A few years back I decided to see exactly how much my total intake for everything I ate or drank actually weighed in one day. This included all drinks, water, coffee, etc. food, everything I put into my mouth. It came to a total of 13 pounds, but when I stepped on the scale the next morning....I had lost one pound. So, it's a total mystery exactly what happens to what we put in, and how it can leave again so quickly. I don't recall going to the bathroom all that much, and I did not have a BM (TMI....just emphasizing my point) We use it for heating, breathing, scratching our butts..... when you step on the scale it depends on where you catch your body at during it's process as to what it will record. Try logging the weight of everything you intake in one day, tare your empty cup or glass and plates and be amazed at how much you put in - in a single day, then weigh the next morning and you won't see that much of an increase...if any, it's astounding and then you get a better idea of why the scale is not a true marker for your progress.