We investigated on the factors related to nutritional pathway outcomes in allogeneic hematopoietic stem cell transplantation (Allo-HSCT). Patients who underwent Allo-HSCT (body mass index : 18.5 kg/m²≤ BMI <25 kg/m²) at the Department of Blood and Stem Cell Transplantation at the Shizuoka Cancer Center between 2012 and 2016 were evaluated from the day before pretreatment (T1) to the day after parenteral nutrition (PN) (T2). The weight loss rate of all 36 cases (median : 60 years old, 16 women, body mass index 21.3 kg/m²) was correlated with the skeletal muscle mass loss rate and the basal energy expenditure (BEE) sufficiency rate (r=0.73 : p <0.01, r=0.40 : p<0.05). The oral calorie intake / ideal body weight was negatively correlated with PN period and drug cost during PN (r=-0.55 : p <0.01, r=-0.77 : p <0.01). During the course of nutrition-related adverse events, oral calorie intake / ideal body weight was correlated with performance status (r=-0.97 : p <0.01, r=0.91 : p <0.01). The nutritional pathways used for Allo-HSCT could contribute to nutrition-related adverse events and medical resource cost savings. Therefore, the association of results in the nutritional pathway was thought to be the monitoring of BEE sufficiency to support weight associated with skeletal muscle mass during the course.