FAQ from Longist
What is Longist?
Longist is the first AI-powered food tracker designed exclusively for longevity—not weight loss, not macros, but *healthy lifespan extension*. It translates every meal into its biological impact using predictive models trained on global nutrition databases and longitudinal aging studies. By analyzing food composition, processing methods, and synergistic nutrient interactions, Longist delivers an intuitive, minute-by-minute view of how your diet shapes your future vitality.
How to use Longist?
No setup. No learning curve. Open the app, point your camera, and tap: → Photo of your breakfast bowl? Instant organ-system scoring. → Scrolling a sushi menu? See which rolls support mitochondrial biogenesis—and which may accelerate epigenetic aging. → Barcode of a protein bar? Get transparency on sugar alcohols, ultra-processing markers, and phytonutrient gaps. Then let your AI Longevity Coach turn insights into action—tailored to your Apple Health trends, personal goals, and even your circadian rhythm.
How does Longist calculate minutes added or lost from my life?
Longist uses a proprietary longevity algorithm anchored in the Health Nutritional Index (HNI), validated across 5.8K+ foods in the Nature Food study. It cross-references ingredient profiles against 12 key longevity pathways—including insulin sensitivity, oxidative stress, gut microbiome modulation, and DNA repair efficiency—then weights each factor based on your age, sex, activity level, and biometric history. The result? A dynamic, personalized estimate—not of theoretical lifespan, but of *healthspan minutes* directly attributable to that meal.
Is Longist science-backed?
Absolutely. Every insight traces back to peer-reviewed literature: the Blue Zones dietary patterns, the PREDIMED trial on Mediterranean eating, the Framingham Heart Study on nutrient-dense fats, and emerging research on senolytic foods and NAD+ precursors. Longist’s database is continuously updated as new clinical trials and meta-analyses are published—ensuring your guidance evolves with the science.
What do the scores mean?
Your Longevity Score reflects net impact on *healthspan*, not just lifespan. Green (+) = supports resilience across multiple systems (e.g., walnuts scoring high for brain + cardiovascular + gut health). Yellow (±) = neutral or context-dependent (e.g., white rice may be fine with fiber-rich sides but less optimal alone). Red (–) = repeated consumption correlates with accelerated biological aging markers in population studies. Think of it as your food’s “biological ROI.”
Does Longist track calories or macros?
No—and intentionally so. Calories ignore food quality; macros overlook synergy and bioavailability. Longist focuses on what matters most for longevity: phytochemical diversity, mitochondrial support, anti-glycation potential, and microbiome nourishment. You’ll know *why* lentils outperform isolated protein powder—not just how much protein they contain.
What if I eat mixed meals or restaurant dishes?
That’s where Longist shines. Its multimodal AI identifies up to 15 ingredients simultaneously—even in complex dishes like biryani, ramen, or grain bowls—then models their combined physiological effects. No need to deconstruct your meal: just snap, and get integrated insights on inflammation load, antioxidant capacity, and tissue-specific benefits.
Is my health data private?
Yes—by design. Longist follows zero-knowledge architecture: your Apple Health data never leaves your device. Meal photos are processed locally via on-device AI where possible; when cloud analysis is needed (e.g., for novel menu items), images are deleted immediately after scoring. We don’t sell, rent, or monetize your data—ever.
Can Longist help me lose weight?
While weight management isn’t its primary focus, users consistently report sustainable, non-restrictive weight normalization as a side effect of optimizing for longevity. Why? Because foods that extend healthspan—whole plants, fermented foods, low-AGE proteins—are naturally satiating, metabolically supportive, and anti-inflammatory. Longist helps you build habits that last decades—not just until the next diet ends.
Is it free to try?
Yes. The core experience—meal scanning, longevity scoring, nutrient gap analysis, and basic Apple Health integration—is completely free. Premium features (e.g., advanced biomarker forecasting, personalized longevity roadmaps, cohort-based coaching) are available via optional subscription—but never required to start gaining years of healthy life.