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There are a few things you should consider when using the dreaded scale as a method of determining your weight loss.
Body Fat Scales: Some companies, such as the Tanita, manufacture a body fat scale for home use. These scales make use of a method known as bioelectrical impedance to measure your body fat percentage. This method involves a low-level electrical current is passed through your body. Then, the "impedance", or opposition to this current is measured. The result is calculated in conjunction with your weight, height and age to determine your body fat percentage. While this may sound like the easiest way to calculate body fat, there are some caveats. For example, the amount of water in your body, your skin temperature and recent physical activity might influence the results. To ensure accuracy, do not eat or drink for four hours before taking the test, and avoid exercise or 12 hours prior to the test.