The way to generate more lift is by increasing the wing's angle of attack on the wing (i.e. point the nose up). In addition to increased lift this also increases drag.
Actual numbers are hard to find, but considering the weight of a commercial aircraft can vary by as much as 50% between empty weight and maximum weight, I'd wager it is well over 1%.
More weight = need more lift.
The way to generate more lift is by increasing the wing's angle of attack on the wing (i.e. point the nose up). In addition to increased lift this also increases drag.
Actual numbers are hard to find, but considering the weight of a commercial aircraft can vary by as much as 50% between empty weight and maximum weight, I'd wager it is well over 1%.