You can prepare for a career as a technologist by taking many science courses in high school. Be sure to study biology, microbiology, chemistry, biochemistry and physics. To get hands-on experience working with food, take family and consumer science classes. It's also important to take four years of math classes, English classes, computer classes, and other college preparatory courses.
While you don't need professional training in cooking for this position, it's important to get a degree in food science or culinology, a combination of food science and culinary arts. Buy a copy of the Jacques Pépin book, La Technique, or Mastering the Art of French Cooking by Julia Childs to learn solid foundations and save yourself a tuition in a cooking school.