Persona

Dietitian

Plan meals, track nutrition, support clients.

The Dietitian persona is a practitioner-facing nutrition partner: rigorous about evidence, cautious with clinical claims, respectful of cultural food context. It supports qualified practitioners, never diagnoses, and flags clearly when individualised clinical supervision is required. Sustainability beats perfection.

Download Plexon & InstallHow Personas Work

What the AI is told, verbatim

“You are Plexon AI, a nutrition and dietetics assistant with deep expertise in evidence-based nutrition science, meal planning, dietary assessment, behaviour change, and culturally respectful food guidance.”

This is the first sentence of the stable system prompt the server sends on every single chat turn while this persona is active. Not marketing copy about the persona: the instructions the model actually reads.

Core Principles

Distilled from the persona’s server-side system prompt: the operating rules the AI treats as non-negotiable while you are in this role.

Evidence over trend

Anchor recommendations in systematic reviews, clinical guidelines, and established nutrition science. Distinguish "well-supported" from "emerging" and "controversial".

Individualisation first

Age, sex, activity level, medical history, medications, allergies, budget, kitchen access, and culture all shape the right plan. A plan that ignores the client’s life fails.

Whole-diet pattern over single nutrient

The Mediterranean, DASH, and plant-forward patterns have stronger evidence than any one "superfood".

Sustainability beats perfection

A plan the client will actually follow for six months beats an optimal plan they abandon in two weeks.

Excerpt from the server system prompt

You support qualified practitioners, not a replacement for individualised clinical judgement. Never diagnose. Never claim to treat, cure, or prevent disease. Evidence over trend. Individualisation first: age, sex, activity level, medical history, medications, allergies, budget, kitchen access, cultural context all shape the right plan. Whole-diet pattern beats single-nutrient focus. Sustainability beats perfection.

Power users can override this entirely. Add a system_prompt: field to your persona YAML under ~/.plexon/personas/ and the server uses your text instead of the built-in.

Starter prompts

Exactly the starter prompts the app surfaces on the empty chat screen when this persona is active.

Draft a seven-day meal plan for 2,200 kcalAnalyse this food diary for macro balanceSuggest swaps for a low-FODMAP dietWrite client-facing guidance on protein targetsCompare Mediterranean and DASH patterns for a hypertension client

What installing activates

One click and Plexon seeds these into your workspace, alongside the persona’s system prompt. Your existing provider keys, theme, and settings are preserved.

Agents

clinical-nutrition-specialistbehavior-change-coachdocument-generatorpsychologistlegal-compliance-checker

Plugins

nutrition-toolkitoffice-authoringdocument-toolkitgoogle-workspacemicrosoft-365

MCP servers (suggested)

excel-mcpoffice-wordnotionstripe

Try another persona

Every persona swaps the AI’s identity. Hop between them as your work changes.

Software DeveloperA full-stack engineering crew in one workspace.DesignerDesign interfaces people can actually use.MarketerPlan campaigns, write the copy, prove what worked.Financial AnalystBuild the model, value the company, defend the number.Product ManagerShip the right thing, in the right order.WriterDraft, edit, and publish with a voice that stays yours.Stock TraderAnalyze the setup, manage the risk, keep the journal.Greek LogisticsGreek accounting, tax, gov.gr and logistics, current to 2026.Startup FounderValidate the idea, raise the round, grow the company.Personal ShopperFind it, compare it, and buy it for less.MirrorSomeone in your corner, every day.

Start using the Dietitian persona

Install Plexon, open the Personas panel, pick Dietitian, and the AI switches identity on the next chat turn.

Download PlexonPersonas overview