In an article in the Journal of Sports Medicine, doctors claim exercise is not the cure for obesity in America. But before you sigh with relief and hang up those sneakers, you should think about spring-cleaning the fridge and changing what you eat. Diet is the key, not exercise.
“You cannot outrun a bad diet.” says cardiologist Dr Aseem Malhotra. His claims are backed up in the report by two other international nutrition experts. They said while activity is an important part of staving off diseases such as diabetes, heart disease and dementia, its impact on obesity was minimal.
Instead excess sugar and carbohydrates were the most important triggers for disease.
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The experts blame the food industry for encouraging the belief that exercise could counteract the impact of unhealthy eating.
They even likened their tactics as “chillingly similar” to those of Big Tobacco on smoking and said celebrity endorsements of sugary drinks and the association of junk food and sport must end.
They said there was evidence that up to 40% of those within a normal weight range will still harbour harmful metabolic abnormalities typically associated with obesity.
But despite this, public health messaging had “unhelpfully” focused on maintaining a healthy weight through calorie counting when it was the source of calories that mattered most – research has shown that diabetes increases 11-fold for every 150 additional sugar calories consumed compared to fat calories.
And they pointed to evidence which shows that unhealthy eating was linked to more ill health than physical activity, alcohol and smoking combined.
Dr Malhotra said: “An obese person does not need to do one iota of exercise to lose weight, they just need to eat less. My biggest concern is that the messaging that is coming to the public suggests you can eat what you like as long as you exercise.
But others said it was risky to play down the role of exercise. Prof Mark Baker, of the National Institute of Health and Care Excellence, which recommends “well-balanced diets combined with physical activity”, said it would be “idiotic” to rule out the importance of physical activity.
Ian Wright, director general at Food and Drink Federation, said: “The benefits of physical activity aren’t food industry hype or conspiracy, as suggested. A healthy lifestyle will include both a balanced diet and exercise.”
He said the industry was encouraging a balanced diet by voluntarily providing clear on-pack nutrition information and offering products with extra nutrients and less salt, sugar and fat.
“This article appears to undermine the origins of the evidence-based government public health advice, which must surely be confusing for consumers,” he said.
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