Can we choose and become experts in two different careers, for example, data scientist along with nutritionist?

Nutrition is a domain, but Data Science is a skill. Data Science may be used in any sector where there is data to help you make better decisions.
If you want to be a Data Scientist and Nutritionist, you may use statistical techniques to analyze dietary data to find new trends and forecast future occurrences of lifestyle illnesses, eating disorders, and other health problems.
There are a lot of universities that offer this combination, and it’s a highly popular one.