
Type 2 Diabetes Mellitus: A Review of Current Trends
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Introduction
Diabetes mellitus (DM) is probably one of the oldest diseases known to man. It was first reported in Egyptian manuscript about 3000 years ago.1 In 1936, the distinction between type 1 and type 2 DM was clearly made.2 Type 2 DM was first described as a component of metabolic syndrome in 1988.3 Type 2 DM (formerly known as non-insulin dependent DM) is the most common form of DM characterized by hyperglycemia, insulin resistance, and relative insulin deficiency.4 Type 2 DM results from interaction between genetic, environmental and behavioral risk factors.5,6
People living with type 2 DM are more vulnerable to various forms of both short- and long-term complications, which often lead to their premature death. This tendency of increased morbidity and mortality is seen in patients with type 2 DM because of the commonness of this type of DM, its insidious onset and late recognition, especially in resource-poor developing countries like Africa.7
Epidemiology
It is estimated that 366 million people had DM in 2011; by 2030 this would have risen to 552 million.8 The number of people with type 2 DM is increasing in every country with 80% of people with DM living in low- and middle-income countries. DM caused 4.6 million deaths in 2011.8 It is estimated that 439 million people would have type 2 DM by the year 2030.9 The incidence of type 2 DM varies substantially from one geographical region to the other as a result of environmental and lifestyle risk factors.10
Literature search has shown that there are few data available on the prevalence of type 2 DM in Africa as
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