I started my journey this summer with 19% body fat, at the upper range of what would be considered acceptable for percentage body fat. The measurement is based on the principle of impedance, the transmission of electrical current through various body tissues, with fat creating the most resistance and muscle the least, based on its higher water content.
1 Reference for 5%: Blackburn G. (1995). Effect of degree of weight loss on health benefits. Obesity Research 3: 211S-216S. Reference for 10%: NIH, NHLBI Obesity Education Initiative. Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults. Available online: http://www.nhlbi.nih.gov/guidelines/obesity/ob_gdlns.pdf [PDF-1.25MB]

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Why it's dangerous: Arsenic is highly toxic in its inorganic form and in high doses. According to the World Health Organization it can also cause health problems such as skin lesions and cancer when consumed through food or drinking water. The symptoms of arsenic poisoning include vomiting, nausea, diarrhoea, severe muscle cramping and even death. It's certainly not a substance you would want in medication. 
Potter describes how her reignited sex life with ex-husband Alex has helped her lose 98 pounds. “I can't move much in bed, but I burn 500 calories a session –- it's great exercise just jiggling around," Potter told "Closer." Potter, who had been consuming 10,000 calories a day, hopes to reach her goal weight of 532 pounds with the help of Alex. The two have sex up to seven times each day. Alex, who weighs just 140 pounds, does most of the work in the bedroom.
Obesity has become a worldwide public health concern [1,2]. Based on recent US data, the prevalence of obesity is 37.7% in adults and 17.0% in children and adolescents, with no sign of a reduction in the foreseeable future [3–5]. Although many approaches can be used to achieve short-term weight loss, its maintenance remains a key challenge [6,7]. Meanwhile, given the same intervention strategies, apparent within-group variability in weight loss and weight regain has been demonstrated [7,8]. Although the exact reasons for the variability are largely unknown, accumulating evidence has suggested that certain environmental compounds may play an important role in weight gain and obesity development [9,10].
“Anytime you’re stressed, you probably go for food,” Dr. Seltzer says. (Have we met?!) That’s because cortisol, the stress hormone, stokes your appetite for sugary, fatty foods. No wonder it’s associated with higher body weight, according to a 2007 Obesity study that quantified chronic stress exposure by looking at cortisol concentrations in more than 2,000 adults’ hair.

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