Underweight remains a nutritional problem commonly found among children under five and may be influenced by various factors, including dietary intake patterns and infectious diseases. This study aimed to determine the association between dietary intake patterns and infectious diseases with the incidence of Underweight among children under five in the working area of Martapura Barat Public Health Center, Banjar Regency. This study employed an analytic observational design with a case control approach. The sample consisted of 92 children under five, including 41 Underweight children and 51 non-Underweight children. Dietary intake data were collected using a Semi-Quantitative Food Frequency Questionnaire (Semi-FFQ), while infectious disease data were obtained through interviews using a structured questionnaire. Data were analyzed using the Chi-Square test. The results showed that most children had deficient energy and carbohydrate intake, excessive protein intake, and normal fat intake. Most children had also experienced infectious diseases. Statistical analysis revealed no significant association between energy intake (p=0.191), protein intake (p=0.454), fat intake (p=0.207), carbohydrate intake (p=0.552), or infectious diseases (p=0.381) and the incidence of Underweight among children under five. Health workers are encouraged to enhance nutrition education for parents regarding balanced nutrient intake and to conduct regular growth monitoring through integrated health service posts.
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