I also steer clients toward myfitnesspal. It’s a good, general tracking system that lets you check in on them and give them tips and ideas on how to improve. They can customize the daily calorie goal, etc. to their specific situation. It has a huge database and analyzes not only the macro nutrients, but also vitamins/minerals. They can check on their progress throughout the day, which helps them stay on track.
However, they need to be very careful when logging, as many of the entries are user submitted and are not complete or accurate. The best way is to use the scanner tool that automatically inputs the product’s nutrition info.
It’s certainly no replacement for a full blown nutritionist/RD consultation, but provides decent guidelines and is free.