“Fat-burning” workouts: founded in fact or fiction?

At some point you’ve probably heard the term “fat-burning,” and if you’ve ever set foot on a piece of cardio equipment it probably had a “fat-burning” mode. The implication is that there is something especially important about burning fat in maximizing weight loss.

Weight loss however, is a function of creating a calorie deficit (taking in fewer calories than you burn), and not the substrate (carbohydrate, protein, or fat) that your body is fueling on. In fact your body is always burning both carbohydrate and fat. As the intensity of the activity that you are engaged in increases the percentage of fat you are burning decreases, while conversely, the percentage of carbohydrate (and total calories) you burn increases.

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Information you can trust? Or, your daily dose of misinformation?

You probably already know that you can't trust what you read about weight loss, or dieting, and that has never been more true than it is today with the internet where anybody can write anything (and they do, every day)!

Combating the misinformation in this area could be a fulltime job! Here are two examples from this morning:

Misleading Article #1 - The best fat-burning breakfasts

This article misleads in two ways:

a. Does "eating breakfast really crank up your metabolism?" Any time you eat, the process of digesting what you ate, creates what is called the "thermic effect of food." The thermic effect of food amounts to an average of 10% of ingested calories on a balanced diet, or about 13% of ingested calories on a high-protein diet. There is however, no increase in your underlying metabolic rate, as the "eat breakfast and boost your metabolism" notion promotes. Eating breakfast has long been associated with lower BMIs (body mass index, a weight to height measure) however, researchers suspect that that's because people who eat breakfast have a generally more healthy lifestyle than non breakfast eaters. For instance, "night eaters" tend to eat one (huge) meal a day, and they don't eat breakfast.

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