Health Information & Sources
Kalee's health calculations and AI-powered nutrition analysis are based on established medical standards and peer-reviewed scientific research. All calculations are estimates and should not replace professional medical advice.
Body Mass Index (BMI) Calculations
BMI Formula & Classification
BMI is calculated using the standard formula: BMI = weight (kg) / height (m) squared or BMI = weight (lbs) / height (inches) squared x 703
WHO BMI Classifications:
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5-24.9
- Overweight: BMI 25.0-29.9
- Obese: BMI 30.0 or greater
World Health Organization standard classification for BMI ranges used to assess weight status in adults.
WHO BMI GuidelinesCDC BMI Guidelines
Centers for Disease Control and Prevention BMI guidelines for adults, including considerations for different populations.
CDC BMI InformationCalorie & Metabolism Calculations
Harris-Benedict Equation (Revised)
Revised Harris-Benedict equation for calculating Basal Metabolic Rate (BMR), updated in 1984 for improved accuracy in modern populations.
Men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age)
Women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age)
Roza AM, Shizgal HM. "The Harris Benedict equation reevaluated: resting energy requirements and the body cell mass." Am J Clin Nutr. 1984;40(1):168-82.
Mifflin-St Jeor Equation
More accurate BMR calculation method that research shows outperforms Harris-Benedict in 70-82% of individuals. Recommended by clinical guidelines when indirect calorimetry is unavailable.
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161
Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. "A new predictive equation for resting energy expenditure in healthy individuals." Am J Clin Nutr. 1990;51(2):241-7.
Physical Activity Level (PAL) Values
Activity factors used by Kalee for calculating Total Daily Energy Expenditure (TDEE) from BMR, based on WHO/FAO/UNU Expert Consultation.
Sedentary: BMR × 1.2 (little to no exercise)
Lightly Active: BMR × 1.375 (light exercise 1-3 days/week)
Moderately Active: BMR × 1.55 (moderate exercise 3-5 days/week)
Very Active: BMR × 1.725 (hard exercise 6-7 days/week)
Extremely Active: BMR × 1.9 (very hard exercise, physical job)
FAO/WHO/UNU. "Human Energy Requirements: Report of a Joint FAO/WHO/UNU Expert Consultation." Rome, 2001.
Recent Validation Studies
Clinical research comparing BMR prediction equations shows important accuracy differences:
- Mifflin-St Jeor accuracy: 70-82% of individuals within 10% of measured values
- Harris-Benedict accuracy: 38-80% of individuals within 10% of measured values
- Clinical recommendation: Mifflin-St Jeor preferred when indirect calorimetry unavailable
- Population considerations: Accuracy may be reduced in obese populations and specific demographic groups
Amirkalali B, Hosseini S, Heshmat R, Larijani B. "Comparison of Harris Benedict and Mifflin-ST Jeor equations with indirect calorimetry in evaluating resting energy expenditure." Indian J Med Sci. 2008;62(7):283-90.
Frankenfield D, Roth-Yousey L, Compher C. "Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review." J Am Diet Assoc. 2005;105(5):775-89.
Total Daily Energy Expenditure (TDEE) Research
TDEE Components & Composition
Research shows TDEE consists of four main components, with BMR being the largest contributor to total energy expenditure:
- Basal Metabolic Rate (BMR): 60-70% of TDEE
- Thermic Effect of Food (TEF): 8-10% of TDEE
- Physical Activity Energy Expenditure: 15-25% of TDEE
- Non-Exercise Activity Thermogenesis (NEAT): Variable component
Westerterp KR. "Physical activity and physical activity induced changes in body composition in relation to energy balance." Proc Nutr Soc. 2018;77(1):20-26.
2024 TDEE & Weight Management Research
Recent comprehensive review examining TDEE's role in weight management and metabolic health:
- Weight Loss Maintenance: Successful maintainers show higher physical activity energy expenditure (812±268 vs 621±285 kcal/day in controls)
- Age-Related Changes: TDEE follows 3 phases - incline, stable, and decline according to age groups
- Individual Variation: TDEE can vary significantly between individuals of similar characteristics
- Clinical Application: TDEE measurement crucial for personalized nutrition interventions
Comprehensive Review on BMI, TDEE, BMR, and Calories for Weight Management: Insights into Energy Expenditure and Nutrient Balance for Long-Term Well-Being. ResearchGate. 2024.
Thomas DM, et al. "Physical Activity Energy Expenditure and Total Daily Energy Expenditure in Successful Weight Loss Maintainers." Obesity. 2019;27(3):496-504.
AI & Food Recognition Technology
Google Gemini AI
Advanced multi-modal AI model used by Kalee for food image recognition and nutritional analysis. Trained on extensive food datasets for accurate identification and portion estimation.
Learn about Gemini AIAI Accuracy & Limitations
Kalee's AI technology achieves 80-90% accuracy under optimal conditions with clear, well-lit food images. Accuracy may vary based on image quality, lighting, and food complexity.
Important Medical Disclaimer
- All nutritional calculations and health assessments are estimates based on established formulas and average values
- Individual nutritional needs vary significantly based on age, gender, activity level, metabolism, and health conditions
- BMI calculations may not be appropriate for athletes, pregnant women, or individuals with certain medical conditions
- Always consult with healthcare professionals before making medical or dietary decisions
- Kalee is designed to support healthy lifestyle choices but does not provide medical advice
- AI analysis results should be used as estimates only and may contain errors
Data Accuracy & Updates
Kalee is committed to maintaining accuracy in our health calculations:
- Scientific Standards: All formulas based on peer-reviewed research and established medical guidelines
- AI Model Updates: Continuous improvement based on user feedback and expanded training data
- Formula Verification: Regular review of calculation methods against current medical standards
- Transparency: Open documentation of all calculation methods and data sources