Metric 01
Modified South Asian (Asian-Indian) BMI Scale
Body Mass Index (BMI) is an anthropometric measure defined as body mass divided by the square of the
body height:
BMI Calculation Formula
BMI = Weight (in kilograms) ÷ [Height (in meters)]²
Why K-CAL Uses the South Asian Scale Instead of Global WHO
Extensive clinical and epidemiological studies spearheaded by the World Health Organization (WHO
Expert Consultation, Lancet 2004), the Indian Council of Medical Research
(ICMR), and the National Institute of Nutrition (NIN) demonstrate that
South Asian populations exhibit what is known as the "thin-fat Indian phenotype".
Even at lower total body weights, individuals of South Asian origin tend to have higher percentages of
body fat, particularly dangerous visceral fat (fat surrounding abdominal organs). This
results in significantly elevated risks of Type-2 diabetes, dyslipidemia, fatty liver disease, and
coronary artery disease at BMI thresholds that Western standards consider "normal."
| Category |
South Asian Cut-off (K-CAL) |
WHO Global Cut-off |
Health Risk Level |
| Underweight |
< 18.5 |
< 18.5 |
Nutritional deficiency, lower immunity |
| Normal / Healthy |
18.5 – 22.9 |
18.5 – 24.9 |
Lowest cardiovascular & metabolic risk |
| Overweight |
23.0 – 24.9 |
25.0 – 29.9 |
Increased risk of insulin resistance |
| Obese |
≥ 25.0 |
≥ 30.0 |
High risk of cardiovascular disease & T2D |
How K-CAL Calculates "Weight to Reduce to Normal BMI"
To provide actionable feedback, K-CAL computes the maximum threshold weight that corresponds to the
upper boundary of the healthy South Asian range (BMI 22.9):
Weight Normalization Formula
Max Normal Weight = 22.9 × [Height (m)]²
Weight to Reduce = Current Weight - Max Normal Weight
Example: For a person of height 175 cm (1.75 m) weighing 80 kg:
• Max Normal Weight = 22.9 × (1.75 × 1.75) = 70.1 kg
• Target Reduction = 80 - 70.1 = Reduce 9.9 kg for Normal BMI.
Metric 02
Energy Requirements: BMR, TDEE & Deficits
To determine how many calories a user should consume daily, K-CAL relies on the internationally
validated Mifflin-St Jeor Equation, recognized by the American Dietetic Association as
the most accurate formula for predicting Basal Metabolic Rate (BMR) in healthy adults.
Step 1: Basal Metabolic Rate (BMR)
BMR represents the calories burned at absolute rest to maintain vital involuntary functions (heartbeat,
respiration, brain activity, cellular homeostasis):
Mifflin-St Jeor Equations
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
Step 2: Total Daily Energy Expenditure (TDEE)
Your BMR is adjusted based on physical activity level using validated metabolic equivalents:
| Activity Level |
Multiplier |
Description |
| Sedentary |
1.200 |
Desk jobs, driving, little to no structured exercise |
| Lightly Active |
1.375 |
Light exercise or sports 1–3 days per week |
| Moderately Active |
1.550 |
Moderate exercise or intense physical tasks 3–5 days per week |
| Very Active |
1.725 |
Hard exercise or heavy manual labor 6–7 days per week |
Step 3: Goal Caloric Adjustments
Based on your selected fitness objective in the Profile tab:
- Fat Loss (Cut):
Target = TDEE - 500 kcal. A sustained 500 kcal daily
deficit translates to approximately 3,500 kcal per week (~0.45 to 0.5 kg of safe, sustainable fat
loss). K-CAL enforces a strict 1,200 kcal safety floor to prevent metabolic
slowdown and hormonal impairment.
- Maintain:
Target = 100% of TDEE. Maintains current body mass.
- Muscle Building (Bulk):
Target = TDEE + 500 kcal. Provides the
energetic surplus necessary to support muscular hypertrophy when paired with resistance training.
Metric 03
Macronutrient Distribution & Kerala Diet Optimization
Caloric balance governs weight change, but macronutrient composition dictates whether lost weight comes
from fat or muscle, alongside regulating satiety and energy levels.
Instead of arbitrary caloric percentages that can overload protein targets during bulks or under-supply during cuts, K-CAL utilizes an evidence-based, bodyweight-anchored macronutrient methodology:
Protein (1.8 g / kg): Anchored to actual bodyweight (4 kcal/g) to optimize muscle protein synthesis (1.6–2.2 g/kg optimal range).
Healthy Fats (~27%): Scaled at 25–30% of total calories (9 kcal/g) to support hormone production and cellular health.
Carbohydrates (Remaining): Fills the remaining caloric balance (4 kcal/g) to fuel training intensity and daily cognitive energy.
Navigating Kerala Cuisine with K-CAL
Kerala's culinary heritage is rich in flavor, antioxidants, and spices, but traditional staples (such as
Kerala Parotta, Matta Rice, Appam, and Puttu) are exceptionally carbohydrate-dense. Meanwhile, curries
cooked with generous coconut milk or fried in pure coconut oil carry concentrated fats.
K-CAL helps you balance your plate by highlighting:
- High-Quality Protein Sources: Coastal fish curries (Ayala/Mackerel, Mathi/Sardines
— rich in anti-inflammatory Omega-3 fatty acids), Egg roast, Chicken chukka/ullarthiyathu, Kadala
curry (black chickpeas), Payar (green gram), and Paneer.
- Smart Fats: Retaining beneficial medium-chain triglycerides (MCTs) from coconut
while tracking total cooking oil quantities.
- Fiber-Rich Carbohydrates: Encouraging portion control for white carbs while
introducing fiber-rich local vegetables (Avial, Thoran, Cabbage, Beans).
References
Academic & Health Organization Citations
The algorithms and classifications implemented in K-CAL are grounded in peer-reviewed scientific
literature:
- WHO Expert Consultation (2004): Appropriate body-mass index for Asian
populations and its implications for policy and intervention strategies. The Lancet,
363(9403), 157-163.
- Misra, A., et al. (2009): Consensus statement for diagnosis of obesity,
abdominal obesity and the metabolic syndrome for Asian Indians and recommendations for physical
activity, medical and surgical management. Journal of the Association of Physicians of
India, 57, 163-170.
- Mifflin, M. D., St Jeor, S. T., et al. (1990): A new predictive equation for
resting energy expenditure in healthy individuals. The American Journal of Clinical
Nutrition, 51(2), 241-247.
- ICMR - National Institute of Nutrition (2020): Nutrient Requirements and
Recommended Dietary Allowances for Indians. Indian Council of Medical Research, Hyderabad.
Medical Disclaimer: K-CAL is designed as an educational, informational, and
lifestyle-tracking tool. It is not a medical device/app and should not replace personalized clinical
advice from qualified dietitians or physicians.