potential spoilers ahead: I believe if you eat some specific foods before the cooking contest it may give you an edge. Beef à la Mode or Swedish Waffles they both give a cooking buff. On that same train of thought eating foods that give a fishing buff may be beneficial for the fishing contest, which would be: Clam Chowder, Seafood Feast, Sushi Party
potential spoilers ahead:
I believe if you eat some specific foods before the cooking contest it may give you an edge.
Beef à la Mode or Swedish Waffles they both give a cooking buff.
On that same train of thought eating foods that give a fishing buff may be beneficial for the fishing contest,
which would be: Clam Chowder, Seafood Feast, Sushi Party