Guide The epidemiology of diabetes mellitus

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High prevalence of neuropathy was also found in Sudan with a prevalence of This review shows that diabetes is a common health problem in Northern Africa. We observed a variation in diabetes prevalence between different countries in Northern Africa. Almost all the studies, which distinguished between urban and rural areas observed a higher diabetes prevalence in urban than in rural areas. Complications of diabetes are common in Northern Africa. This review has some limitations. The availability of data on the prevalence of diabetes in Northern Africa over the past twenty years is limited and therefore it was impossible to describe the trends of diabetes prevalence over time.

In the reviewed studies, different methods were used to diagnose diabetes.

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This could have led to differences in diabetes prevalence between Northern African countries. This also makes it impossible to carry out meta-analysis of the results.

In addition, the reviewed studies were conducted in different years, varying from to In order to make an accurate estimate of prevalence differences between countries, it would be ideal to compare studies conducted in the same period of time. This was impossible because of the limited availability of data on prevalence of diabetes in Northern Africa.

Despite these limitations, this current review still provides valuable information about one of the important chronic disease conditions and its complications in North Africa. Increasing urbanization and life expectancy are expected to lead to an increase in number of people with diabetes. The rising levels of urbanization are likely to lead to a high prevalence of obesity due to lifestyle changes such as changing diet and physical activity patterns.

Diabetes Mellitus: the increasing burden of disease in Kenya.

The Mediterranean diet patterns are considered as healthy and associated with decreased morbidity and mortality [ 28 ]. This diet is shifting towards a more westernized diet, which is associated with increased prevalence of diet-related conditions such as obesity. Dietary energy, measured in kilocalories per capita per day has been steadily increasing in all the North African countries [ 28 ]. Among the North African countries, the lowest intake of fat is found in Egypt while the highest intake is found in Libya [ 28 ]. For Libya, this finding is in line with the high prevalence of diabetes.

The fat intake in Egypt, however, contrasts the reported high prevalence of diabetes. This suggests that other factors might contribute to diabetes prevalence in Egypt.

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In one study, the prevalence of diabetes in people with higher socioeconomic status was the highest in the whole of Northern Africa. In addition, higher socioeconomic status was associated with decreased physical activity and increased prevalence of obesity [ 10 ]. This seems to suggest that the fat intake might differ across socio-economic and cultural groups in Egypt. The differences in diabetes prevalence between urban and rural areas in most Northern African countries indicate that urbanization is a major factor for the increasing prevalence of diabetes in North Africa [ 12 ].

The minor rural—urban difference in diabetes prevalence in Libya First of all, there have been rapid socioeconomic changes in Libya since the discovery of oil in Only little differences in housing, lifestyle and obesity between urban- and rural areas exist and essential food items are subsidized by the governance [ 11 ]. Because of the limited availability of data it is hard to describe trends of diabetes prevalence over time.

Nonetheless, one study in this review provided data on diabetes prevalence in and in in Tunisia. These data show a clear increase in the prevalence of diabetes between and For example, in the prevalence rates of diabetes in men were 2. In , however, the prevalence of diabetes was 4. Similar increases were also observed in women [ 13 ]. Diabetes prevalence in Northern Africa is at an intermediate to high level compared to Sub-Saharan Africa.

The prevalence of diabetes in Sudan and Morocco, which are countries with the lowest diabetes prevalence of this review, are in the same prevalence range as most countries in Sub-Saharan Africa [ 5 ]. Compared with diabetes prevalence found in the Arab States of the Gulf, diabetes prevalence in Northern Africa is intermediate. For example, high prevalence rates of diabetes were observed in Lebanon This high prevalence of undiagnosed diabetes is common in low- and middle-income countries, [ 17 ] and is found in urban as well as in rural areas.

This reflects on insufficient national diabetes programs in many low- and middle-income countries. Due to a lack of knowledge on diabetes, people do not recognize its symptoms and this may lead to delay in diagnosis. This review shows a high prevalence of chronic diabetes complications. The prevalence of microvascular complications was higher than previously observed in African countries [ 24 ].

It is very likely that poor metabolic control contributes to the higher prevalence of chronic diabetes complications since hyperglycaemia is significantly related to complications [ 23 ]. Poor metabolic controlled patients are common. Most patients were unaware of their complications and a high percentage of patients with severe complications were never seen by a specialist before [ 24 ]. In Tunisia, patients were screened for diabetes complications at the time of diagnosis.

The high prevalence of retinopathy, which is the most specific complication of hyperglycaemia, suggests a delay between the onset of diabetes and the time of diagnosis [ 26 ]. Patients lack of knowledge on diabetes complications may also contribute to the high rates of complications. The findings of this review have important policy implications for North Africa. Overall, less attention has been given to non-communicable diseases in North African countries by health planners as in other low- and middle- income countries [ 11 ].

Consequently, obesity, a major risk factor for diabetes is culturally prized in some social groups especially among those with less education [ 34 ]. In Libya, a national diabetes program has been ongoing since Diagnostic facilities, insulin and hypoglycemic medicine are available for free. Unfortunately, there are still many deficiencies in this diabetic program [ 11 ].

This review suggests that diabetes and related complications are common problem in Northern Africa and suggest an urgent need for action to prevent diabetes and its related sequelae in this world region.

The situation still requires more up-to-date research to help guide clinical and the preventive efforts. Estimates for the year and projections for Diabetes Care. Eur J Prev Rehabil. Nutr Rev.

Epidemiology of diabetes

A systematic review. BMC Public Health. Diabetes Metab. Diabet Med. J Hypertens. Eur J Clin Nutr.

Rev Epidemiol Sante Publique. Gharbi M, Akrout M, Zouari B: Prevalence and risk factors of non-insulin-dependent diabetes mellitus in the rural and urban population of Tunisia. Ophthalmic Res.

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J Stroke Cerebrovask Dis. East Mediterr Health J. Diabetes Res Clin Pract. Saudi Med J. Tunis Med. Public Health Nutr. J Intern Med. J Nutr. Download references. The authors thank the editors and reviewers for their useful suggestions, which helped to improve the earlier version of this manuscript.

Bagher Larejani 1 , Farzaneh Zahedi. Diabetes mellitus is a common disease and its incidence and prevalence are increasing in most populations.