA), Korean female junior (J) and senior (S) high school students were evaluated. The J and S students were divided into two groups based on being either ≤ 100% (BI) or > 100% (AI) of the ideal weight (JBI, 376, 14.8, 46.1, 158.2; JAI, 128, 15.0, 57.4, 157.7; SBI, 325, 17.4, 50.1, 162.4; and SAI, n = 133, 17.5 yr, 58.2 kg, 159.3 cm). Questionnaires were designed to assess weight perception, body image, eating behavior, and weight control strategies including diet and exercise. A 5-point PPA was also administered. JAI (10 kg) and SAI (9.8 kg) desired to lose weight more than JBI (2.4 kg) and SBI (3.6 kg), respectively (ANOVA, P < 0.005). 85% of JAI and 93% of SAI perceived their weight to be above the average of the general population although the majority of them were not; 23% of JBI and 34% of SBI responded similarly (Chi-square, P < 0.001). BDI and EAT26 scores were lower in JBI (9.7, 12.0) and SBI (12.4, 12.4) than JAI (16.4, 14.7) and SAI (19.5, 15.4), respectively (ANOVA, P < 0.001). However, PPA was not different for JBI vs. JAI, and SBI vs. SAI. Only 17, 18, 9 and 15% of JBI, JAI, SBI, and SAI, respectively, exercised regularly. No differences were found in perceived eating behavior. PPA and BDI were only slightly correlated in JBI (r = 0.194, P < 0.005) and SBI (r = 0.220, P < 0.005). In conclusion, although Korean female teenagers perceived they are heavy and desired to lose weight, adequate exercise and physical activities were not properly practiced and maintained.