A healthy weight is not always reflected by the bathroom scale. Knowing your body composition ratio of fat-to-lean body mass is a much more accurate and objective measure of your health and fitness.
Body weight is deceptive and unreliable because as we all know our body weight can change by a lot day-to-day, hour-by-hour, simply from the foods we eat. For example, a salty meal can leave you bloated and unable to button your favorite jeans, and a night of unhealthy foods can leave you constipated.