Any good personal trainer would be a nutritional expert, esp. if they are world renowned. I am a personal trainer with type 1 diabetes and I always integrate nutrition into my fitness plans. It's not competition, about who can grow largest in bodybuilding, it's how can I reach my very best body, given my personal limit and parameters of fitness: physical, psychological, mental, and spiritual. That's what I aim for in my business. Most people have a very limited cview of fitness, in my opinion.