Dietitian
a person who creates games is called a game designer
A person who creates something totally new is considered an inventor. He or she creates something that has never existed.
Programmer
Imagery
A person who creates new words is called...a neologista wordsmith(For references see Sources and Related links below)
There are different types of routine hospital diets depending on why a person is hospitalized. There are low sodium diets, regular diets, soft diets and liquid diets.
The person who makes up and writes the commercial is called The Copywriter. Then a director is assigned to the shoot
A person who diets.
One website that offers some specialty diets and compares them is medicine.net. Diets vary from person to person depending on how you pair them with exercise, what your weight loss goal is, and such.
A blacksmith is a person who creates objects (such as swords) from steel or iron by forging the metal.
Such a person is an inventor.