Dr. Jana Klauer's high-profile, hard-charging Manhattan patients can't afford to be off their game. Maybe it's the after-lunch slump, or the inability to focus on a crucial task at deadline time. It could be a constant nagging tiredness, or a thickening waistline, even when they're exercising. Klauer's patients go to Park Avenue's premier nutritionist for results: to look and feel better. And they get them.In The Park Avenue Nutritionist's Plan, Dr. Klauer prescribes a smart eating program to bring you back to peak vitality, sharpness and your perfect weight. Dr. Klauer's Energy Diet will tell you:--How to break the bad habit of constant dieting, and stop cycling through one fashionable diet to the next, without permanent results--When to drink water, and how much--How to use high-protein snacks--When to have your first and last meals of the day--About high-impact foods like berries, leafy green vegetable, fish and dairy calcium--Why some energy shakes restore alertness but others sap