I heard this analogy that’s saying “weight is about calories in/calories out” is like saying “you win a basketball game by scoring more points”. It’s true, but also mostly uninformative and not that helpful.
In answer to your specific question: accumulation of fat and efficiency of calorie usage change with age and hormones. The specific chemistry/biology of why an individual person is having trouble losing weight is hard to pin down (because if we knew pharma companies would have a way easier time selling them weight loss drugs)
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