In one sentence
Glucose stability first: keep glucose steady across every meal and night, and catch metabolic drift early, before it shows up in a lab result.
Who it is for
Members who want to read their glucose the way a researcher would: a Baseline Month on a sensor as the reference, their own response to their own meals, fasting glucose and HbA1c as the slow markers, and visceral fat and waist as the slow drivers. You can start without a sensor or lab results; until they arrive it runs on partial information, the cards that need them stay open, and Eir can only read what is there. Longevity Playbook covers the same ground with what you have.
Its focus on Home
Nine cards: Glucose, Fasting glucose, HbA1c (the CGM's estimate), Glucose variability, Time in tight range, Adiposity (body fat, visceral fat and waist in one card), Metabolic age, Blood pressure and Resting heart rate. Also tracked keeps Training Load, steps, calories goal, respiratory rate, HRV, vascular age, fasting window, ketones and alcohol this week one swipe away.
What it gives its best with
Asked for: three CGM periods a year, a Baseline Month first and then a fortnight every four months; your meals every day, six days in seven, because a glucose curve without the meal beside it explains nothing; a smart scale, for visceral fat and body fat; a wearable, because sleep is read beside the next day's glucose; and initial lab results, the slow reference the sensor is read against, marked Coming soon for now. After the third unanswered reminder about the CGM periods, VT offers Longevity once.
Bands
Fasting glucose against the American Diabetes Association's normal range, under 5.6 mmol/L (100 mg/dL), and HbA1c under 5.7%, labeled Normal on the card. The CGM measures keep the references in their own entries.
In Meals
Five servings of vegetables and two of fruit a day, and sodium up to 2,000 mg. There is no carbohydrate cap: VT does not pick between diets, and your sensor decides. Glycemic load is shown as a reference, with your sensor as the arbiter.
What Eir leads with
Fasting glucose, HbA1c, glucose variability, visceral fat and waist: what each meal was made of and your own glucose response to it, movement after meals, sleep's effect on the next day's glucose, and the Baseline Month as the reference. It gives no energy-restriction advice unless you ask, and it does not rank diets against each other.
Sources
- American Diabetes Association. 2. Diagnosis and classification of diabetes: Standards of Care in Diabetes 2024. Diabetes Care 2024;47(Suppl 1):S20–42. doi:10.2337/dc24-S002
- Vitality Tracker, the Playbook catalogue (Metabolic Health, version 2, published November 2026)
- the Features page (Playbook Selection).