In one sentence
For a member who has chosen a ketogenic diet and wants it instrumented rather than guessed: carbohydrate against a cap, ketones in the nutritional range, and the lipid panel that tells you how your body is taking it.
Who it is for
Members running, or about to start, a ketogenic diet. VT does not rank diets; this Playbook supports the one you chose and describes what your measures do under it.
Its focus on Home
Nine cards: Ketones, Fasting glucose, Glucose–ketone index, Carbs, Fat, Protein, Hydration, Weight trend and Body fat. The glucose–ketone index needs a CGM and your ketone readings. Also tracked keeps Training Load, steps, calories goal, respiratory rate, resting heart rate, HRV, blood pressure, metabolic age and food noise one swipe away.
What it gives its best with
Asked for: your meals every day, six days in seven, because the cap can only be counted against logged meals; ketone readings, three days a week for the first four weeks and then one, because blood BHB is the only direct measure and breath readings are estimates; and a lipid panel before you start and another 8 to 12 weeks in, because the lipid response is personal and worth knowing early, marked Coming soon for now. Helps: a smart scale, which shows what the diet does to your composition, and a wearable, whose sleep and heart rate show the adaptation.
In Meals
A cap of 30 g of available carbohydrate a day, counted by VT from what you log; the "net carbs" on a packet are not used. Fat at least 60% of energy. Five servings of vegetables a day. Sodium up to 3,000 mg in the first four weeks, then 2,300 mg. And Meals stops measuring you against the fruit and whole-grain guidelines, which a ketogenic diet leaves out on purpose.
Bands
Blood ketones 0.5 to 3.0 mmol/L, the range Volek and Phinney call nutritional ketosis, and carbohydrate up to 30 g, your cap.
What Eir leads with
Ketones, carbohydrate against the cap, protein, fasting glucose and the lipid panel: the first weeks' adaptation, fluids and sodium, and the "keto flu" described as what it is; satiety and food noise as your own evidence; lipid changes described with their size against your previous panel, with a pointer to a professional, once, when LDL cholesterol or ApoB rises. It makes no claim that keto beats other diets, no therapeutic claim for any condition, and does not treat eating below the cap as a virtue.
Sources
- Volek JS, Phinney SD. The Art and Science of Low Carbohydrate Living. Beyond Obesity; 2011
- Vitality Tracker, the Playbook catalogue (Keto Diet, version 2, published November 2026)
- the Features page (Playbook Selection).