During the increasing spread of COVID-19 occurrences in Chattogram Metropolitan Area (CMA) of Bangladesh, a series of measures were taken to control the transmission. These measures greatly influenced the knowledge, attitudes, and practices (KAP) of the population on their dietary behavior. However, there are no current studies demonstrating the KAP of the CMA citizens regarding their dietary habit that can boost the immunity. In this study, we appraised KAP in regard to immunity boosting dietary behavior from April 26, 2021 to November 17, 2021 during implementation of lockdown measures by the government of Bangladesh. Apart from the basic knowledge and attitudes toward immunity boosting dietary behavior, we have also aimed to assess the practices of the population by whether the nutrients, especially vitamin A, B6, B9, B12, C, D, E, and trace minerals such as zinc, selenium, and iron were included in their diet and in what frequency. This study is a cross-sectional study, and the participants were recruited using both online platforms during the lockdown and through in-person interviews after the withdrawal of lockdown. After obtaining the proper consent from the participants, their sociodemographic variables, and KAP towards immunity boosting dietary behavior were assessed. Total 400 participants were included in this study and a non-probability sampling technique named purposive sampling has been followed for participants recruitment. Among the 400 participants, the majority of them (64.3%) were male, most of them (62.7%) were students, unmarried (69.5%), aged between 18-35 years (82.5%), had a bachelor's degree (50.0%), and had a monthly family income between 10000-30000 BDT (35.5%). This study indicated that 82.8% of the populations had the correct knowledge, 71.3% had favorable attitudes, and 44% had good practices regarding immunity boosting diet during COVID-19. The majority (79.3%) of the participants had an idea about nutrition, most of them (78.5%) knew the nutrients needed to strengthen their immune system, almost all (98.5%) washed fruits and vegetables purchased from the market before eating them, 78% did not often purchase food online, and 53% often ate junk food. In a binary logistic regression, correct knowledge was significantly associated with the females, having HSC or bachelor's degree, being in the occupation of business, laborer or others, and having a monthly family income between 50000-100000 or >100000. The favorable attitudes were significantly associated with having a master's degree or above, and for government job holders. However, the good practices did not show any significant association with the sociodemographic factors in binary logistic regression. Moreover, the study found the presence of bad or unhealthy practices among the populations despite having correct knowledge and favorable attitudes. Thus, this study could identify the variables, such as gender differences, education, monthly family income, and occupation on which emphasis should be given during public health campaigns or training programs to improve the KAP regarding immunity boosting diet.

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