I don't think there is, so it's obviously an approximation. If I have a dish I plan to eat fairly regularly, I usually take the time to create a custom food for it. If it's a once in a blue moon type of thing, I'll often just go with FitDay's version and not worry about the potential inaccuracy.
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.