It's really important to remember that while none of the laws of science change, both "calories in" and "calories out" are about two part physics and eight parts biochemistry.

The same food intake will translate to a wide range of energy input for two different people, and the same activity by two people of the same weight will translate into a wide range of calorie output.

I'm only a year and a half into menopause and haven't yet experienced any of that kind of change (although in the same period of time I've tripled my running mileage and doubled my cycling mileage), but I'm sure not going to dismiss the thousands of women who have experienced it.