Weight Loss Calorie Tracker with AI & Science
Feature tour
See it in action
Swipe through screenshots of the app
Track your weight
Fitness tracker sync
Weight Forecast
AI Food Scanner
Activity impact
Caloric Deficit & BMI
CO₂e, gluten & macros
Fasting & activity
Everything in the app
What makes LyteFast different
Science-backed features for sustainable weight management
AI Muscle Rating
Weight Forecast
Budget-Based Calories
AI Food Scanner
Barcode Scanner
Fasting Insights
Calorie Deficit
Carbon Footprint
Gluten Status
Activity Tracking
Shareable Progress
The science
Research Backing LyteFast
Peer-reviewed references supporting weight forecasting, energy balance, carbon footprint of diets, gluten detection, nutrition databases, and AI food analysis.
Weight Forecast
Weight forecasting uses predictive models based on energy balance principles to project future weight trends from recent data. Research shows that self-monitoring of weight and calorie intake, combined with trend smoothing to reduce day-to-day noise, helps people understand their trajectory and make timely adjustments. Short-horizon predictive modeling turns your recent trajectory into actionable forecasts that support adherence and long-term habits.
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Critical analysis of dual-energy x-ray absorptiometry-measured body composition changes with voluntary weight loss.
Obesity (Silver Spring, Md.) · 2025
Demonstrates the importance of accurate body composition measurement in tracking weight changes, supporting the need for trend smoothing in weight forecasting models.
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Exercise and eating motivation in weight loss maintenance: revisiting the motivational spillover with the NoHoW study.
Annals of behavioral medicine : a publication of the Society of Behavioral Medicine · 2025
Shows how self-monitoring and feedback mechanisms support long-term weight maintenance, validating the approach of providing clear forecasts and trend visualization.
Budget-Based Calories
Pre-set calorie budgets with clear "within budget" or "over budget" feedback help users make informed food choices in real-time. Research demonstrates that this decision-support approach improves adherence to calorie goals by reducing cognitive load and providing immediate, actionable feedback. The simple "spend vs. budget" framework aligns with behavioral economics principles that show people make better decisions when they have clear constraints and instant feedback on their choices.
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Exercise and eating motivation in weight loss maintenance: revisiting the motivational spillover with the NoHoW study.
Annals of behavioral medicine : a publication of the Society of Behavioral Medicine · 2025
Shows that structured goal-setting and feedback mechanisms improve adherence to dietary targets, supporting the budget-based calorie approach.
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Intermittent fasting plus early time-restricted eating versus calorie restriction and standard care in adults at risk of type 2 diabetes: a randomized controlled trial.
Nature medicine · 2023
Demonstrates that structured calorie management approaches improve adherence and outcomes compared to standard care.
Calorie Deficit & Energy Balance
Energy balance—the relationship between calories consumed and calories burned—is the primary driver of weight change. Research consistently shows that creating a calorie deficit leads to weight loss, while a surplus leads to weight gain. Visualizing this deficit in real-time helps users understand how their daily choices impact their progress toward goals. The app translates energy balance into plain language, showing the gap between current intake and target, and what changes can close that gap.
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Critical analysis of dual-energy x-ray absorptiometry-measured body composition changes with voluntary weight loss.
Obesity (Silver Spring, Md.) · 2025
Confirms that energy balance is the fundamental mechanism driving weight change, validating the calorie deficit approach.
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Intermittent Fasting versus Continuous Calorie Restriction: Which Is Better for Weight Loss?
Nutrients · 2022
Shows that calorie deficit, regardless of timing, drives weight loss, supporting the energy balance principle.
AI Food Scanner
Artificial intelligence and machine learning enable automated food recognition from photos, text descriptions, and barcode scanning. Research shows that AI-powered nutrition estimation can provide reasonable accuracy for common foods, helping users log meals more quickly and consistently. The combination of photo analysis, barcode scanning, and text parsing creates multiple pathways for food logging, reducing barriers to self-monitoring and improving adherence to calorie tracking.
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DietAI24 as a framework for comprehensive nutrition estimation using multimodal large language models.
Communications medicine · 2025
Demonstrates how AI and large language models can accurately estimate nutrition from food images and descriptions.
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Extract Nutritional Information from Bilingual Food Labels Using Large Language Models.
Journal of imaging · 2025
Shows that AI can extract nutrition information from food labels, supporting barcode and text-based food logging.
Carbon Footprint
Food production accounts for a significant portion of global greenhouse gas emissions. Research shows that different foods have vastly different carbon footprints, and dietary choices can substantially impact environmental sustainability. Tracking the carbon footprint of meals helps users understand the environmental impact of their food choices and make more sustainable decisions. Studies demonstrate that even small dietary changes can meaningfully reduce carbon emissions.
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Sustainable diets reduce diet-related greenhouse gas emissions and improve diet quality: results from the MyPlanetDiet randomized controlled trial.
The American journal of clinical nutrition · 2025
Shows that sustainable dietary patterns can reduce greenhouse gas emissions while improving diet quality, validating carbon footprint tracking.
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Are healthier diets more sustainable? A cross-sectional assessment of 8 diet quality indexes and 7 sustainability metrics.
The American journal of clinical nutrition · 2025
Demonstrates the relationship between diet quality and environmental sustainability, supporting carbon footprint awareness in food choices.
Gluten Detection
For people with celiac disease or gluten sensitivity, avoiding gluten is essential for health. Research shows that even small amounts of gluten can cause symptoms and long-term damage in sensitive individuals. Barcode scanning and food analysis can help identify gluten-containing products, providing quick screening to support gluten-free dietary adherence. While the app provides indicators based on product information, it's important to note that it's an estimator and not a replacement for careful label reading or medical guidance.
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Diagnostic Accuracy of IgA Anti-Transglutaminase Assessed by Chemiluminescence: A Systematic Review and Meta-Analysis.
Nutrients · 2024
Reviews diagnostic methods for celiac disease, highlighting the importance of accurate gluten detection for those with celiac disease.
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Recent advancements in the sensors for food analysis to detect gluten: A mini-review [2019-2023].
Food chemistry · 2024
Reviews technological approaches to gluten detection in foods, supporting the use of food analysis for gluten screening.
What's free, what's not
Free
- Weight tracking
- Activity tracking
- Apple Health sync
- Share
Base Access
- Weight Forecast
- Calorie Deficit
- Fasting Insights
- Carbon Footprint
- Gluten Status
AI Add-On
- AI Food Scanner
- Barcode Scanner
- AI Body Preview
- AI Muscle Rating
Ready to start your journey?
Download LyteFast today
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