This study aims to identify nutritional awareness level and effect of dietary habits on the psychological state of Jordanian Athletes. The descriptive approach and questionnaire are used as a data collection tool. The questionnaire is divided into two parts. The first part contains 19 questions about the daily dietary practices, and the second one contains 25 items on the relationship between the food eaten during training and competition periods and the physiological state. The study sample consists of 278 male and female athletes exercising 23 different sports (team and individual sports) in the age group 18 and above. The number of male athletes is 194 by 69.8% of the sample, while the number of female athletes is 84 by 30.2% of the sample. Arithmetic means, standard deviations, percentages, T-test and Cronbach's alpha formula are used to analyze findings of the study. The findings show that the daily dietary practices and habits are different in variables of gender, educational level and age group. The findings show that there is a statistically significant relationship in effect of eating habits on the psychological state of athletes. As for the daily dietary practices and their effect on the psychological state, the breakfast and lunch have the most significant impact on improvement of psychological state and are statistically significant. The study recommends that athletes should be educated about effect of food on the psychological state through educational courses and seminars, and the types of food they have should be determined by their coaches.