Lose It is far from perfect. The food database is pretty bad; I find it to be very incomplete. Instead of using the database, I get nutritional information from food packaging or on the Internet (often using the iPhone's built-in browser) and enter calories manually; Lose It makes that easy to do, and once you've entered a food item once, Lose It makes it easy to re-use it for a later meal.
Likewise, the weight-history data in Lose It is weak; you can't look up what you weighed last week or last month. On the other hand, Lose It does provide you with a nice-looking line chart to show your progress losing or gaining weight over time. I use Weightbot as well as an Excel spreadsheet on my desktop to track more detailed information.
The best tool isn't the perfect tool, it's the tool you actually use.
Despite Lose It's problems, it's the most useful health and fitness app that I've found and it may be the most useful iPhone app, period. With Lose It's help, I've lost 28 pounds since March. 63 more pounds to go!
Documents To Go DataViz Inc. Cost: $9.99
Documents To Go isn't a healthcare app, it's a general-purpose productivity program. But exercise programs, diets, and other healthcare routines require record-keeping, and that's where DocsToGo comes in. The software lets you edit, create, and view Microsoft Word and Excel spreadsheets on your iPhone, and synch them to your desktop.
Use those documents to track your weight, exercise programs, keep a food journal, and more. Professional race car driver Charlie Kimball controls
his diabetes by keeping records in an Excel spreadsheet template designed by his doctors, which he synchs to his desktop using Docs to Go and e-mails to his doctor.
Simplenote Codality Inc. Cost: $1.99
Another general-purpose app that can be applied to healthcare record-keeping, Simplenote is similar to the iPhone's built-in Notes app. The major difference: Simplenote synchs to a Web application, while the Notes app requires Apple Mail on the Mac, or Outlook on Windows. Simplenote also has a different font and background color than Notes.