Weight & BMI Tracking

Monitor body weight and body mass index for cardiovascular health

What are Weight and BMI?

  • Body Weight - Your total body mass in kilograms (kg) or pounds (lbs)
  • BMI (Body Mass Index) - Weight-to-height ratio calculated as weight (kg) / height² (m²)

Example: A person weighing 70 kg at 1.75 m tall has a BMI of 70 / (1.75²) = 22.9 kg/m²

Why Weight and BMI Matter for Cardiovascular Health

  • Excess weight increases cardiovascular disease risk
  • Associated with hypertension, diabetes, and dyslipidemia
  • Weight loss can improve blood pressure and metabolic health
  • Rapid weight changes may indicate fluid retention or other health issues

📊 BMI limitations: BMI doesn't distinguish muscle from fat. Athletes and muscular individuals may have "high" BMI despite being healthy. Discuss your target range with your clinician.

BMI Categories (CDC)

Underweight

<18.5 kg/m²

May indicate malnutrition or underlying health conditions.

Healthy Weight

18.5 - 24.9 kg/m²

Associated with lower cardiovascular disease risk.

Overweight

25.0 - 29.9 kg/m²

Increased health risks. Lifestyle modifications recommended.

Obesity

≥30.0 kg/m²

Significantly increased cardiovascular risk. Medical evaluation recommended.

⚠️ Context matters: BMI is a screening tool, not a diagnostic. Age, sex, muscle mass, and ethnicity affect interpretation. Consult your clinician for personalized targets.

How Cardio Analytics Uses Weight and BMI Data

  • Tracks weight trends - Visualize changes over days, weeks, and months
  • Computes BMI automatically - Using height from HealthKit and current weight
  • Highlights clinically relevant changes - Alerts for rapid weight gain/loss
  • Medication correlations - See how medications (e.g., diuretics, beta blockers) affect weight
  • Blood pressure correlations - Track relationship between weight and BP
  • Write-back to HealthKit - Manual weight entries sync to Apple Health

HealthKit Data Types

Cardio Analytics reads weight data from Apple HealthKit using this identifier:

  • bodyMass - Weight in kilograms (kg) (Apple Docs)
  • height - Height in meters (m), used to calculate BMI

Learn More About HealthKit Integration

Tips for Accurate Weight Tracking

  • Weigh at the same time daily - Morning after using the bathroom, before eating
  • Use the same scale - Different scales can vary by 1-2 kg
  • Minimal clothing - Weigh without shoes for consistency
  • Track trends, not daily fluctuations - Weight varies 0.5-2 kg day-to-day due to water, food, etc.
  • Use a validated scale - Smart scales that sync to HealthKit automate tracking

Track Your Weight & BMI with Cardio Analytics

Monitor body weight and BMI trends with medication and blood pressure correlations.

Download on App Store