Speaking from the medical side I have personally experienced and also had many of my patients with low Potassium and high incidences of Billiary Cholic.
So... Over weight by more than 60+ lbs / 30 Kilos and then loosing more than half that weight over 4 months look out...
__________________
No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)