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Metabolism & Energy APIs

Welcome to the Metabolism & Energy suite of Health Fitness API – designed to empower your apps with accurate energy calculations, calorie estimations, and metabolic insights.

From BMR and TDEE to EER, Katch-McArdle, and Basal Energy Expenditure, these endpoints help fitness platforms, nutrition apps, wellness tools, and enterprise health systems deliver personalized energy guidance to users.

Leverage low-latency, real-time API responses, multi-language support, and high-concurrency infrastructure for reliable calculations at scale.

Key Features

  • Comprehensive Energy Metrics: BMR, RMR, TDEE, EER, maintenance calories, BEE, and metabolic adaptation risk.
  • Predictive Insights: Identify potential metabolic adaptation or energy deficiencies.
  • Multi-Language Support: Localize responses in 8 languages (en, es, de, fr, pt, ja, hi, ar).
  • Enterprise Ready: SLA-backed uptime, private deployments, and optimized for high-volume apps.
  • Secure: All endpoints require API key authentication.

Available Endpoints

Endpoint Description
BMR API Basal Metabolic Rate calculation based on weight, height, age, and gender.
RMR Calculator API Resting Metabolic Rate calculator using Mifflin or Harris formula.
TDEE API Total Daily Energy Expenditure based on activity level and goal.
EER API Estimated Energy Requirement using population-standard equations.
Katch-McArdle Calculator API Energy expenditure for lean body mass-based calculations.
Maintenance Calorie API Determine daily calories needed to maintain current weight.
Basal Energy Expenditure (BEE) API Energy needed at complete rest for vital functions.
Metabolic Adaptation Risk API Identify risk of adaptive thermogenesis during calorie restriction or overfeeding.

Why Use Metabolism & Energy APIs?

  • Accurate & Validated: Calculations follow recognized clinical and research-based formulas.
  • Enterprise-Grade Performance: Low-latency, high-concurrency APIs for production systems.
  • Multi-Language Friendly: Ideal for apps targeting international audiences.
  • Predictive & Actionable: Provides guidance for nutrition planning, weight management, and metabolic health.
  • Secure & Scalable: Supports admin/developer/finance roles for enterprise clients.

Quick Example – TDEE API

curl -X GET "https://api.hefitapi.com/api/v1/tdee?gender=male&age=34&weight=82&height=178&activity_level=moderately_active&equation=mifflin&lang=en" \
  -H "X-API-Key: YOUR_API_KEY"

Response Example

Info

The response example below is for demonstration purposes only. Make a live request to this endpoint to receive the full, real-time, and potentially richer JSON structure.

{
  "TDEE": "2758.13 kcal/day",
  "Gender": "Male",
  "Age": "34 yr",
  "Weight": "82.0 kg",
  "Height": "178.0 cm",
  "Activity Level": "Moderately Active",
  "BMR": "1779.44 kcal/day",
  "tdee_kcal_per_day": 2758.13,
  "bmr_kcal_per_day": 1779.44,
  "activity_multiplier": 1.55,
  "equation_used": "mifflin",
  "energy_band": "high",
  "energy_band_label": "High",
  "goal_targets_kcal_per_day": {"fat_loss": 2344, "maintenance": 2758, "muscle_gain": 3034},
  "risk_signal": "Higher intake profile requires precision for composition goals.",
  "action_plan": ["Track weekly trend and adjust in small steps"],
  "monitoring_plan": "Review trend and intake adherence weekly.",
  "language": "en",
  "_enterprise": {"client": "Acme Health", "plan": "pro", "request_id": "f57b7f25a5607f29", "quota": 120, "usage_tracking": true},
  "_api_metadata_": {"endpoint_name": "tdee", "response_language": "en"}
}

Next Steps

  • Explore each endpoint for detailed parameters, request examples, and response structures.
  • Combine with Body Composition endpoints for holistic fitness insights.
  • Integrate with Nutrition & Diet APIs for personalized meal planning.
  • Monitor usage via HefitAPI Dashboard, manage multi-user roles, and scale confidently.

Deliver real-time energy and metabolism insights to your users with Health Fitness API – accurate, scalable, and enterprise-ready.