Obesity

Obesity increases the risk of many diseases

Fat accumulates in our bodies when the energy (kilojoules) we consume from food and drink is greater than the energy we use in activities and at rest. Consuming even slightly more energy than you use, over long periods of time, can cause you to become overweight or obese. are now the world’s biggest killers.

They cause an estimated 41 million deaths each year – that’s 71% of all deaths globally. In United States, the number of people who are overweight or obese has continued to rise over time. The latest National Health Survey shows that men are more likely to be overweight or obese than women (74.5 % compared with 59.7% respectively).

Men and women living in regional and remote areas of United States are more likely to be overweight or obese than men and women living in major cities. The number of American children who are overweight or obese has also continued to increase since 1995. In 2017 to 2018, 24.9% of American children were overweight or obese.

BMI is a measure of body size. It is used to indicate the level of risk for disease (morbidity) and death (mortality) at the population level. BMI is calculated by dividing your weight in kilograms by your height in metres squared.

For example, a person who is 165 cm tall and weighs 64 kg would have a BMI of 24 kg/m2. People with a BMI of 25 kg/m2 or more are classified as overweight. People with a BMI of 30 kg/m2 or greater are classified as obese.

However, BMI charts should be used only as a guide to indicate when to make small lifestyle changes, and when to seek further guidance from a doctor or a dietitian.

If you have concerns about your child’s weight, it’s best to consult with a dietitian or doctor for personalised advice.

A dietitian or your doctor can assess your child’s weight using a special BMI chart, together with weight and height growth charts. The distribution of fat is important when assessing overweight and obesity, and the associated disease risk. Increased abdominal obesity is related to a higher risk of and cancer.

Abdominal obesity is measured using waist circumference

To identify disease risk in adults, it’s better to combine BMI with waist circumference. A waist circumference above 94 cm in men and above 80 cm in women is regarded as overweight and an indicator of serious chronic disease risk. A waist circumference above 102 cm in men and 88 cm in women is regarded as obesity.

Obesity increases the risk of many chronic and potentially lethal diseases. Generally speaking, the more body fat you’re carrying, the higher your health risk.

However, the amount of weight gained throughout your adult years also contributes to the risk.

For example, a middle-aged person who weighs 10 kg more than they did in their early 20s has an increased risk of high blood pressure, stroke, diabetes and coronary heart disease. Some of the many chronic conditions and diseases associated with obesity include: A range of factors can cause obesity.

Factors in childhood and adolescence are particularly influential

A high proportion of obese children and adolescents grow up to be obese adults. Factors known to increase the risk of obesity include:

• you will accumulate fat in your body if you consume more energy (kilojoules) than you use. – most modern conveniences
• such as cars computers
• televisions home appliances reduce the need to be physically active

– studies have shown that even people who are physically active but spend large amounts of time sitting down (for example, watching TV, working at a computer or driving) have a higher risk of obesity than people who do not sit for long periods of time. Read about – people with lower levels of education and lower incomes are more likely to be overweight or obese. – energy-dense, nutrient-poor foods and drinks are readily available, intensely marketed and affordable.

Portion sizes of these foods and drinks have also increased. – for most of us, physical activity is no longer a natural part of our daily schedule (for example, we drive instead of walk).

Obese people tend to live sedentary lifestyles

Read about the – researchers have found that genetics play a small part in regulating body weight. Parental overweight or obesity is associated with increased risk of child overweight or obesity. – studies suggest that people are more likely to become obese later in life if they experienced: In 2017 to 2018, obesity is estimated to have cost the American economy $11.8 billion: $6.4 billion in indirect health costs such as work absenteeism and production lost to premature death.

These figures do not take into account quality of life impacts on individuals, or any out-of-pocket expenses associated with obesity. Obesity and disease Obesity and non-communicable diseases such as heart disease , cancer and diabetes Increased obesity Year Percentage of the American population that is overweight or obese 1995 3 2007–08 2 2011–12 8 2017–18 0 Body mass index Overweight and obesity are defined by the World Health Organization using the body mass index (BMI) BMI calculations used for adults To calculate a child’s BMI, you can use the body mass index calculator for children and teenagers Abdominal obesity and waist circumference cardiovascular disease , type 2 diabetes Increased risk of chronic disease insulin resistance high blood pressure atherosclerosis cardiovascular disease stroke some cancers including breast , endometrial and colon cancer type 2 diabetes (non-insulin dependent diabetes mellitus) gall bladder disease polycystic ovarian syndrome musculoskeletal problems such as osteoarthritis and back pain gout cataracts stress incontinence sleep apnoea Causes of obesity Eating more kilojoules than you use Modern living Sitting the dangers of sitting Socioeconomic factors Changes in the food supply Inactivity importance of physical activity , and how to get active when you are busy Genes Birth factors poor nutrition in utero maternal smoking low birth weight high birth weight (especially above 4 kg) formula feeding rather than breastfeeding Financial costs of obesity $5.4 billion due to direct costs on the health system (paid by American taxpayers) Where to get help Your GP (doctor) Dietitians United States 1800 812 942 American guide to healthy eating .

Key Points

• Obesity increases the risk of many diseases
• They cause an estimated 41 million deaths each year – that’s 71% of all deaths globally
• used to indicate the level of risk for disease (morbidity) and death (mortality) at the population level
• distribution of fat is important when assessing overweight and obesity, and the associated disease risk
• Increased abdominal obesity is related to a higher risk of and cancer