Participating in culturally elite activities related to lower BMI?

A new sociological study suggests there is a relationship between participating in certain cultural activities and having a lower BMI:

The study uses survey data from 17 nations, most of which are in Europe. In each country, a representative sample of the population was asked not only about height and weight, but also about time spent in a variety of activities. These included reading, going to cultural events, socializing with family and friends, attending sporting events, watching TV, going shopping, and exercising.A scale that measures interest in ideas, art, and knowledge—by surveying the amount of time spent reading, attending cultural events, going to movies, and using the Internet—is associated as strongly as exercise with a lower body-mass index, or BMI (a measure of weight relative to height). In other words, reading and exercise appear similarly beneficial in terms of BMI.

In contrast, people participating in other activities such as watching TV, socializing, playing cards, attending sporting events, and shopping have higher average BMI. Although time spent reading and time spent watching TV both expend few calories, one is associated with lower weight, and the other with higher weight…

So why might reading and related cultural activities be associated with thinness? The social meaning of the activity rather than the activity itself must be important for weight control. Leisure-time activities involve more than the calories burned; they also reflect differences across social groups in motives and means for good health.

These sound like interesting findings but I wonder if this is a classic example of “correlation does not imply causation.” Since these cultural activities might be related to social class, how do these findings line up with current statistics about weight (and health) by social class?

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