Many have blamed the current obesity epidemic on the food and beverage industries, with the increased consumption of high-calorie foods and sugary drinks being the primary cause of our society's ever-increasing waistline. Although it is true that having a healthy and nutritious diet is important for weight control and a healthy life, researchers found it's in fact the lack of exercise that is the primary contributor of being overweight.
The study, conducted by researchers from Stanford University and published in the American Journal of Medicine in July 2014 analysed US National Health and Nutrition Examination Survey between 1988 to 2010 and found that the average BMI increased by 0.37% per year in both men and women and the average waist circumference increased by 0.37% per year in women and 0.27% per year in men in the past two decades. The prevalence of obesity and abdominal obesity has increased substantially, especially in young women aged between 18-39.
Interestingly, in contrary to popular notion, the calorie intake remained steady in the past 2 decades; the daily carb, fat and protein consumptions had not altered significantly either. What changed was the significant decrease in the amount of leisure time physical activities in the general population. The percentage of people reported no physical activity had jumped from 19.1% to 51.7% for women and 11.4% to 43.5% for men between 1994 and 2010.
The study also identified the prevalence of abdominal obesity in normal-weight women. Indicating women are more prone to gain weight around their waist than men on a population level, at least in America. Abdominal obesity can increase the risk of mortality even in young people with normal BMI. It is defined by waist circumference of 88cm and more in women and 102cm and more in men. This increase in waistline is primarily caused by a lack of physical activity.
No one is denying that a healthy, balanced diet is essential for body weight control. However, the increased prevalence in obesity is not correlated with increased calorie intake, as we were made to believe. The ever-increasing waistline of the population is in fact associated with the ever-decreasing amount of physical activities we do. Your health is in your own hands. Be sure try to eat well, but more importantly, stay active. There are no shortcuts to good health, and nothing replaces good ol' physical activity.