Thanks for the comprehensive list, James. I drummed up a few more...
AKA = also known as; above-the-knee amputation
BBF = best buddy forever
BKA = better known as; below-the-knee amputation
BL = baseline
CC = cardiac clearance
CHO = carbohydrates
CV = cardiovascular
EBW = excess body weight
FDL = fleur de lis (a type of tummy tuck)
FNP = family nurse practitioner
GW = goal weight
HLD = hyperlipidemia
HTN = hypertension
IIFYM = if it fits your macros (macronutrients)
LBL = lower body lift
LW = lowest weight
MCD = Medicaid
MCR = Medicare
MD = doctor of medicine (physician)
MGB = mini gastric bypass
MO = morbidly obese
MVI = multivitamins
OA = osteoarthritis
OP = original poster, original post
PA = physician assistant
PS = plastic surgery, plastics
Psych = psychotherapist, psychiatrist, psychologist
SILS = single incision laporascopic surgery
SMO = super morbidly obese
UBL = upper body lift
UR = "you're" or "you are"
VBG = vertical banded gastroplasty
YMMV = your mileage may vary