|Obesity has a number of medical complications which negatively impact peoples' quality of life.|
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|Human body weight|
Obesity is a risk factor for many chronic physical and mental illnesses. Because of the social stigma of obesity, people who are obese may receive poorer healthcare than normal weight individuals, potentially contributing to the relationship between obesity and poor health outcomes. People who experience weight-related discrimination, irrespective of their actual weight status, similarly have poorer health outcomes than those who do not experience weight-related discrimination. People who are obese are also less likely to seek medical care than people who are not obese, even if the weight gain is caused by medical problems. Some have proposed that obesity-associated medical conditions may be produced primarily be stress from the social stigma of obesity, rather than from obesity per se.
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 to 29.9) may actually be lower than for those with an "ideal" weight (BMI 18.5 to 24.9).
Health risks for those who are overweight may be decreasing over time as a result of improvements in medical care.
Body weight is not considered to be an independently predictive risk factor for cardiovascular disease by current (as of 2014) risk assessment tools.
Mortality from cardiovascular disease has decreased despite increases in obesity, and at least one clinical trial was stopped early because the weight loss intervention being tested did not reduce cardiovascular disease.
Ischemic heart disease
Abdominal obesity is associated with cardiovascular diseases including angina and myocardial infarction. However, overall obesity (as measured by BMI) may lead to false diagnoses of myocardial infarction and may decrease mortality after acute myocardial infarction.
In 2008, European guidelines concluded that 35% of ischemic heart disease among adults in Europe is due to obesity.
Congestive heart failure
High blood pressure
More than 85% of those with hypertension have a BMI greater than 25, although diet is probably a more important factor than body weight. The risk of hypertension is 5 times higher in the obese as compared to those of normal weight. The association between obesity and hypertension has been found in animal and clinical studies, which have suggested that there are multiple potential mechanisms for obesity-induced hypertension. These mechanisms include the activation of the sympathetic nervous system as well as the activation of the renin–angiotensin–aldosterone system. As of 2007, it was unclear whether there is an association between hypertension and obesity in children, but there is little direct evidence that blood pressure has increased despite increases in pediatric overweight.
Abnormal cholesterol levels
Deep vein thrombosis and pulmonary embolism
The link between obesity and type 2 diabetes is so strong that researchers in the 1970s started calling it "diabesity". Excess weight is behind 64% of cases of diabetes in men and 77% of cases in women.
In some individuals, obesity can be associated with elevated peripheral conversion of androgens into estrogens.
Gastroesophageal reflux disease
Several studies have shown that the frequency and severity of GERD symptoms increase with BMI, such that people who are underweight have the fewest GERD symptoms, and people who are severely obese have the most GERD symptoms. However, most studies find that GERD symptoms are not improved by nonsurgical weight loss.
Reproductive system (or genital system)
Polycystic ovarian syndrome (PCOS)
Due to its association with insulin resistance, the risk of obesity increases with polycystic ovarian syndrome (PCOS). In the US approximately 60% of patients with PCOS have a BMI greater than 30. It remains uncertain whether PCOS contributes to obesity, or the reverse.
Obesity can lead to infertility in both men and women. This is primarily due to excess estrogen interfering with normal ovulation in women and altering spermatogenesis in men. It is believed to cause 6% of primary infertility. A review in 2013 came to the result that obesity increases the risk of oligospermia and azoospermia in men, with an of odds ratio 1.3. Being morbidly obese increases the odds ratio to 2.0.
Complications of pregnancy
Obesity is related to many complications in pregnancy including: haemorrhage, infection, increased hospital stays for the mother, and increased NICU requirements for the infant. Obese women also have increased risk of preterm births and low birth weight infants.
Those who are obese during pregnancy have a greater risk of have a child with a number of congenital malformations including: neural tube defects such as anencephaly and spina bifida, cardiovascular anomalies, including septal anomalies, cleft lip and palate, anorectal malformation, limb reduction anomalies, and hydrocephaly.
Intrauterine fetal death
Maternal obesity is associated with an increased risk of intrauterine fetal death.
Carpal tunnel syndrome
Idiopathic intracranial hypertension
Idiopathic intracranial hypertension, or unexplained high pressure in the cranium, is a rare condition that can cause visual impairment, frequent severe headache, and tinnitus. It is most commonly seen in obese women, and the incidence of idiopathic intracranial hypertension is increasing along with increases in the number of people who are obese.
Women that are obese at age 18 have a greater than twofold increased risk of multiple sclerosis compared to women with a BMI between 18.5 and 20.9. Women who were underweight at age 18 had the lowest risk of multiple sclerosis. However, body weight as an adult was not associated with risk of multiple sclerosis.
Cancer (or oncological)
Many cancers occur at increased frequency in those who are overweight or obese. A study from the United Kingdom found that approximately 5% of cancer is due to excess weight. These cancers include: 
A high body mass index (BMI) is associated with a higher risk of developing ten common cancers including 41% of uterine cancers and at least 10% of gallbladder, kidney, liver and colon cancers in the UK. For those undergoing surgery for cancer, obesity is also associated with an increased risk of major postoperative complications compared with those of normal weight.
Obesity has been associated with depression, likely due to social factors rather than physical effects of obesity. However, it is possible that obesity is caused by depression (due to reduced physical activity or, in some people, increases in appetite). Obesity-related disabilities may also lead to depression in some people. Repeated failed attempts at weight loss might also lead to depression.
The association between obesity and depression is strongest in those who are more severely obese, those who are younger, and in women. Suicide rate however decreases with increased BMI. Similarly, weight loss through bariatric surgery is associated with increased risk of suicide.
Obese people draw negative reactions from others, and people are less willing to help obese individuals in any situation. People who are obese also experience fewer educational and career opportunities, on average earn a lesser income, and generally receive poorer health care and treatment than individuals who are normal weight.
Obstructive sleep apnea
Obesity hypoventilation syndrome
Chronic lung disease
Obesity is associated with a number of chronic lung diseases, including asthma and COPD. It is believed that a systemic pro-inflammatory state induced by some causes of obesity may contribute to airway inflammation, leading to asthma.
Complications during general anaesthesia
Obesity and asthma
The low grade systemic inflammation of obesity has been show to worsen lung function in asthma and increase the risk of developing an asthma exacerbation.
A study in England found a linear increase in severe COVID-19 resulting in hospitalisation and death for those whose BMI is above 23, and a linear increase in admission to an intensive care unit across the whole BMI spectrum. The difference in COVID-19 risk from having a high BMI was most pronounced in people aged under 40, or who were black. A study from Mexico found that obesity alone was responsible for a 2.7 times increased risk of death from COVID-19, while comorbidities with diabetes, immunosuppression or high blood pressure increased the risk further. A study from the United States found that there was an inverse correlation between age and BMI of COVID patients; the younger the age group, the higher its BMI.
Rheumatological and orthopedic
There is a strong association between obesity and musculoskeletal pain and disability.
Low back pain
Obese individuals are twice to four times more likely to have lower back pain than their normal weight peers.
Urological and nephrological
Urge, stress, and mixed incontinence all occur at higher rates in the obese. The rates of urinary incontinence are about double that found in the normal weight population. Urinary incontinence improves with weight lost.
Chronic kidney disease
In men, obesity and metabolic syndrome both increase estrogen and adipokine production. This reduces gonadotropin-releasing hormone, in turn reducing both luteinizing hormone and follicle stimulating hormone. The result is reduction of the testis' production of testosterone and a further increase in adipokine levels. This then feeds back to cause further weight gain.
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