diet-calc

diet-calc is a Rust library that allows users to calculate key nutritional and health metrics:

• Body Mass Index (BMI)
• Basal Metabolic Rate (BMR)
• Total Daily Energy Expenditure (TDEE)
• Waist-to-Height Ratio (WHtR)
• Body Adiposity Index (BAI)

These metrics assist dietitians and health-conscious individuals in assessing body composition and daily caloric requirements.

Features

• BMI Calculation: Evaluates body weight status.
• BMR Calculation: Calculates resting caloric needs.
• TDEE Calculation: Estimates daily caloric expenditure based on activity level.
• WHtR Calculation: Assesses abdominal obesity risk.
• BAI Calculation: Estimates body fat percentage without direct body composition measurement.

Formulas Used

BMI (Body Mass Index)

BMI categories according to the World Health Organization (WHO):

• Underweight: <18.5
• Normal weight: 18.5–24.9
• Overweight: 25–29.9
• Obesity: ≥30

BMR (Basal Metabolic Rate)

BMR calculated using the Mifflin-St Jeor equation (Mifflin et al., 1990):

TDEE (Total Daily Energy Expenditure)

TDEE is BMR multiplied by an activity factor (source)

• Sedentary: BMR × 1.2
• Lightly active: BMR × 1.375
• Moderately active: BMR × 1.55
• Very active: BMR × 1.725
• Super active: BMR × 1.9

WHtR (Waist-to-Height Ratio)

WHtR values >0.5 indicate increased cardiovascular and metabolic risk (Browning et al., 2010).

BAI (Body Adiposity Index)

BAI estimates body fat percentage:

Formula from Bergman et al., 2011.

System Requirements

• Rust programming language (1.65+)

Installation

Clone, build, and run the project:

git clone https://github.com/mycotoxin/diet-calc.git
cd diet-calc
cargo build --release

use diet_calc::formulas::bmi;
use uom::si::f32::{ Length, Mass};
use uom::si::length::centimeter;
use uom::si::mass::kilogram;

fn main() {
    let bmi: f32 = bmi(Mass::new::<kilogram>(70.0), Length::new::<centimeter>(184.0)).unwrap();
    println!("BMR Result is: {} ", bmi);
}

License

This project is licensed under the MIT License. See the LICENSE file for details.