It's Your Health
This article was produced in collaboration with the Public Health Agency of Canada.
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The number of Canadians who are overweight or obese has increased dramatically over the past 25 years. Obesity is a risk factor in a number of chronic diseases. Achieving and maintaining a healthy weight is important to reduce the risk of those diseases and improve overall health.
Although smoking remains the greatest threat to public health in Canada, poor eating habits, physical inactivity and their contribution to obesity are also critical public health challenges. Statistics Canada reports that two out of every three adults in Canada are overweight or obese.
The proportion of obese children has nearly tripled in the last 25 years. The increases were seen for both boys and girls and across all age groups except pre-schoolers. As well, more than half of Canadian children and youth are not active enough for optimal growth and development.
Many factors have contributed to the increasing rates of overweight and obesity. Changes in society, work and leisure have affected activity and eating patterns, leading to a rise in overweight and obesity. There has been a shift towards less physically demanding work, as well as an increased use of automated transport and passive leisure activities, such as television viewing and playing video games. Many children and youth have fewer opportunities to be physically active at school as physical education classes and time spent being physically active at school have been reduced. There are also fewer children and youth walking to and from school. Statistics Canada found a direct correlation between the amount of time youth spent watching TV and playing video games, and their likelihood of being overweight or obese.
Changes in our food environment, including consuming larger portion sizes and the availability of a wide variety of inexpensive food, have also made it challenging to maintain a healthy weight.
The body mass index (BMI) and waist circumference (WC) measurement are two tools used by health professionals to help assess your risk of developing health problems associated with being overweight and underweight. These tools are used with adults age 18 years and over, with the exception of pregnant and breastfeeding women. The BMI and WC may underestimate or overestimate health risks in certain adults, such as:
The BMI is a ratio of weight-to-height. It is not a direct measure of body fat but it is an indicator of health risk associated with being under- and overweight. Research conducted with large groups of people have shown that the BMI can be classified into ranges associated with health risk. There are four categories of BMI ranges in the Canadian weight classification system. These are:
To calculate your BMI and level of risk, use the link provided in the Need More Info? section or see your doctor.
The WC measurement is an indicator of health risk associated with abdominal obesity. Excess fat around the waist and upper body (also described as an "apple" body shape) is associated with greater health risk than fat located more in the hip and thigh areas (described as a "pear" body shape).
A WC measurement of 102 cm (40 in.) or more for men, and 88 cm (35 in.) or more for women, is associated with an increased risk of developing health problems such as Type 2 diabetes, coronary heart disease and high blood pressure. As the cut-off points are approximate, a WC just below these measurements should also be taken seriously. In general, your risk of developing health problems increases as your WC measurement increases above the cut-off points.
Your age, family history and the presence of other health conditions, such as high cholesterol, high blood pressure or high blood sugar levels can all interact with being overweight or obese to greatly elevate your risk of developing a wide range of chronic diseases. Poor eating habits, physical inactivity, and tobacco use not only contribute to the development of these conditions, they can further exacerbate their burden on your health.
If you are overweight or obese, you may be at risk for a wide range of serious diseases and conditions including:
Obesity is one of the leading factors in heart disease and stroke, as well as in Type 2 diabetes, which affects an estimated 1.8 million Canadians. If you are overweight, you are at high risk of becoming obese, which can more seriously affect your health.
Health Canada and the Public Health Agency of Canada are committed to helping Canadians improve their health and well-being by promoting and supporting regular physical activity and healthy eating.
The Centre for Health Promotion is actively working with other levels of government, the private and voluntary sector on the issue of healthy living, which includes physical activity, healthy eating and healthy weights.
The Office of Nutrition Policy and Promotion supports the nutritional health and well-being of Canadians by defining, promoting and implementing evidence-based nutrition policies and standards.
The Food Directorate is the federal health authority responsible for establishing policies, setting standards and providing advice and information on the safety and nutritional value of food.
The Centre for Chronic Disease Prevention and Control works with stakeholders to provide leadership in chronic disease prevention and control across Canada and internationally.
For more on Eating Well with Canada's Food Guide.
For more on Canada's Physical Activity Guides to Healthy Active Living, go to: Physical Activity.
To calculate your Body Mass Index (BMI) Nomogram.
For more on Nutrition Labelling.
For more on Healthy Living, go to:
For additional articles on health and safety issues go to the It's Your Health Web site. You can also call toll free at 1-866-225-0709 or TTY at 1-800-267-1245*.
Original : October 2006
ę Her Majesty the Queen in Right of Canada, represented by the Minister of Health, 2006