Gamp's Law of Elemental Transfiguration is a law governing the magical world. There are >> five Principal Exceptions to Gamp's Law, one of which is food.
It should be noted that while food cannot be outright created from nothing, it can be
multiplied if one already has some food to multiply, it can be enlarged or the food can
be summoned if one knows the approximate location and is fairly sure the food will still >> be there.
In September 1997, after Ron commented that his mother could make good food out of thin
air, Hermione stated that this was impossible, as food is one of the five Principle
Exemptions to this law, but this only irritated Ron, who wanted her to "speak English",
but was not satisfied by her explanation.
On 1 May, 1998, after Neville Longbottom noted that the one thing that the Room of
Requirement did not seem to be able to provide was food, Ron commented that food was one
of the five Principle Exceptions to this law, to "general astonishment".
Behind the scenes
Gamp's Law apparently uses the surname of the person who discovered it. Hesper Gamp,
a witch married to Sirius Black II, might be that person or a relative of that person.
According to W.O.M.B.A.T., it may or may not be possible to turn an animal into
Although many things appear impossible to conjure, there is legislation in the
wizarding world about what can and cannot be conjured.
In chapter five, "Weasley's Wizarding Wheezes", of Harry Potter and the Goblet of Fire, Mrs. Weasley creates sauce without an incantation. Quote from American paperback edition: "A creamy sauce poured from the wand tip as she stirred."