Caffeine is a diuretic , if the soft drinks had caffeine and the person drank them regularly then the body is dependent on this stimulant to help the kidneys and there will be water retention for several weeks which will actually make you gain weight temporarily. Usually this will resolve itself within a couple of months as long as you watch salt intake during that time. This is true for the BP meds that act as a diuretic, if you stop them for several days expect to gain weight.
disclaimer: I am not a Dr and am not giving medical advice, nor am I a weight loss expert
disclaimer: I am not a Dr and am not giving medical advice, nor am I a weight loss expert