I,ve heard the body does not gain fat if one has a day of overeating now and then. But is was wondering if it is possible to gain much bodyfat if one has as large meal of junk food before bed. I did that 3 days ago and I,m also a diabetic so obvisously i had to take a large dose of insulin and the next day the scale showed i,d gained couple of kg,s. I dont know if this is water or fat....