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The following is a list of foods that are allowed (legal) and foods that are not allowed (illegal) while following the Paleo diet. 

Fennel Allowed  
Fenugreek Allowed  
Figs Allowed  
Fish roe Allowed  
Fish sauce Allowed  
Flaxseed oil Allowed Buy organic, extra-virgin, and cold-pressed. Use within a month.
Fruit juice (real, fresh) Allowed Must be made fresh from whole fruits. Occasionally.