Why yes, I work with a nutritionist every day (me). I'm a Registered Dietitian with a MS in Nutrition.
I work with one of the Kenda road pros now, as well as a few amateur racers, and a swimmer. I Hopefully I can get to where I can do it full-time, that would be my dream job.
Find an RD who is an athlete, or works with them closely. They can help you reach your goals, and a good one will educate you instead of offering to cook your meals.