It is a hazy area. The facts as I understand them are that if a personal trainer creates a meal plan for a client it is outside of their scope of practice. It may never become a legal issue, but if it comes to light the personal trainer could be in for a very rough time. The client could claim that they had an adverse reaction to the food. Or could actually have an adverse reaction. The trainer would not be covered by their insurance, so all of their personal assets and future income would be at risk. They could be barred from working as a personal trainer in their state or nationally. Their working outside of their scope would most likely result in their certifying organization stripping their certification. Now as to other legal actions such as being charged with a criminal offense or taken to civil court, I don’t really know. If I can’t make a living staying in my scope of practice, I would find another way to make a living.