How the Health Freak Score Works
A transparent, evidence-based nutritional quality score for restaurant food and everyday meals — built on peer-reviewed science, not proprietary black-box algorithms.
What is the Health Freak Score?
The Health Freak Score is a numerical rating from 0 to 10 that tells you, at a glance, how a dish or meal performs across evidence-based nutritional quality markers. Unlike calorie counts alone — which tell you how much energy something contains but nothing about whether it is actually nourishing — our score reflects the full picture: protein quality, fibre, micronutrient breadth, plant diversity, food processing level, and the balance of saturated fat, salt, and sugar.
Higher is better. A score of 7 or above means a dish performs strongly across all major quality dimensions. A score below 3 usually indicates limited nutritional value — high in free sugars, saturated fat, or ultra-processed ingredients with little protein or fibre in return.
The score is not a verdict on you or your food choices. It is information — the same kind a registered dietitian would consider when advising someone on the nutritional quality of their diet.
Why We Built It
UK adults now eat approximately one in four meals outside the home. Mandatory calorie labelling has helped, but calories alone are a deeply insufficient guide to nutritional quality. A 500 kcal salmon bowl and a 500 kcal croissant carry the same calorie label. They are not nutritionally equivalent.
Health Freak exists to close that gap — for restaurants, for diners, and for anyone who wants to understand their food better. Our scoring system is published in full. Every coefficient, every scientific reference, every calibration decision is documented. If you disagree with a weighting, you can tell us why.
What the Score Measures
The Health Freak Score is built from four components:
1. Macronutrient Quality Score (MQS)
Evaluates the balance of beneficial and harmful macronutrients, normalised per 100 kilocalories so portion size doesn't distort the comparison.
Positive factors
- Protein density — rewarded above 3g per 100 kcal (Leidy et al. 2015)
- Dietary fibre — rewarded above 2g per 100 kcal (Reynolds et al. 2019, Lancet)
Penalty factors
- Saturated fat — dose-response for LDL cholesterol (Hooper et al. 2020)
- Free sugars — blended formula (WHO 2015; Te Morenga et al. 2012)
- Salt — UK's leading modifiable CV risk factor (Aburto et al. 2013)
2. Micronutrient Richness Score (MRS)
Measures how broadly a meal covers your daily micronutrient needs across 12 essential nutrients:
Vitamin A · Vitamin C · Vitamin D · Vitamin B12 · Folate · Iron · Calcium · Magnesium · Zinc · Potassium · Selenium · Omega-3
Each nutrient is measured as a fraction of the UK Dietary Reference Value (DRV), capped at 100% so no single nutrient can inflate the score unfairly.
3. Plant Diversity Bonus
A bonus of up to +0.5 points for the number of distinct plant food groups present: wholegrains, legumes, vegetables, fruits, and nuts/seeds. Evidence from the American Gut Project (McDonald et al. 2018) and Wastyk et al. (2021, Cell).
4. Food Processing Penalty
Based on the NOVA classification. Ultra-processed foods carry a 0.8 point deduction — proportionate to the 14% higher all-cause mortality found in the NutriNet-Santé cohort (Srour et al. 2019, BMJ). The only RCT of ultra-processed vs unprocessed diets (Hall et al. 2019) found participants consumed 508 more kcal/day on the ultra-processed diet.
Final blend
Base Score = (MQS × 75%) + (MRS × 25%) + plant bonus − processing penalty
Five Scoring Profiles
Because nutritional goals differ, the Health Freak Score adapts to five evidence-based profiles. The same dish, scored through five different lenses:
General healthy eating
Balanced macronutrients + micronutrient breadth
Active individuals, training goals
Protein density above all else
Gut health, portfolio diet
Fibre density + plant diversity
Fat loss, body composition
High protein + low total energy density
Longevity, healthy ageing
Longevity-weighted micronutrients — omega-3, vitamin D, selenium, B12
The Bio Hacker profile uses a longevity-weighted MRS where nutrients are re-weighted according to the strength of evidence for healthy ageing. Based on the REDUCE-IT trial (Bhatt et al. 2019, NEJM) and the VITAL trial (Manson et al. 2019, NEJM).
Daily Meal Score
When you log multiple foods throughout the day, Health Freak aggregates your nutritional intake and calculates a rolling daily score. This is more meaningful than scoring items in isolation — a banana scores modestly on its own, but as part of a day that includes oily fish, legumes, and leafy greens, it contributes to strong potassium and vitamin C coverage. The formula is designed at meal and day level, not ingredient level.
Development Sample Results
Our scoring formula was calibrated against 318 dishes from four UK restaurant chains:
| Restaurant | Dishes scored | Average base score |
|---|---|---|
| itsu | 78 | 5.37 / 10 |
| Farmer J | 44 | 5.29 / 10 |
| Pret a Manger | 169 | 4.97 / 10 |
| The Salad Project | 27 | 4.94 / 10 |
6% of dishes scored 7.0+, 57% scored 5.0–7.0, 16% scored below 3.0. Highest-scoring dishes were oily fish preparations — salmon sashimi, miso salmon, shawarma chicken.
What the Score Is Not
- It is not a dietary prescription. It doesn't account for your individual health conditions, medications, or life stage.
- It is not a measure of taste, sustainability, ethics, or value for money — only nutritional quality.
- It is not a reason to avoid any food. A croissant that scores 2.5 is a perfectly reasonable occasional choice.
- It is not final. We update our formula as the evidence base grows and as we obtain more verified data.
Frequently Asked Questions
Why does a banana score lower than a chicken dish?
The formula scores complete meals, not individual ingredients. A banana has excellent potassium and vitamin C but limited protein as a standalone item. In the context of a full day's eating it contributes positively. Use the daily score for single whole foods.
Why is the Bio Hacker score generally lower?
It weights omega-3, vitamin D, selenium, and B12 very heavily — nutrients that are genuinely sparse in most restaurant food. Only oily fish dishes score highly. A Bio Hacker score of 6 represents an excellent eat-out choice for longevity nutrition.
Does a high score mean I should eat this every day?
No. Nutritional diversity matters. A varied diet — even with some lower-scoring items — may be more beneficial long-term than identical high-scoring meals.
Can restaurants improve their scores?
Yes — by providing analytically verified nutritional data, by reformulating dishes to reduce salt or ultra-processed ingredients, or by having their existing profile accurately reflected. We work directly with restaurant partners on all of the above.
References
- Leidy HJ et al. (2015). "The role of protein in weight loss and maintenance." Am J Clin Nutr. 101(6):1320S-1329S.
- Reynolds A et al. (2019). "Carbohydrate quality and human health." The Lancet. 393(10170):434-445.
- Hooper L et al. (2020). "Reduction in saturated fat intake for cardiovascular disease." Cochrane Database of Systematic Reviews.
- Srour B et al. (2019). "Ultra-processed food intake and risk of cardiovascular disease." BMJ. 365:l1451.
- Hall KD et al. (2019). "Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain." Cell Metabolism. 30(1):67-77.
- Bhatt DL et al. (2019). "Cardiovascular Risk Reduction with Icosapent Ethyl." NEJM. 380(1):11-22.
- Manson JE et al. (2019). "Vitamin D Supplements and Prevention of Cancer and Cardiovascular Disease." NEJM. 380(1):33-44.
Health Freak scoring methodology v0.3 · Last updated March 2026 · methodology@healthfreak.ai
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