Thats just water weight. The thing with water retention is that if you dont understand what is going on you can get pretty discouraged by the excess water weight.

Body Fat Percentage Guide 7 Ways To Measure And Lower It
Water retention body fat measurement. It takes longer for fat to register on the scale. So its all relative. Water retention is exaggerated on flights due to the air pressure changes slowing down circulation and encouraging your body to hold onto water. The average percentage of body weight that is water will remain above 50 percent. Its actually quite a helpful signal because it lets us know that something is out of balance in the body. To gain just one pound of fat youd have to eat 3500 calories more than what you need.
Aside from regularly getting your body fat measured theres no foolproof way but if your weight is fluctuating a lot or you lost a lot of weight really quickly thats likely water weight. Dehydration or water retention is another factor that will affect the dial on the scale especially for women as their weight changes throughout the month. Try to move at least every hour taking a lap up and down the plane as well as working head down stretching your neck shoulders wrists upper and lower back etc. Remember we want to measure body fat and not just weight. Dietitian monica reinagel told livestrong that it can take several weeks for fat weight to build up in your body. On the other hand if youre slowly losing weight while following a healthy diet and exercise plan and your body is starting to look leaner its probably fat that youre losing.
Years is due in large part to having more body fat and less fat free. Cause fluid retention in the body. If youve been losing weight for awhile especially if you are moving below 30 body fat and into the mid or low 20s remember that weight loss will slow down and will probably become extremely inconsistent. If you are above 7 or 8 body fat and youre looking to get extremely lean from water loss it probably wont happen. Contrary to popular belief water retention is not the enemy. Water retention and the jumpy scale.
Body mass index body mass index bmi is simply a measure of your weight relative to your height. Before you start to drop water weight though it is wise to know if you are lean enough to even begin considering it.