I’m looking for a nutrition download/dvd that I can have my clients download when they join my classes

You can always link them to FitDay.com

Your class can track calorie consumption, calorie burning, weight loss goals, and various aspects of their physical fitness. By entering all food and beverage consumption into the site, users maintain a food diary that tracks variables such as calorie, fat, carbohydrate, mineral, and vitamin intake.

The site also contains an extensive nutritional values database, and also provides for the tracking physical activity.