Scientists agree that the human body is about 70% water but what is it doing in there? The cells are made up of 90% water, blood 85%, our brains 80% (may vary), muscles 75% and even bones are comprised of about 30% water. A 2.2 liter bottle of it weighs almost 5 pounds. Without it we die, scientists all agree on that. It might take anywhere from 2 days to a week for the average person to die if not consuming water. Your scale is only giving you a piece of the puzzle. Drink Up!
Thanks to breathing, perspiration and our kidneys water comes and goes relatively freely through our bodies. Fat on the other hand just sits there waiting around to join the party. It's often the 1st one here and the last to leave. Understand that without fat in your body you will also succumb to death although it takes much longer to do so and rarely attained in a normal person's body. Most fat settles in at the points of least resistance and also frequently finds its way into our muscles, known as intramuscular fat. When this happens take a good look at the best beef your butcher sells. The marbling you see is intramuscular fat. So much better when it is eaten and not actually in your muscles.
We hear the term BODY MASS INDEX but do you really know what it is? Remember that the adult human body is between 60% and 65% water. I know I said 70% above but that's for everyone, newborns are about 80%, children 70% and elderly adults are at 55%. The reality is that BMI is only a number, generally derived from a formula or chart. It does not tell you how much fat is in your body. Body fat can be measured and if you're serious about weight loss it's the only way to gauge your progress accurately. In order of accuracy from least to most here are my suggestions:
Calipers - also know as the skinfold test
Electrical impedance - my preferred
Densitometry - via water displacement
DXA - Dual energy X-ray Absorptiometry
How can I impress upon everyone the importance of an accurate BODY FAT reading? Have you ever had a friend literally pass out from dieting? 99% of the time it wasn't from their lack of food it was from too little water in their bodies. The brain could no longer tolerate the perceived fat loss they were enjoying on the scale. Don't be misled by the numbers. Another example is "Reunion" time! A month before your event you hunker down into diet mode, yes, you eat less but you forget about protein. A month worth of salads are not going to give you the nutrients your muscles need. Ten pounds lighter but no energy left to dance!