Sarcopenic Obesity at BMI 24

Presentation

68-year-old SA woman, vegetarian, post-menopausal, three falls in 6 months including one with wrist fracture. BMI 24, BP 138/82, HbA1c 6.0%. Lives independently but reports increasing difficulty climbing stairs and rising from chairs. Diet: 'rice and dal' twice daily, minimal protein, no resistance training ever.

Key Finding

DEXA: appendicular skeletal muscle mass index 4.8 kg/m² (sarcopenia threshold <5.5 in women), body fat 38%, T-score lumbar spine -2.1 (osteopenia). Grip strength 14 kg (sarcopenia <16 kg). 4-meter gait speed 0.7 m/s (sarcopenia <0.8). Vitamin D 16 ng/mL. Total dietary protein intake 0.6 g/kg/day (sarcopenic intake <0.8; optimal in elderly 1.2-1.6).

Intervention & Outcome

Initiated structured progressive resistance training 2x/week with supervised PT, dietary protein increased to 1.4 g/kg/day with whey protein supplementation, vitamin D3 4000 IU daily, calcium 1000 mg daily. At 6 months: grip strength 19 kg, gait speed 1.0 m/s, ASMMI 5.3, body fat 35%. No further falls. BMI was 24 throughout — body composition transformed without weight change.

First Principles

Skeletal muscle is the largest insulin-sensitive tissue, the primary glucose sink, the source of myokines (anti-inflammatory signals), and the structural reserve preventing falls. Muscle mass declines ~1% per year from age 30 unless actively maintained. SA dietary patterns (low protein, carb-heavy) and low resistance-training prevalence accelerate this loss. By age 70, an unintervened SA woman may have less than half the muscle mass of a resistance-trained peer — and the metabolic, immune, and structural consequences are profound.