Do you believe there's a particular weight that is your own body's comfortable 'set point'?

Like the weight that your particular body settles at?

The reason I ask is because after DD1 was born, I lost a bit of weight and then it just sort of hovered around that point (over the So-Called "healthy" weight range) for 10 years regardless of my diet & exercise in any given week/month/year. It's like that's the weight my body was happy at.

Does any one else have any Set Point ideas and in particular whether you can 're-set' this weight - either up or down?