✨ Available in 151 Languages

Weight Loss Calorie Tracker with AI & Science

NEW: AI Body Preview generates a goal-physique visualization. Muscle Rating scores 8 muscle groups from a photo. Plus weight forecast, calorie tracking & AI food scan.

AI Body Preview Muscle Rating Weight Forecast Carbon Footprint Gluten Detection

Recorded in the app — every screen shown in your language.

Features

See it in action

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Your Weight Loss Journey

Your Weight Loss Journey

Visualize your progress from start to target weight

Apple Health Integration

Apple Health Integration

Sync your fitness tracker. Visualize weight impact by workout intensity. No tracker? Our 'Add Activity' feature covers 45+ sports

Weight Forecast

Weight Forecast

See milestone dates, your daily plan — and whether you're on track for your summer body

AI Food Scanner

AI Food Scanner

Snap a photo and get instant calorie estimates

Exercise Log

Exercise Log

See calories burned and what they mean

Calorie Deficit

Calorie Deficit

See how far you are from goal—and the real reasons behind it

Reduce Your Carbon Footprint

Reduce Your Carbon Footprint

Track and reduce CO2 emissions from your food choices while losing weight

Visualize Fasting impact

Visualize Fasting impact

Visualize fasting windows—and their direct effect on your weight

Features

What makes LyteFast different

Science-backed features for sustainable weight management

AI

AI Body Preview

See an AI-generated photo of your body at your goal weight

AI

Muscle Rating

AI scores your muscle groups from a photo and shows how you rank

BASE

Weight Forecast

Project your weight trend from recent data and goals with the Auto-Zoom chart.

BASE

Budget-Based Calories

Budget-based calorie tracking - a simple 'spend vs. budget' approach

AI

AI Food Scanner

Take a photo, receive instant calorie estimates with 50 scans daily.

AI

Food Barcode Scanner

Scan barcodes for precise instant calorie estimates and gluten status

BASE

Visualize Fasting impact

Visualize fasting windows—and their direct effect on your weight

BASE

Calorie Deficit

View your daily deficit/surplus against your target with visual charts.

BASE

Carbon Footprint

Track the environmental impact (CO₂e) of your food choices

BASE

Gluten Detection

Gluten indicators based on barcode scanning and meal analysis

FREE

Exercise Log

Sync your fitness tracker. Visualize weight impact by workout intensity. No tracker? Our 'Add Activity' feature covers 45+ sports

FREE

Share

Animated %-to-goal gauge + exclusive Auto-Zoom weight chart with prediction—see progress and when milestones hit.

Science-Backed

Research Supporting 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 employs predictive models grounded in energy balance principles to estimate future weight trends based on recent data. Research indicates that self-monitoring of weight and calorie intake, along with trend smoothing to mitigate daily fluctuations, aids individuals in comprehending their trajectory and making timely adjustments. Short-horizon predictive modeling transforms your recent trajectory into actionable forecasts that promote adherence and foster long-term habits.

Budget-Based Calories

Pre-set calorie budgets with clear "within budget" or "over budget" feedback assist users in making informed food choices in real-time. Research indicates that this decision-support strategy enhances adherence to calorie goals by minimizing cognitive load and offering immediate, actionable feedback. The straightforward "spend vs. budget" framework aligns with principles of behavioral economics, which suggest that individuals make better decisions when they have clear constraints and receive instant feedback on their choices.

Calorie Deficit & Energy Balance

Energy balance—the relationship between calories consumed and calories burned—is the primary factor influencing weight change. Research consistently indicates that establishing a calorie deficit results in weight loss, whereas a surplus results in weight gain. Visualizing this deficit in real-time aids users in comprehending how their daily choices affect their progress towards their goals. The app simplifies the concept of energy balance, illustrating the difference between current intake and target, as well as the adjustments needed to bridge that gap.

AI Food Scanner

Artificial intelligence and machine learning facilitate automated food recognition through photos, text descriptions, and barcode scanning. Research indicates that AI-driven nutrition estimation can achieve reasonable accuracy for common foods, assisting users in logging meals more efficiently and consistently. The integration of photo analysis, barcode scanning, and text parsing generates various methods for food logging, thereby lowering barriers to self-monitoring and enhancing adherence to calorie tracking.

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.

Gluten Detection

For individuals with celiac disease or gluten sensitivity, it is crucial to avoid gluten for their health. Research indicates that even minimal amounts of gluten can trigger symptoms and cause long-term harm in sensitive individuals. Barcode scanning and food analysis can assist in identifying products that contain gluten, offering a rapid screening method to support adherence to a gluten-free diet. While the app provides indicators based on product information, it is important to understand that it serves as an estimator and should not replace thorough label reading or professional medical advice.

Unlock Premium Access

Track your weight with budget-based calorie control and motivating charts

FREE

  • Your Weight Loss Journey
  • Exercise Log
  • Apple Health Integration
  • Share

Base Access

  • Weight Forecast
  • Calorie Deficit
  • Visualize Fasting impact
  • Carbon Footprint
  • Gluten Detection

Unlock AI Features

  • AI Food Scanner
  • Food Barcode Scanner
  • AI Body Preview
  • Muscle Rating

Ready to start your journey?

Download LyteFast today and get your 3-day free trial.

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