'Out of context quoting doesn't help. Never'
International handbook of Internet posting.  :D

Sorry, just pointing out that I don't know to what you are referring to. I was answering to your sentence 'Wings that are not level will lose lift.' As quoted  :) By the way, your quote comes from these paragraphs, right?

Quote:

Additionally, because more lift is required during a turn than when in straight-and-level flight, the angle of attack (AOA) must be increased by applying elevator back pressure. The steeper the turn, the more elevator back pressure is needed. As the desired angle of bank is established, aileron and rudder pressures should be relaxed. This stops the angle of bank from increasing, because the aileron and rudder control surfaces are  in a neutral and streamlined position. Elevator back pressure should be held constant to maintain altitude.

Highlighting by me. So, banked wings still don't lose lift, even when using 'your' book.

A good book that is of course, it explains the forces in turns in chapter 4-19. Great read and a free download! http://www.faa.gov/library/manuals/aviation/pilot_handbook/