Can't these 5% still compounds over time if you were at the equilibrium before? I have no idea how much it represents in weight gain over a day, but just 10 g/d

Can't these 5% still compounds over time if you were at the equilibrium before? I have no idea how much it represents in weight gain over a day, but just 10 g/d is still close to 5 kg weight gain over a year. Though I agree with you, it's more the overall activity that is way down than just gym/exercising.