25OHD	serum concentration serum concentration of vitamin D
BMI	body mass index; BIA, bioelectrical impedance analysis
FM	fat mass
T1DM	type 1 diabetes
T2DM	type 2 diabetes
NHANES	National Health and Nutrition Examination Survey
PTH	parathyroid hormone
HbA1c	glycated hemoglobin
DSM	Diagnostic and Statistical Manual of Mental Disorders
WHO	World Health Organization
kHz	kilohertz
ESPEN	European Society of Parental and Enteral Nutrition
PhA	phase angle
Xc	reactance
R	resistance
CVs	coefficients of variation
FFM	free fat mass
TBW	total body water
ECW	extra-cellular water
ICW	intra-cellular water