The Food Preferences is a great feature, but this only flags the item for you in meal planning as a notification. The system doesn't automatically exchange the food for another or filter according to likes or dislikes.  When you have items flagged in your clients plans, you can easily use the Food Swap feature to exchange the item for another, or if you have the Professional Edition, you have full editing capabilities to customize the meal. Food preferences allows you to easily create the plan your clients need. 

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