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A new study is challenging the idea that sitting itself is the problem for your brain. A study covered by HealthDay found that heavy TV watching was associated with shrinkage in areas of the brain connected to memory and thinking, with most of the observed brain changes concentrated in men. But other forms of sedentary behavior were not linked to smaller brain volume. In fact, people who spent the day seated in mentally demanding jobs showed larger frontal and occipital volumes and less white matter damage than heavy TV viewers. Because the study relied on self-reported viewing habits and did not include baseline brain scans, it shows correlation rather than proof that television causes brain shrinkage. Here’s what people are reacting to: the distinction that may matter most is not sitting versus moving, but passive viewing versus mentally engaged downtime.