Abstract
Purpose
The present study was performed to develop the Persian version of food craving inventory (FCI) (FCI-P) and to assess food craving in Iranian adult population. In addition, individual differences, including sex and body mass index (BMI) in food craving were assessed.
Methods
Eight hundred and twenty subjects who participated in the same study Hill (Proc Nutr Soc 66: 277–285, 2007) were studied (540 women and 280 men). The FCI-P, International Physical Activity Questionnaire (IPAQ), Three-Factor Eating Questionnaire (TFEQ), and a questionnaire pertaining to demographic characteristics were completed for all participants.
Results
Good content, construct, and convergent validity was observed for the FCI-P. A good reliability was found for both aggregate scores of the FCI-P and scores of its five factors. Exploratory factor analysis showed a five-factor model including “sweets,” “high-fat foods,” “fast food fats,” “carbohydrates/starches” and “high-fat meats”. These five factors accounted for 47.31% of the total variance. The scores of “uncontrolled eating” and “emotional eating” of the TFEQ were significantly correlated with the scores of the FCI-P factors and its total score. A significant correlation was found between BMI and the FCI-P score (r = 0.199). Significant differences were observed in the mean age and physical activity score among normal weight, overweight, and obese participants. Normal weight and overweight groups were more active than obese group. Obese participants had higher FCI-P score (P < 0.001) than the normal and overweight groups. FCI-P score was significantly higher in women than men.
Conclusions
FCI-P can be used as a valid and reliable measure to assess food craving in Iranian populations. Obese individuals experienced food craving more than normal weight subjects. Similarly, women may experience food craving more than men.
Level of evidence
Level V, cross sectional study.
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Introduction
Obesity is an important health problem in both developing and developed countries. The phenomena of calories in vs. calories out, which was previously thought to be a simple problem has now been turned into a complex and multifactorial condition that is influenced not only by genes but also by current obesogenic environment [1,2,3]. One of the most important factors in obesity is overeating in response to obesogenic environment in which, different highly palatable foods are available [4]. Some forms of overeating have the characteristics similar to addicted behavior. In recent years, the term “food addiction” has been used to refer to addictive-like eating behaviors [5]. There is an increasing evidence supporting the involvement of the “food addiction” in obesity severity and body composition [5,6,7]. “Food addiction” is associated with symptoms such as loss of control over eating, continued consumption in spite of negative consequences, and failure to cut down regardless the desire to do so [8].
Food craving is a core component of food addiction and is defined as “an intense desire to consume a particular food (or type of foods) that is difficult to resist” [9]. People frequently acknowledge food cravings as the reason for failure to adhere to diet [10]. Previous studies revealed that most of the people might experience craving for some kinds of food [11,12,13]. In normal‐weight subjects, food cravings is more often related to eating events, including breakfast, lunch and dinner, and food craving seen mostly for foods that are typically consumed at these eating events [13]. On the other hand, some studies have found that overweight and obese subjects experience food craving more frequently than normal ones [13,14,15]. It has been reported that the obesity prevalence is higher in women than in men [16,17,18]. Although sex differences in food craving may be one of the underlying mechanism explaining the difference in obesity prevalence among men and women [19]. There are relatively few studies which investigated the sex difference in food craving.
Since food craving is a potential risk factor for obesity, developing appropriate tools for measuring craving for different kinds of food is warranted. In this context, the Food Craving Inventory (FCI) has emerged as a psychometrically valid self-reported measure of specific food cravings [20].To date, the FCI has been translated into several languages, including British English [21], German [22], and Japanese [23]. It has been shown that the frequency, strength, and types of food cravings are different between communities and affected by culture [23, 24]. For instance, chocolate is the most craved food in the UK [23], while in Japan, the majority of people have craving for rice and sushi [20], and in Egypt, salty foods are the major targets for craving [25].
There are limited studies investigating the relationship between addictive-like eating, craving, and eating-related concerns. It has been shown that the frequency, strength, and types of food cravings are different between communities [23]. In addition, differences in the levels of physical activity may be a confounding factor in food choices and intake. Given the fact that there are differences across different countries in the frequency, strength, and types of food cravings, possibly because of the differences in ethnic, and cultural and social backgrounds, the present study was performed to develop the Persian version of food craving inventory (FCI-P) and to investigate the psychometric and measurement properties of it. In addition, we sought to assess whether individual differences, including sex and body mass index (BMI) are associated with the food craving measured by the FCI-P.
Materials and methods
Subjects and study design
This study was conducted in Tabriz, North-West of Iran, during December 2016 to August 2017. The subjects were those who participated in the same study reporting the validated Persian version of the Power of Food Scale [26] and the present one is a part of the already published study [26]. However, the present study presents new knowledge, including the development of the Persian version of food craving inventory (FCI-P) and the assessment of whether individual differences, including sex and body mass index (BMI) are associated with the food craving. In addition, any of the data presented in the previous article [26] is not repeat here, except age and BMI of the participants.
The subjects were recruited through announcements and flyer distribution in public areas of the city and health care centers. At the first visit, the aim of the study was described for the participants. The inclusion criteria were age between 19 and 50 years, and living in Tabriz for at least 5 consecutive years. Female participants were also required to be pre-menopausal as identified by the self-reporting of regular menstrual cycles and they were neither pregnant nor lactating at the time of the study. Subjects with any psychotic disorder, substance abuse, alcoholism, or a serious medical illness such as cardiovascular and/or endocrine diseases and those with significant weight loss during the last 6 months were excluded from the study. The initial sample consisted of 1050 adults and after eligibility screening according to the inclusion and exclusion criteria, 820 participants (540womenand280men) were included in the study. The FCI-P, the International Physical Activity Questionnaire [27], the Three-Factor Eating Questionnaire (TFEQ) [28] and a questionnaire pertaining to demographic characteristics were completed for the participants.
Anthropometric measurements
Participants’ weight and height were measured while wearing light clothes and shoeless after a 12-h fasting period. Weight was measured with a calibrated electronic scale (SECA Birmingham, UK) with an accuracy of 0.1 kg. A fixed stadiometer was used to measure height to the nearest 0.1 cm. BMI was calculated by dividing the participant’s weight in kilograms by the square of his/her height in meter (kg/m2).
Physical activity
Since differences in the levels of physical activity may be a confounding factor in food choices and intake, we studied the physical activity of the participants. The validated short form of the Persian version of the International Physical Activity Questionnaire [27, 29] was used to estimate the participant’s physical activity levels. According to the questionnaire, the participants were divided into low, moderate and high active groups [28]. The high active group was those with vigorous intensity activity on at least 3 days or five or more days of any combination of walking, moderate intensity or vigorous intensity activities. The moderate active group was those who engaged in 3 or more days of vigorous intensity activity and/or walking of at least 30 min per day, or 5 or more days of moderate intensity activity and/or walking of at least 30 min per day, or 5 or more days of any combination of walking, moderate intensity or vigorous intensity activities achieving a minimum total physical activity of at least 600 MET minutes a week. The low active group was the participants who did not meet any of the criteria for either moderate or high levels of physical activity [29].
FCI questionnaire
The FCI questionnaire was first developed, in 2002, by White et al., to measure cravings of different types of foods [30]. In the present study, the Persian version of FCI was developed which includes 28 food items in four groups: group (1) high fat foods (fried chicken, sausage, gravy, fried fish, bacon, corn bread, hot dog, and steak(, group (2) sweets (brownies, cookies, candy, chocolate, donuts, cake, cinnamon rolls, and ice cream), group (3) carbohydrates/starches (rolls, pancake waffles, biscuits, sandwich bread, rice, baked potato, pasta, and cereal), and group 4) fast food lipids (hamburger, French fries, chips, and pizza). Following instructions: ‘‘A craving is defined as an intense desire to eat a particular food that is so strong that you feel difficulty to resist eating’’ were appeared on the top of the questionnaire. The participants were asked to answer the question of "How often have you experienced a craving for the food listed below over the past month?". The subjects were required to respond the questions using a five-point scale, scoring from 0 to 4, where 0 = never; 1 = rarely; 2 = sometimes; 3 = often; and 4 = always/almost every day) based on the craving intensity.
Validation procedure
Translation process
The English version of the FCI was translated into Persian according to the standardized cross-cultural translation guidelines project [31]. The translation was performed by two independent native Persian speakers who were fluent in English and expert in food eating behavior. The translators discussed their translations and provided an agreed translation. Then, the Persian version of the questionnaire was back translated into English by a third translator who was not aware of the original English version. Finally, the forward–backward and original versions of the questionnaire were compared to obtain a final FCI-P.
Original English version of FCI conveys some food items that are not common in Iranian food culture. These items were assessed by a 10-member panel of academic professionals in the field of nutrition and eating behavior. According to the consensus of the professional panel, food items that were not consistent with Iranian food culture were replaced by popular foods in the studied community. Finally, a preliminary questionnaire with 42 food items was obtained.
Content validity
The content validity of the FCI-P was assessed based on the feedback of a 10-member team experienced in the field of nutrition and food behaviors. They were asked to evaluate the questionnaire qualitatively in terms of the Persian grammar, appropriate word usage, and locating food items in their proper place and then score each item. Considering the team feedback, some modifications were applied which includes removal of some food items from the questionnaire or combination in one food group because of their high similarity. For instance, "Donar Kebab", a highly popular food in Tabriz, and other types of "Kebab" such as "Kebab Koobideh", "Kebab Barg", “Kebab Bonanb”, etc. were considered as a single food group of "Kebabs". Salty/crunchy items such as "Chips" and "Poffak" were regarded as a food group of “junk foods ". In addition, some food items that were not common in Iranian food culture were replaced by those which are popular among Iranians. For instance, "gravy" was substituted by "Abgoosht". Ultimately, a 28 food item questionnaire was achieved. For quantitative assessment, Content Validity Ratio and Content Validity Index were calculated.
Face validity
To assess the face validity, the final Persian version of the questionnaire with 28 food items (FCI-P) was administered to 30 subjects to assess the difficulty, irrelevancy and ambiguous of the questions. Based on this survey, some required modifications were applied.
Construct validity
The factor structure of the FCI-P was examined using the exploratory factor analysis (EFA) utilizing principal axis factoring and oblimin rotation [21, 22]. A factor loading value of 0.4 was used to allocate an item to the factor. To have a satisfactory factor analysis, the Kaiser–Meyer–Olkin values of > 0.7 and significance of Bartlett’s test of sphericity (P < 0.05) were used [22]. To confirm the adequacy of the EFA extracted model to the observed data, a confirmatory factor analysis (CFA) was applied. The CFA was carried out on a separate sample, including 100 men and 200 women. In the CFA, the method of weighted least squares for estimation was used. The fit indices and reasonable values of them for the CFA were a Chi-squared to degree of freedom ratio of < 5, root mean square error of approximation of < 0.08, and comparative fit index, and non-normed fit index of > 0.9 [32, 33].
Convergent validity
According to the original FCI validation, we used the TFEQ as a measure of convergent validity. The TFEQ is one of the most widely used instruments for assessing eating behavior worldwide. Therefore, the Persian version of the TFEQ [27] was used in the present study. The questionnaire consists of three subscales measuring "uncontrolled eating", "emotional eating" and "cognitive restraint". It consists of 18 items which are responded on a four-point scale (definitely true/mostly true/mostly false/definitely false). The scores of the items are then summated into the scale scores. Previous studies showed that “uncontrolled eating" and "emotional eating" scales correlated with food craving, but "cognitive restraint” did not [20, 22, 30, 34].
Reliability
Test–retest reliability and internal consistency were used to assess the reliability of the FCI-P. Forty subjects, including 15 men and 25 women completed the questionnaire twice, with a 2-week interval. The intraclass correlation coefficient (ICC) and its confidence interval were obtained for each item. For internal consistency, the Cronbach's alpha coefficient was calculated for the whole questionnaire and its factors separately.
Statistical analysis
Version 23.0 of SPSS software and version 23.0 of Amos software were used to analyze data. Descriptive results are presented as arithmetic mean ± SD and frequency (%). The normality of the distribution of data was assesses using skewness (absolute values < 3) and kurtosis (absolute values < 10) [35, 36]. Each domain was scored by averaging the scores of the related questions of that domain. The missing data were imputed using multiple imputation method utilizing the MCMC procedure. Pearson correlation was used to assess the relationship between questionnaires scales and BMI. Participants were categorized to three group based on their BMI as normal (≥ 18.5 and < 25), overweight (≥ 25 and < 30), and obese (≥ 30). The comparisons between three groups were conducted using analysis of covariance with the age and sex as covariates. The Sidak post hoc test was used as post hoc test. In addition, sex differences in the scores of FCI-I were examined using the Student’s t test. A p value of less than 0.05 was considered statistically significant.
Results
All data were normally distributed and about 66% (540subjects) of the participants were women. The mean age of the men and women were 35.99 ± 8.02 and 35.93 ± 8.91 years, respectively (p = 0.92). There was a statistically significant difference in the BMI between men (28.36 ± 3.95 kg/m2) and women (30.50 ± 6.62 kg/m2) (p < 0.001). The obtained 28 item FCI-P (see the sections of face and content validity) were entered into the factor analysis. The adequacy of the factor model was confirmed by the value of 0.877 for the Kaiser–Meyer–Olkin values and p < 0.05 for the Bartlett’s test. Table 1 shows the rotated factor loadings. Principal axis factoring and oblimin rotation revealed a five-factor model including “sweets,” “high-fat foods,” “fast food fats,” “carbohydrates/starches” and “high-fat meats”. These five factors accounted for 47.31% of the total variance. “Tah-dig” and “Nuts” were excluded from the final list of items because of the coefficient point lower than 0.4 and FCI-P was obtained with 26 food item. In addition, the five-factor structure obtained in the EFA was approved by the CFA using a structural equation modeling procedure, which was performed in a separate sample (100 men and 200 women). The results of CFA for both original version of FCI with four factors and the exploratory version with five factors proposed by the EFA are presented in Table 2. The Comparison of the modal fit of these two versions indicated that the exploratory version was well-adjusted. We used multigroup CFA to examine the extent of measurement invariance between men and women. No significant difference was observed, and thus the homogenous structure could be inferred.
Table 3 shows the correlation of the five factors of FCI-P with the three subscales of the TFEQ (convergent validity) and BMI. The scores of “uncontrolled eating” and “emotional eating” of the TFEQ significantly correlated with the scores of the FCI-P factors and its total score. Although, such a correlation was not found for “cognitive restraint”, a weak correlation was found between this scale and fast food fat. Also, BMI significantly correlated with the scores of the FCI-P factors and its total score.
The 10 food items with the highest mean score are illustrated in Fig. 1. As seen, carbohydrates and sweets are at first and second place in the list. "Bread", "rice", and "candies" were the most frequently craved foods with the 2.54, 2.48, and 2.07, scores, respectively.
Table 4 indicates the comparison of food craving between the normal weight, overweight, and obese participants after adjusting for age, sex and physical activity. Significant differences were observed in the mean age and physical activity score among normal weight, overweight, and obese participants. Normal weight and overweight groups were more active than obese group. There were significant differences the total score of FCI-P and its factors between the groups, with the exception for sweets. The least significant difference, as post hoc test, showed significant differences between three groups in food craving total scores.
To examine sex-based food preferences and to compare the scores of men and women in each factor of the FCI-P a series of covariance analysis, adjusted for BMI and physical activity was conducted. As indicated in Table 5, women scored significantly higher on craving for sweets, fast food fat, and carbohydrate/starch. Whereas, the high fat and meat fat subscales were significantly higher in men compared to women. In general, the total score of food craving was remarkably higher in women than men.
The reliability analysis of the FCI-P showed the Cronbach’s alpha values of 0.80 for the total score, 0.80 for “sweets”, 0.72 for “high-fat foods”, 0.79 for “fast food fats”, 0.70 for “carbohydrates/starches”, and 0.70 for “high-fat meats”. Satisfactory internal consistency and ICC (ranged from 0.72 to 0.95) were observed for all factors. These results supported the test–retest reliability of the FCI-P.
Discussion
The present study was performed to develop the Persian version of FCI (FCI-P) and to investigate food craving among an Iranian sample. The studied participants were those who participated in the same study to validate the Persian version of power of food scale [26]. The present study showed that food craving would give rise to obesity and there is sex differences in food craving, which may highlight documented sex differences in obesity prevalence. The FCI-P can be used to identify food craving behavior in Iranian populations. In addition, the present study, provides more evidence that the application of FCI may be useful in understanding the complex etiology of obesity and improving weight loss programs and weight maintenance.
Given the fact that, food patterns of Asian countries varies from that of Western countries, it was not surprising that some food items in the original version of FCI seemed to be unfamiliar to Iranian people. These food items were identified by a panel of experts and replaced by those that are common in the studied community. After the validation procedure, the final version of the FCI-P was obtained with 26 food items which was categorized in five factors, including “sweets,” “carbohydrates/starches,” “high-fat foods,” “high-fat meats” and “fast food fats” that were largely similar to those in the original version of FCI [30]; however, the high fat foods were loaded in two factors, including high-fat foods and high-fat meats. Although, the high-fat meats can also be considered as traditional foods, they were named as “high-fat meats” to match more with the original factors. In a study in Japan, food craving investigation by 21-item FCI-J, also revealed five factors structure that the two factors of “rice” and “sushi” were Japanese traditional foods [20]. A study in Brazil reported a 23 item FCI-Br, distributed in three factors: “high Fat”, “sweet food”, and” traditional meal” without a specific factor for carbohydrates/starches and “traditional meal” dimension was composed of carbohydrates, beans, meat, and cheese [37]. The Spanish version of the FCI was consisted of 28 items and five factors in which high fat foods and fast food fats were loaded in one factor [38]. A brief review of different versions of the FCI questionnaire as well as the one designed in this study indicated that the sweet foods dimension remains stable compared to the other dimensions [20, 21, 30, 37, 38]. Moreover, the results of the CFA confirmed the fit indices of the exploratory model in present study (Table 2). The test–retest and ICC analyses showed acceptable reliability for the FCI-P factors and its total score. The criterion validity of the FCI-P was confirmed by the strong correlations between the factors of FCI-P and its total score with the two subscales of the Three-Factor Eating Questionnaire, “uncontrolled eating” and “emotional eating” [22]. In line with previous studies [30, 34], no significant correlation was found between the total score of the FCI-P and “cognitive restraint”. Overall, the results indicated that the FCI-P was satisfactory in terms of its content, construct, and criterion validations.
People in diverse cultures tend to eat different foods and, therefore, crave for various foods [39]. For instance, compared to Japanese young females, Spanish people have more craving for white chocolate [20]. In the present study, bread and rice were the most frequent craved foods, a findings that is in line with the Komatsu’s conclusion who showed that rice craving is a characteristic of Asian rice consuming countries [20]. Like many other Asian countries, bread and rice are the most preferred staple in Iran which provide main proportions of calorie intake among Iranians [40, 41]. In addition, with an average annual per capita consumption of about 34 kg, Iran is the 3rd biggest consumer of white rice in the world [42]. Recent studies have suggested that more craving lead to higher intake of the craved foods [43,44,45]. For instance, Martin et al., investigated the association between food cravings and intake of specific foods in a laboratory setting. They found that food craving for a given food, measured by the FCI, was significantly related to the consumption of that food or similar foods. For instance, a person who was craved for sweets consumed more jelly or M&M than other participants (45). Thus, strong associations between food craving, increased food intake and weight gain as a consequence has been demonstrated [46,47,48]. In agreement with other studies [14, 49], in the present study, significant correlations were observed between BMI and the factors of FCI-P as well as its total score; Craving for carbohydrate/starch showed the strongest correlation with BMI. Furthermore, there were significant differences in food craving total score and craved foods between normal weight, overweight, and obese participants, except for sweets. These findings are in accordance with recent studies indicating that self-reported food cravings are usually more among overweight and obese individuals compared to normal weight participants [50,51,52]. It has also been reported that craving plays a major role in food addiction process ending in excessive food consumption which in turn increase weight gain in a subset of obese population [50, 53,54,55,56]. Furthermore, several studies have indicated that obesity is associated with reduced dopaminergic receptor, an important element of the brain reward system, which is correlated with addictive-like eating [57,58,59,60].
Several factors such as the level of nutrition awareness, cultural background, psychological or physiological changes related to menstruation, and differences in dietary and mood-regulating neurotransmitters may lead to sex differences in eating behaviors and food cravings severity [61, 62]. According to some studies, there are sex differences in general food cravings prevalence; being more common in women than men [12, 63, 64]. Similarly, women experienced more food craving than men in the present study which might be explained partially, by the fact that women have greater neural activation in brain regions associated with food cues and reward eating [65, 66]. In this regard, some studies also reported more craving for sweets and carbohydrates in women [12, 63, 67]. Consistent with other studies, women craved also more for sweets, carbohydrate/starch and fast food fat in the present study [19, 68, 69]. Although sweet taste preference is innate in humans, and usually is accompanied by "hedonic reward", the remarkable sweet preferences in women appear to correlate strongly with hormonal changes [61, 70,71,72,73]. As well, the food items included in the high fat meats (e.g., fried fish, Kebabs, fried chicken, and Abgoosht) could be considered as Iranian traditional meals. These kinds of food usually content high fats and interestingly, the both factors scores of high fats and high fat meats were higher in male participants which in line with the previous studies [19, 65, 66]. Higher score of food craving in women than men confirmed the discriminant validity of the FCI-P [21, 38].
Large sample size, especially for women participants which provided adequate statistical power for factor analysis was one of the strengths of the present study. The wide ranges of subjects’ age and BMI could be considered as another strength point of the present study. However, the inequality of male and female participants’ number was one of the limitations. In addition, since this study was carried out in Tabriz, one of the major cities in northwest of Iran, further studies with larger sample sizes in different parts of Iran are recommended to assess Iranian populations’ food craving. Another limitation was the use of a same population to validate two different questionnaires, including power of food scale [26] and food craving inventory. Therefore, further studies considering these limitations are recommended to assess food craving in different cultures and to assess food craving along with food intake to finding out that whether and to what extent food craving can affect food intake in people.
What is already known on this subject?
Food craving is associated with food intake and obesity. The type and intensity of food craving are much depended on food culture and may be different between communities. In addition, few studies showed that gender may affect food craving.
What does this study add?
For the first time, food craving inventory was evaluated in an Iranian population. Obese individuals experienced more food craving than normal weight subjects. In addition, this study provide further evidence in favor of sex differences in food craving.
Conclusions
The findings of this study suggest that food craving would give rise to obesity. In addition, we observed sex differences in food craving, which may highlight documented sex differences in obesity prevalence. Regarding obesity as one of the greatest and most preventable global threats and food craving as the main reason of diet programs failure, application of FCI may be useful in understanding the complex etiology of obesity and improving weight loss programs and weight maintenance. The psychometric properties of the FCI-P were confirmed. It can be used to identify food craving behavior in Iranian populations. Women had higher scores in food craving compared to men. Therefore, food craving would be considered as a reason for higher prevalence of obesity in women.
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The authors thank the participants for their time, patience, and cooperation.
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This work was supported by the Tabriz University of Medical Sciences, Vice Chancellor for Research Affairs [grant number: 5/D/996710].
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Aliasghari, F., Jafarabadi, M.A., Yaghin, N.L. et al. The food craving inventory in an Iranian population: post-hoc validation and individual differences. Eat Weight Disord 26, 1529–1539 (2021). https://doi.org/10.1007/s40519-020-00976-7
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DOI: https://doi.org/10.1007/s40519-020-00976-7