the short answer
Scope of practice for online coaches is the boundary between coaching (programming training, general nutrition habits, and accountability for an apparently healthy client) and clinical care (diagnosing, treating, prescribing, medical nutrition therapy, and rehab). Staying in scope means screening at intake, recognizing the red flags that need a professional, building a referral network before you need it, and documenting the hand-off. It keeps your client safe and keeps you protected.
A note before we start: this article is general information for coaches, not legal or medical advice. Your real scope is set by your certification and by the law where you and your client live, and both vary by country and state. Treat everything here as a starting point, not a ruling - when in doubt, confirm with your certifying body, your insurer, or a qualified professional.