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The inclusion criteria to the study group will be as follows; 1. to undergo a Cow's milk elimination (CME) diet or took a hypoallergenic formula in 0-2 years of age for at least 3 months or longer due to CMA allergy. 2. improvement of CMA after receiving CME diet, 3. to eliminate other nutrients (e.g., eggs, potatoes, wheat flour, soybean, etc.) other than cow's milk between the ages of 0-2 for at least 3 months or longer, 4. to add other nutrients (as mentioned in criterion 3) back to their diet in the last 3 months, 5. not receiving hypoallergenic formula for the last 3 months, 6. not to be on the CME diet at present. The exclusion criteria from enrollment to the study will be as follows; 1. Children with any disease that may affect eating behavior, nutritional status, and growth. 2. The children with a diagnosis of a disease mentioned below will be excluded from the study. 1. Children with a diagnosis of chronic infection / inflammatory diseases, 2. cystic fibrosis, 3. congenital heart disease, 4. chronic kidney failure, 5. diabetes, 6. gastroesophageal reflux, 7. dysfunction of swallowing, 8. anatomical, cognitive and/or impairment of speech, 9. autoimmune diseases (SLE, RA, thyroid, etc.), 10. congenital genetic diseases, 11. immune deficiency, 12. autism, 13. attention deficit hyperactivity, 14. manic-depressive disorders.

Study Design The study is planned to be a cross-sectional, case-control study and it will be carried out between October 2020 and November 2020 in our tertiary care center (university hospital located in Ankara, Turkey). The study will be conducted with the collaboration of the departments of Pediatric Immunology and Allergy and Nutrition and Dietetics. The study was approved by our University ethics committee (2011- KAEK-19) with the decision number of 108/2019. The children eligible for the study group will be enrolled from the pediatric allergy and immunology outpatient unit. The control group children will be selected from the health visitor clinics of Pediatrics. The patient informed consent form will be obtained from all children's parents at the beginning of the study.The study will be performed on Caucasian origin children who are among 2 to 6 years of age. The study group will be composed of children (n=31) who had CMA (Ig E-mediated and/or non-Ig E-mediated and/or mixed type) proved with oral food challenge tests in their early childhood (in ages of 0-2). The control group (n=31) will include healthy children who had never been on a diet throughout their lives. No children in the study and control groups will be on a dietary restriction during the study. The inclusion and the exclusion criteria are given in detail at the space for eligibility. Data collection The children's eating behavior will be evaluated with Turkish validated Children's Eating Behavior Questionnaire

• - (CEBQ) by interviewing mothers face to face.

The CEBQ is a Likert type, parent-report rating scale measuring the variation in eating behavior in children. The CEBQ consists of 35 items comprising eight subscales, each containing 3 to 6 items. Parents were asked to rate their child's eating behavior on a five-point scale (never, rarely, sometimes, often, always; 1-5, respectively). The 8 subscales of CEBQ and their interpretation are: The sub-scales Satiety Responsiveness (SR) (i.e., "My child has a big appetite", 7 items), Slowness in Eating (SE) (i.e., "My child eats slowly", 4 items), Emotional Undereating (EUE) (i.e., "My child eats less when she/he is tired", 4 items), and Food Fussiness (FF) (i.e., "My child refuses new foods at first", 3 items) assess "food avoidance" (i.e., increased internal satiety and avoidance of eating), while the sub-scales Food Responsiveness (FR) (i.e., "My child is always asking for food", 5 items), Enjoyment of Food (EF) (i.e., "My child loves food", 5 items), Desire to Drink (DD) (i.e., "My child is always asking for a drink", 3 items), and Emotional Overeating (EOE) (i.e., "My child eats more when worried", 4 items) assess "food approach" (i.e., high responsiveness to food). Higher scores indicate a stronger display of food approach or food avoidance (except FF) behavior. In the Turkish version of the CEBQ, a lower score for FF means a stronger display for fussy eating. Therefore, while calculating the food avoidance total score, reversed items of FF were summed with SR, SE, and EUE. The food approach total score will be calculated by the summation of FR, EF, DD, and EOE. Another questionnaire that will be conducted with the mothers will be to discuss their socio-demographic characteristics. Three days' food record will be obtained from each mother (2 weekdays and 1 weekend day). On the same days, the food consumed by children at school will be recorded by the teachers, and consumption registration forms will be combined at the end of three days. Portion sizes and volumes will be estimated with a portion size picture book, including 120 photographs of foods, each with 3-5 different portion sizes. In addition, each serves of participants will be confirmed with the pictures taken by the parents that will show the plates of their children before and after each meal. Only the forms accurately registered will be evaluated. BeBiS software version 7.2 will be used to calculate the daily intake of energy, macronutrients, micronutrients, and dairy products. The Nutrition Guide will be assessed the adequacy of children's nutrient intake for Turkey according to age and gender. The same researcher will take the body weights (kg) and height (cm) of the children with the same method, previously described by the World Health Organization (WHO) using the same measuring instruments. Measurements will be performed using the standardized Conformité Européene marked scales and stadiometers [A baby scale (Testut, Paris) will be used for infants weighing <15 kg and an electronic scale (Seca, Hamburg, Germany) will be used for children weighing >15 kg. Seca 213 and infantometer will be used for measuring participants' height]. Scale and stadiometer are routinely calibrated in our hospital according to rules of quality. Body Mass Index (BMI) will be calculated with the formula kg/m2. The anthropometric (height-for-age [HFA], weight-for-age [WFA], and body mass index-for-age [BMI]) measurements will be evaluated according to the Z-score using the WHO ANTHRO program (Version 3.2.2, January 2011) and WHO ANTHRO Plus Software (WHO, 2009b) [Z-score = Patient's value

• - Average value / Standard Deviation (SD)].

The Z-score (SDS) in the average child by age will be "0". Values between +2 SD and

• - 2 SD will be considered normal upper and lower limits.

Primarily, we will compare the eating behavior of children who had a strict CME diet due to CMA in early childhood with healthy children. Secondarily, we will evaluate the effects of children's eating behavior on participants' nutritional status and anthropometric measurements.

Arms

: Study Group

The study will be performed on Caucasian origin children who are among 2 to 6 years of age. The study group will be composed of children (n=31) who had CMA (Ig E-mediated and/or non-Ig E-mediated and/or mixed type) proved with oral food challenge tests in their early childhood (in ages of 0-2). The inclusion criteria to the study group will be to undergo a Cow's milk elimination (CME) diet or took a hypoallergenic formula in 0-2 years of age for at least 3 months or longer due to CMA allergy and improved afterward, and/or to eliminate other nutrients (e.g., eggs, potatoes, wheat flour, soybean, etc.) other than cow's milk between the ages of 0-2 for at least 3 months or longer, and/or to add these nutrients back to their diet in the last 3 months, and/or not receiving hypoallergenic formula for the last 3 months, not to be on the CME diet at present. Thus, no children in the study and control groups will be on a dietary restriction during the study.

Interventions

Other: - Survey

The children's eating behavior will be evaluated with Turkish validated Children's Eating Behavior Questionnaire - (CEBQ) by interviewing mothers face to face. The CEBQ is a Likert type, parent-report rating scale measuring the variation in eating behavior in children. The CEBQ consists of 35 items comprising eight subscales, each containing 3 to 6 items. Parents will be asked to rate their child's eating behavior on a five-point scale (never, rarely, sometimes, often, always; 1-5, respectively).