Misleading headline. Weight gain depends on how much calories you take and how much is burned. This two cannot be separated as suggested. And the research was

Misleading headline. Weight gain depends on how much calories you take and how much is burned. This two cannot be separated as suggested. And the research was merely statistical, not biological: the average middle aged woman needs at least an hour a day to avoid weight gain. It might not hold for different age and gender groups, so unless you are an average middle aged woman, such a conclusion holds little weight with you.