Factors affecting the menstrual cycle in women are: age, psychological, physical (heredity,nutritional status, and environment) and drugs. So far, the study on the menstrual cycle is only seen fromthe factors of nutritional status through the upper arm circumference and BMI (Body Mass Index). Thissituation encouraged researchers to conduct a study on the menstrual cycle length from nutritionalfactors as seen from body fat thickness.This study aims to analyze the correlation of body fat

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... and menstrual cycle length on the students. The study used an observational analytic with cross sectionalapproach. The population was all of the students in the first level of DIII Midwifery Department ofNursing and Midwifery Faculty of UNUSA who had regular menstrual cycles and do not take antidepressantdrugs/contraceptive device. The sample was mostly students using simple random sampling.The total of the sample was 72 people. The test analysis was done by a moment product (alpha 0.05). Theresult of the study showed that p value is 0,039 < 0,05. There was a correlation between the body fatthickness and menstrual cycle length of the first level students of DIII Midwifery Department of Nursingand Midwifery Faculty of UNUSA. The conclusion of this study was the thicker of the student's body fatthe longer their menstrual cycles. For the health workers, they can provide counseling on femaleadolescents about reproductive health especially menstruation and the risk of fat in the body.