Methodology

How the Vitality Score Works

A plain-language guide to LivRight's model — what it tracks, how it moves, and what it isn't.

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What the Vitality Score is

The Vitality Score is a 0–100 habit summary built from the meals and actions you log. Meal ratings adjust the score, and the app's time-based model gradually moves it toward its baseline between entries.

Not a medical measurement. It does not read your blood sugar, cholesterol, metabolism, or any other biomarker. It is a visual summary of app data, not a reading from your body.

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The 8 drivers

Every scan evaluates your meal across eight factors that nutrition research consistently identifies as important:

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Added sugar
Sweeteners beyond what's naturally in whole foods

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Carb load
The amount and likely digestion speed of visible carbohydrate sources

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Saturated fat
Solid fats from animal products and tropical oils

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Fiber
Vegetables, whole grains, legumes, fruit

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Protein
Meat, fish, eggs, dairy, legumes, nuts

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Sodium
Salt, especially from processed and restaurant foods

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Cooking method
Deep-frying vs. grilling, steaming, baking

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Alcohol
Beer, wine, spirits, cocktails

Fiber and protein can support a stronger food rating. Elevated risk drivers can lower it. The visible combination determines a rating: Excellent, Moderate, Limit, or Avoid.

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How the score moves

The Vitality Score summarizes your logged day rather than treating every meal as an isolated card:

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Lower-rated meals reduce the score. The rating and its visible drivers determine the adjustment.

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Higher-rated meals can raise it. The score change comes from the logged meal rating, not a physiological reading.

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The model also uses time. Between entries, the app moves the score toward its configured baseline.

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The time-based movement pauses after 24 hours. A new logged meal gives the score fresh context.

The score reflects your last 7 days. One heavy meal won't ruin a good week; one salad won't fix a bad one. The trend is what matters.

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Score ranges

80–100

Thriving — Your recent choices have been strong.

50–79

Balancing — Mixed signals, room to improve.

0–49

Needs Reset — Recent ratings were lower; look for one practical next step.

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Three-day experiment

After you have logged a meal, LivRight can offer an optional experiment: dinner before 8 PM for three evenings. You choose whether to start it, and progress is capped at one match per calendar day.

The experiment records the behavior you complete alongside your meal history. It does not measure a physiological outcome or claim that the timing change caused one.

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Post-meal activity

After a Limit or Avoid meal, LivRight can open a 45-minute walk window with a 1,000-step goal. You can import steps read-only from Apple Health or mark the walk complete manually as self-reported. Health data is not sent to an AI model.

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What the score is not

Not a glucose measurement — it does not read your blood sugar
Not a medical diagnosis — it does not diagnose, treat, cure, or prevent any disease
Not a calorie counter — it evaluates food quality patterns, not energy balance
Not a substitute for professional advice — always consult your doctor

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Sources and approach

The 8 drivers are based on nutritional science from Harvard T.H. Chan School of Public Health, the American Heart Association, Mayo Clinic, and the NIH. The scoring model is an approximation designed to make dietary patterns visible — it is not a peer-reviewed clinical tool.

LivRight is not a medical device. It does not diagnose, treat, cure, or prevent any disease. Nothing in the app or on this page is medical advice. Always consult a qualified healthcare professional about your health decisions.