The line nobody told you about
A personal trainer who tells a client with type 2 diabetes 'cut carbs to 20g a day' just practiced medicine without a license. This single conversation is the most-litigated boundary in our industry. Get it wrong and you lose your insurance, your business, and possibly your house.
What you CAN do as a CPT
The American College of Sports Medicine, NASM, ACE, and most state laws agree a CPT can:
- Promote general nutrition principles based on government guidelines (e.g., MyPlate, Dietary Guidelines for Americans)
- Discuss general principles of healthy eating: lean proteins, vegetables, hydration
- Share publicly available macronutrient information ('protein has 4 kcal/gram')
- Encourage clients to read food labels
- Help clients track their food intake using apps (without prescribing specific amounts)
- Recommend general supplement categories (e.g., 'a multivitamin might help' — never specific brands or doses for medical conditions)
What you CANNOT do
Unless you're also a Registered Dietitian (RD), Licensed Dietitian (LD), or certified nutrition specialist:
- Prescribe specific calorie or macro targets for a client with a medical condition
- Diagnose nutritional deficiencies
- Treat eating disorders
- Prescribe diets for diabetes, kidney disease, heart disease, cancer, IBS/IBD, celiac, food allergies
- Recommend specific supplement doses to address symptoms
- Sell supplements with health claims
- Tell a client to stop a medication
When to refer out
Refer to a Registered Dietitian (RD) when:
- Client has any diagnosed medical condition that affects diet (diabetes, hypertension, kidney disease, GI disorders)
- Client is pregnant, breastfeeding, or trying to conceive (refer to RD with prenatal expertise)
- Client has signs of disordered eating
- Client wants a 'precise' macro plan you're not legally qualified to give
- Client is taking medications with food interactions
Safe language
Don't say: 'You should eat 150g of protein and 200g of carbs.' Do say: 'Research shows people building muscle tend to eat around 0.7–1g protein per pound. Want to track what you're currently eating with MyFitnessPal and we'll see where you're at?' Don't say: 'Cut your carbs to manage your diabetes.' Do say: 'Diet management for diabetes is something your dietitian or doctor needs to lead. I can support whatever protocol they set you up with.' Don't say: 'You need creatine, 5g a day.' Do say: 'Creatine monohydrate is the most-researched performance supplement. Worth chatting with your doctor about it.'The malpractice math
The average trainer makes $44k/year. A single nutrition-related lawsuit averages settlements between $50k–$500k. Insurance carries you for most negligent advice but explicit scope violations void your coverage. The math is brutal: one bad conversation = the rest of your career.
Know the line. Walk it carefully. Refer often.