Do hotels and restaurants need nutritionists?

Hello, I am working in a hotel now. As far as I know, hotels and restaurants don't need nutritionists. Nowadays, many people take dietitians, but it is generally useless at first. What is needed is experience, because the senior nutritionist certificate must have 3 to 5 years or more work experience. At present, this profession has not started in China, but it may not be possible in the future. Please cheer up if you like.