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Death rate from obesity, 2019. Obesity is a risk factor for many chronic physical and mental illnesses.. The health effects of being overweight but not obese are controversial, with some studies showing that the mortality rate for individuals who are classified as overweight (BMI 25.0 to 29.9) may actually be lower than for those with an ideal weight (BMI 18.5 to 24.9). [1]
An adult BMI of 18.5 kg/m 2, considered 'normal' by WHO criteria, is associated with a 30% increase in all-cause mortality. Figure 2: The association between body mass index (BMI) and relative risk of all-cause mortality (data from Aune et al., BMJ 2016; curve fitting by L. Stalpers, Amsterdam UMC, 2023).
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
A body mass index in the range considered overweight is not necessarily associated with a higher risk of death, ... adults, a BMI of 27.5 to 29.9 was also associated with a nearly 20% greater risk ...
Obesity is a leading preventable cause of death worldwide, with increasing rates in adults and children. [18] In 2022, over 1 billion people lived with obesity worldwide (879 million adults and 159 million children), representing more than a double of adult cases (and four times higher than cases among children) registered in 1990.
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The number of Canadians who are obese has risen dramatically in recent years. In 2004, direct measurements of height and weight found 23.1% of Canadians older than 18 had a BMI greater than 30. When broken down into degrees of obesity, 15.2% were class I (BMI 30–34.9), 5.1% were class II (BMI 35–39.9), and 2.7%, class III (BMI ≥ 40).
Traditionally aging is not considered as a cause of death. It is believed that there is always a more direct cause, and usually it is one of many age-related diseases . It is estimated that, as a root cause, the aging process underlies 2/3 of all death in the world (approximately 100,000 people per day in 2007).