AeroPod, PowerPod and Newton

The weight of the rider and of the bike are necessary when the calibration is done.
What if the weight changes (backpack/no-backpack, 1 vs 3 bottles, loss/gain of body weight)? Is it necessary to update the profile accordingly? Is it necessary to recalibrate?

If you do a lot of hill riding, in your profile you should update your weight if it changes by more than 5 pounds.

If you ride mostly on the flats, it won't be as important to adjust your weight.