Minimum sample size of n = 1400: 700 mostly healthy people (50% women, aged 18-100 years, BMI 16.5 to 39.9 kg / m²), 420 underweight individuals (50% women, 18 years to 100 years, BMI from 14.0 to 16.4 kg/m²), 280 morbidly obese (50% women,18 years to 100 years, BMI 40.0-49,9 kg/m²).