found some food which increases magicfind:
it's not pure magic find so I guess lv.80 food with only magic find on it might boost the stat even more than 20%.Chocolate Omnomberry Cream[s]
Required Level: 80
Dessert: Double-click to to gain a 20% magic find while under the effect of a boon and +10% Boon duration. Lasts 30 minutes.
low level magic find boost:
Strawberries and Biscuts
Required Level: 15
Dessert: Double-click to gain 5% Magic Find. Lasts 30 minutes.
It's an indication that the magic find boosters aren't gemstore-only. It's too early to state that gemstore magic find boosters (+50%) are superior to those gained from food since we have only seen a very small and low level look from the database / BWE gameplay.