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The normal human body temperature is often stated as 36.5–37.5 °C (97.7–99.5 °F). [8] [9] In adults a review of the literature has found a wider range of 33.2–38.2 °C (91.8–100.8 °F) for normal temperatures, depending on the gender and location measured. [14]
In humans, hyperthermia is defined as a temperature greater than 37.5–38.3 °C (99.5–100.9 °F), depending on the reference used, that occurs without a change in the body's temperature set point. [3] [10] The normal human body temperature can be as high as 37.7 °C (99.9 °F) in the late afternoon. [2]
On the other hand, a "normal" temperature may be a fever, if it is unusually high for that person; for example, medically frail elderly people have a decreased ability to generate body heat, so a "normal" temperature of 37.3 °C (99.1 °F) may represent a clinically significant fever. [37] [39]
In 2014, more than 600 million adults were obese, equal to about 13 percent of the world's adult population, [218] with that figure growing to 16% by 2022, according to the World Health Organisation [219] The percentage of adults affected in the United States as of 2015–2016 is about 39.6% overall (37.9% of males and 41.1% of females). [220]
It is estimated that the worldwide average height for an adult human male is about 171 cm (5 ft 7 in), while the worldwide average height for adult human females is about 159 cm (5 ft 3 in). [158] Shrinkage of stature may begin in middle age in some individuals but tends to be typical in the extremely aged. [159]
As of June 2021, 1.9 billion adults were overweight or obese, and 462 million adults were underweight. [26] Globally, two billion people had iodine deficiency in 2017. [ 36 ] In 2020, 900 million women and children had anemia, which is often caused by iron deficiency. [ 37 ]
Share of adults that are obese, 1975 to 2016. Obesity is common in the United States and is a major health issue associated with numerous diseases, specifically an increased risk of certain types of cancer, coronary artery disease, type 2 diabetes, stroke, and cardiovascular disease, as well as significant increases in early mortality and economic costs. [1]
A child's perception of external pressure to achieve the ideal body that is represented by the media predicts the child's body image dissatisfaction, body dysmorphic disorder and an eating disorder. [136] "The cultural pressure on men and women to be 'perfect' is an important predisposing factor for the development of eating disorders".