Study Careers. What Nutritionists Do Nutrition Courses Becoming a Nutritionist order to register you need to be able to demonstrate that you meet the underpinning knowledge and professional skills required. Usually this would require you to have obtained at least a BSc Hons in Nutrition or related bioscience degree, or to demonstrate .Home Nutritionist Nutritionist Certification What It Takes to Be Certified. you can take as few as three online courses to earn a nutrition certificate in as little as a year. A high school diploma or equivalent qualifies you for enrollment. State Requirements for Practicing Nutrition..Yup! To become a certified nutritionist, you need to complete coursework with the CNCB. This is the Clinical Nutrition Certification Board. You will need to submit both a credential review application and your college transcripts to be certified. Read on for another quiz question..