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Measuring obesity or body fat percentage precisely needs specialized equipment designed to measure someone underwater. Thankfully there are easier ways to measure body fat, for example skinfold calipers which measure the thickness of the fat layer under the skin. A popular gadget on modern bathroom scales is a technology called bioelectrical impedance analysis (BIA) which estimates the  percentage of water in the body by passing a minor electric current through it. BIA can then convert this into an estimate of body fat percentage.

If you're confused about the seemingly conflicting diet and nutrition advice freely available today, this well-researched nutrition facts in this article on nutrition expose the myths about calories and diet, food ratios, food groups, macro nutrients, etc.