Background

Obesity is often defined as a condition of abnormal and excessive fat accumulation in adipose tissue to the extent that health may be adversely affected [1]. The prevalence of obesity is increasing worldwide at an alarming rate in both developing and developed countries. It has become a serious epidemic health problem, estimated to be the fifth leading cause of mortality at global level [2]. Moreover, it is a risk factor for many diseases such as certain cancers, hypertension, type II diabetes mellitus, dyslipidemia, metabolic syndrome and coronary heart disease [3–6]. The rapid cultural and social changes that have occurred in the Arabian Gulf region, since the discovery of oil and the economic boom during the 1970's and 1980's, were associated with an alarming increase in obesity [7–11]. One of the major causes of obesity is the changes in the diet, in terms of quantity and quality, which has become more "Westernized" [12]. In the Kingdom of Saudi Arabia (KSA), recent studies revealed increasing consumption of animal products and refined foods in the diet at the expense of vegetables and fruits [13, 14]. These dietary changes were accused for increasing the prevalence of both overweight and obesity observed among Saudi children, adolescences and adults in the last few decades [15–18].

College students are highly exposed to unhealthy eating habits leading to body weight gain [19]. According to WHO, obesity is generally more common among women than men [1]. However, studies on college students revealed higher rates of obesity in males than in females [19, 20]. In KSA, Rasheed et al [21] documented that 30.6% of female health college students were either overweight or obese. In contrast, no study was found in our literature search regarding obesity prevalence in Saudi male college students. Therefore, the aim of the current work is to assess overweight and obesity rates among male college students in KSA and to correlate their body weight status and composition with their eating habits.

Methods

Design and Sample

A cross sectional study was conducted in College of Health Sciences at Rass, Qassim University, KSA during the spring semester of 2009. A total number of 357 male students aged 18-24 years had participated in the study after signing a written consent form according to Helsinki Declaration. All of the participants were Saudi of the Arabian ethnicity and were chosen by the stratified random sampling method by department and class year. The response rate among students was 96.5%. The study was approved by the committee of research ethics in Qassim University.

Data Collection

Self-reported questionnaire and anthropometric measurements were used for data collection. The questionnaire was designed to study eating, drinking, and smoking habits among college students, and its use in that respect had been standardized [20, 22, 23]. Prior to filling out the questionnaire, the students were informed about the study and were given instructions on how to fill out the questionnaire completely and truthfully. Anthropometric measurements including height, weight, body mass index (BMI), body fat percent (BF%), and visceral fat level (VFL), were conducted. Weight, BMI, BF%, and VFL were determined using a bioelectrical impedance analysis (BIA) device: Omron body composition monitor (BF500, Omron Healthcare Co. Ltd., Kyoto, Japan) [24]. As fluctuations in body water content affect body composition, measurements were taken in the morning when the students remain without eating, drinking, bathing or exercising for at least two hours. Following the manufacturer's instructions, students were asked to wipe off the sole of their feet before stepping onto the measuring platform as unclean foot pads interfere with the device conductivity. Digital Physician Scale (MDW-250L, Adam Equipment Co. Ltd., UK) was used for measuring height, where students were asked to take off their shoes and socks and stand straight, with the head in the Frankfurt plane, feet together, knees straight, and heels, buttocks, and shoulder blades are in contact with the vertical surface of the scale [25].

Body mass index (BMI), which is the ratio of weight in kilogram to height in meter square, was used to assess body weight status. According to the National Institutes of Health (NIH), adults were classified based on their BMI to underweight (BMI < 18.5), normal (BMI = 18.5-24.9), overweight (BMI = 25-29.9), or obese (BMI ≥ 30). Furthermore, obesity was subdivided to three grades: Grade 1 (BMI = 30-34.9), Grade 2 (BMI = 35-39.9) and Grade 3 or extreme obesity (BMI ≥ 40) [26]. Taking in consideration age and gender, the participants were classified as having low (BF% < 8), normal (BF% = 8-19.9), high (BF% = 20-24.9), or very high (BF% ≥ 25) body fat [27]. Visceral fat was also measured and the students were categorized as having normal (VFL = 1-9) or high (VFL = 10-30) visceral fat [28].

Data Analysis

The Statistical Package for Social Sciences (SPSS Inc., Chicago, IL, USA) version 17 was used for data analysis. Results were expressed as means ± standard deviations. All of the analyzed variables were non-parametric and were tested using Chi-squared tests. All reported P values were made on the basis of two-tailed tests. Differences were considered statistically significant at P value < 0.05.

Results

Students' characteristics

A total of 357 male students, with an average age of 20.4 ± 1.3 years, participated in the current study. The mean weight and height of the students were respectively 69.9 ± 15.6 kg and 168.8 ± 6.1 cm. The average BMI, BF% and VFL of the participants were respectively 24.6 ± 5.2, 22.4 ± 9.2 and 6.5 ± 4.3 (Table 1).

Table 1 Characteristics of the participants (means ± SD).
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Anthropometry

The measurements of BMI indicated that the majority of students (57.4%) had normal weight. Overweight and obese subjects represented 21.8% and 15.7% of the students respectively, compared to 5.0% for underweight subjects. Most of the obese students (11.5% of all participants) fall in grade 1 obesity whereas, grade 2 and grade 3 obese students represented 3.4% and 0.8% of the whole sample, respectively (Table 2). Based on BF%, 41.7% of the students had normal body fat, which was low in 3.1%, high in 16.8% and very high in 38.4% of them (Table 3). Visceral fat was normal in more than three fourth of the participants (78.2%) (Table 4). The correlations among these anthropometric measurements (BMI, BF% and VFL) were found to be direct and significant (P < 0.001). Body fat exceeded its normal limits not only in all overweight and obese subjects, but also in 30.7% of those with normal BMI. In contrast, high levels of visceral fat were observed in all obese and in 28.2% of the overweight students. Moreover, these high VFL's were confined to 56.9% of students with very high BF% (Table 5).

Table 2 Prevalence of obesity among participants based on BMI categories [Total (Percent)] and their mean and range BF% and VFL.
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Table 3 Prevalence of obesity based on BMI categories cross tabulated with BF% categories [Total (Percent)].
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Table 4 Prevalence of obesity based on BMI categories cross tabulated with VFL categories [Total (Percent)].
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Table 5 BF% categories cross tabulated with VFL categories [Total (Percent)].
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Eating habits

Although irregular meals consumption was reported in 63.3% of students, the vast majority of them (88.6%) have breakfast at least three times per week. Most of the participants (55.7%) eat two meals per day, while 31.4% of them eat three meals. Eating snacks was a common habit among students and its daily consumption was reported in 31.7% of them. With the exception of dates which are taken at least three times weekly by 60.5% of students, vegetables and fruits were not frequently consumed. In fact the percentage of students who rarely eat vegetables and fruits were respectively 32.2 and 36.1, and those who eat them once or twice per week were 32.2% and 40.3%. Almost half of participants (46.8%) eat fried foods at least thrice a week. Sharing meals with family was a common habit among the students; 66.4% of them eat daily with their families. In addition, the majority of students (59.7%) was aware of the types of food they should eat in order to have a balanced nutrition. We also found that 86.8% of the students were non-smokers and 95.8% of them never drink alcohol (Table 6).

Table 6 Participants response for eating, drinking and smoking habits questionnaire.
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Correlations between anthropometry and eating habits

Correlating students anthropometric measurements with their eating habits (Tables 7, 8 and 9) revealed that both BMI and VFL had significant inverse correlations with the frequency of eating with family (P = 0.005 and 0.007 respectively). Similar correlations were also found between BMI and snacks consumption rate (P = 0.018), as well as, between VFL and the frequency of eating dates (P = 0.013).

Table 7 Correlations between BMI categories and eating habits [Total (Percent)].
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Table 8 Correlations between BF% categories and eating habits [Total (Percent)].
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Table 9 Correlations between VFL categories and eating habits [Total (Percent)].
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Discussion

The purpose of this study was to assess overweight and obesity rates among male college students in KSA and to correlate their body weight status and composition with their eating habits. The current data demonstrated that more than one third of the students were above the normal body weight. Overweight students represented 21.8% of the sample whereas, 15.7% were obese. These findings were consistent with the results of similar studies in other Middle East and some Western countries. In Lebanon, the prevalence of overweight and obesity among male college students was 37.5% and 12.5%, respectively [20]. In Kuwait the corresponding percentages were 32% and 8.9% [29], while in the United States and the United Arab Emirates overweight and obese accounted for about 35% of the male college students [19, 30, 31]. In contrast, only 7.9% of Iranian male college students were above the normal body weight [32]. That rate decreased to 2.9% among Chinese college students with a percentage of obesity as low as 0.4 [23]. Despite the small sample sizes and the fact that self-reported height and weight were used in some of the above mentioned studies, their findings still reflect differences in the severity of obesity problems among young adults across nations.

Recently, obesity has been defined in terms of adiposity, rather than the relation of body weight to height and, in turn, body composition became a more desirable determinant of obesity than BMI [33, 34]. That goes well with our results which confirmed that 38.4% of students are obese according to their BF% compared to 15.7% on basis of their BMI. The present work also demonstrated that the total body fat exceeded its normal values in more than half of the participants and the VFL was elevated in more than one fifth of them. Compared to those of similar studies, our results also revealed that normal, overweight and obese Saudi college students have on average more fat in their bodies than their Lebanese fellows [20], and their average BF% was higher than that in USA male college students of different ethnicities [35]. Moreover statistical analysis of the current data showed linear relationship between BF% and VFL among students. Health threatening values of VFL (≥ 10) were only found in subjects with very high BF% (≥ 25) and showed up in all obese and more than one fourth of overweight students. In literature, visceral fat has been closely linked to non-communicable diseases such as type II diabetes mellitus and coronary heart disease [36, 37]. Therefore, urgent dietary management going hand in hand with regular medical follow up should be considered to overcome or, at least, minimize the risk of the above mentioned diseases in Saudi college students with high VFL [38].

The results of our study showed that most of the students have irregular meals with two main meals per day. With the exception of dates, which are a staple food in KSA, the majority of the students eat vegetables and fruits twice per week in maximum. As well, about half of the students eat fried foods three times per week in minimum. These habits need to be corrected using educational programs to promote healthy eating habits in KSA. On the other hand, most of the students take breakfast and snacks daily, eat with their families, are aware of the balanced nutrition and never smoke or drink alcohol. These habits ought to be encouraged. Comparing our results with equivalent studies from Lebanon and China [20, 23], for students of the same gender, revealed diversity in eating habits among male college students in different societies. Most of Saudi students (63.3%) eat irregular meals while 64.6% of Lebanese and 81.6% of Chinese male students take regular meals. About half of Saudi students have breakfast daily compared to one third of Lebanese and two thirds of Chinese students. In KSA and Lebanon most of students (55.7% and 47.9% respectively) eat only two meals per day. In contrast, the vast majority of Chinese students (74.3%) eat meals thrice a day. Eating snacks was a daily habit in about one third of Saudi, half of Lebanese and only about one tenth of Chinese college students. Vegetables and fruits consumption was uncommon habit among Saudi students. On the other hand, 83.5% of Chinese and 56.3% of Lebanese male students consume vegetables three times or more per week. Moreover, 49% of Lebanese students eat fruits at the same rate. Most Saudi and Lebanese students eat with family, while most Chinese students eat alone.

It is well documented that vegetables and fruits are low in energy density because of their high water and fiber content. Therefore, adding them to a diet reduces its overall energy intake, thus, helping in weight management [39]. However, the current data showed insignificant (P > 0.05) correlation between BMI, BF% or VFL on one hand and vegetables and fruits consumption on the other hand. That could be explained by two factors; 1) inadequate intake of these foods and 2) the unhealthy habits entitled in their consumption. Eating raw vegetables and fruits in the course of a meal is uncommon among Saudi population. In addition, the vegetables content in most of the traditional Saudi dishes (e.g. Kabsa, Margog, Mandy) is too small to have an impact on the overall energy density of the diet. Moreover, fruits are usually taken as a dessert at the end of meals, thus, losing their "satiety effect" that tends to lower the overall energy intake of the diet. The term "snack" refers to all foods and drinks taken outside the context of the three main meals [40]. Although increased snacks consumption is often accused for increased prevalence of obesity, yet, a clear cut relation between snacking and BMI is still unsettled. Spanos and Hankey [41] examined the habitual meal and snaking patterns of university students and found no correlation between BMI and snacking. On the other hand, de Graaf [40] reported that snacks consumption may contribute to a positive energy balance and increased body weight. Contrarily, results of the present study revealed an inverse relationship between BMI and snacks eating rate. That can be explained by the high-calorie larger meals taken by the students in absence of snacks. This is supported by several epidemiological studies, as cited by Bellisle et al [42], which revealed an inverse relationship between habitual frequency of eating and BMI, leading to the assumption that increased eating of both meals and snacks frequency i.e. "nibbling meal pattern" helps in avoidance of obesity rather than the "gorging meal pattern". Moreover, a recent study on rats demonstrated that obesity development is associated with increased Calories per meal rather than per day, suggesting that the large size of meal, but not the overnutrition, could be responsible for obesity [43]. Similarly, significant inverse correlations were detected between both BMI and VFL, and the frequency of eating with family. This could be due to the fact that students, eating away from home, depend mainly on fast food high in Calories and fats and low in vegetables and fruits. This is supported by the results of earlier studies which reported that diets of the university students living away from the family are characterized by a number of undesirable practices affecting their healthy lifestyles. Significant decrease in the consumption of fruits, fresh and cooked vegetables, seafood and pulses together with increased intake of sugar and fast foods were the major dietary changes reported for university students living away from the family home. In addition, it has been suggested that the lack of experience in planning meals, and assuming responsibility for food purchasing and preparing for the first time are the main factors underlying the unhealthier dietary choices of these students [44, 45]. Moreover, a unique finding in the present work was the significant inverse correlation between VFL and dates eating frequency. Dates are one of the main fruits frequently consumed by Saudis as snacks between meals and prior to main meals on social gatherings. It is well known that consuming the whole fruits promotes satiety and reduces energy intake at the next meal [39]. This may explain the inverse correlation between VFL and the frequency of dates consumption.

Conclusions

In short, our findings showed high rates of overweight and obesity among male college students in KSA. Furthermore, BF% was elevated among more students, increasing the obesity prevalence by more than two times when used for defining adiposity rather than BMI. In contrast, the majority of the students possess normal VFL. High VFL's were encountered only in the extremely overweight and obese participants and, thus, can be used as a warning indicator for life threatening health problems associated with obesity such as diabetes and heart attack. Irregular and infrequent meals together with low vegetables and fruits intake were the most common unhealthy eating habits of the participants. Eating with family and frequent snacking were found to have a negative effect on BMI. Furthermore, VFL was inversely correlated with the frequency of both eating with family and dates' consumption. The university and college arenas represent the final opportunity for nutritional education of a large number of students. Our findings suggest the need for strategies and coordinated efforts at all levels (family, university, community and government) to reduce the tendency of overweight and obesity among college students and to promote healthy eating habits in our youth.