My understanding was that they're not eating less. They may just be eating healthy foods, and not changing current eating habits. We need fewer calories as we age, we lose bone mass and it's a lot harder to shift weight. I think that's one of the reasons it's so important to instill healthy habits re: food and exercise in kids early on. I know a lot of women who weren't active at all growing up, but were able to keep a relatively slim figure, until they hit their 30s. Now it's a big struggle for them to keep their weight down.
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