I like doctors to be licensed. I'm normally anti-regulation, but this is an exception.
The real issue here is the onerous occupational licensing requirements in Florida. To be a nutritionist in Florida, you need a degree and 900 hours of work. That's far too much.
Occupational licensing has become a way for an industry to form a cartel. It's a major public policy problem, and the IJ is right to take it on. They've fought against it in a great many cases and had some success.
Unfortunately, though, the First Amendment is a blunt tool and doesn't work very well in this particular case. I wish they had a better tool.