Be sure to read the labels on canned foods, boxed mixes, and frozen dinners. Women may also retain several pounds of water prior to menstruation. This is very common and the weight will likely disappear as quickly as it arrives. Another factor that can influence the scale is glycogen. Think of glycogen as a fuel tank full of stored carbohydrate.
Some glycogen is stored in the liver and some is stored the muscles themselves.
This energy reserve weighs more than a pound and it's packaged with 3- 4 pounds of water when it's stored. Your glycogen supply will shrink during the day if you fail to take in enough carbohydrates. As the glycogen supply shrinks you will experience a small imperceptible increase in appetite and your body will restore this fuel reserve along with it's associated water. It's normal to experience glycogen and water weight shifts of up to 2 pounds per day even with no changes in your calorie intake or activity level. These fluctuations have nothing to do with fat loss, although they can make for some unnecessarily dramatic weigh-ins if you're prone to obsessing over the number on the scale.