around us, there is no lack of every day in the inspirational weight loss of all age groups, that the world really have so much fat? Or let the latest data to answer our inner confusion it According to the latest statistics from the World Health Organization (WHO), about 1.9 billion adults worldwide are overweight or obese. In other words, four out of 10 adults are overweight, at least one person is obese. “China residents nutrition and chronic disease status report (2015)” also pointed out that China’s urban and rural residents have changed the diet, overweight and obesity problems highlighted, China is currently the world’s most fat country. Obesity really just shape the change, it is not true. The World Cancer Research Foundation (WCRF), “Food, Nutrition, Physical Exercise and Cancer Prevention,” the report shows that there is ample evidence that obesity is leading to esophageal cancer, pancreatic cancer, colorectal cancer, postmenopausal breast cancer, intrauterine Membrane cancer, kidney cancer risk factors. Obesity (obesity) refers to the body fat accumulation and (or) abnormal distribution, weight gain, is a multi-factor chronic metabolic diseases. Obesity in accordance with the causes can be divided into three categories, ① hereditary obesity: mainly refers to genetic material (chromosome, DNA) changes caused by obesity, this obesity is relatively rare. ② secondary obesity: mainly due to changes in the hypothalamus – pituitary – adrenal axis, endocrine disorders or other diseases, trauma caused by endocrine disorders caused by obesity. ③ simple obesity: mainly refers to the exclusion of hereditary obesity, metabolic diseases, trauma or other diseases caused by secondary, pathological obesity, and simply due to excess nutrients caused by excessive accumulation of systemic fat, but also often For the family gathering tendency. Obesity common judgments, mainly in the following categories: (1) BMI (body mass index), that is, body mass index (also known as body mass index). BMI is a height and weight, calculated whether the normal, overweight and fat with the value. There are several ways to detect whether there is obesity, the international common indicator is BMI value. BMI value of the algorithm: weight (kg) / height (m) of the square, such as a person’s height 1.7 meters, weight 65 kg, then BMI = 65 / (1.7 * 1.7) = 22.5. Usually China’s adult BMI standard: 18.5 ~ 23.9kg / m2 for the normal weight, 24.0 ~ 27.9kg / m2 for overweight,> 28kg / m2 for obesity,> 40kg / m2 for the sick obesity. (2) waist circumference (waistcircumference). Waist circumference is a comprehensive indicator of total fat and fat distribution, WHO recommended measurement method is: the measured person standing, feet separated 25 to 30 cm, evenly distributed weight. The measurement position was at the midpoint of the horizontal anterior superior iliac crest and the 12th rib edge. The measuring ruler close to the soft tissue, but can not be pressed, the measured value is accurate to 0.1 cm. China’s indicators are male waist should be less than 85 cm, women should be less than 80 cm, more than this range was obese. (3) waist-to-hip ratio (waist-to-hip ratio). Asians standard is male should be less than 0.9, women should be less than 0.8, if it is over obesity. (4) standard weight (ideal weight). The standard weight is height (cm) -105 = kg, if more than 10%, then overweight; if more than 20%, then obese; if more than 20-30%, compared with mild obesity; if more than 30-40 %, For moderate obesity; if more than 50% for moderate obesity. Weight in the standard plus or minus 10% are normal. Because its “true value” is difficult to estimate, it is now less used. (5) body fat rate (body fatrate). More than 20% of men are mildly obese, more than 25% are moderate obesity, more than 30% are severe obesity; women over 30% are mildly obese, more than 35% are moderately obese and more than 40% are severe obese. (6) skin dull thickness (Skinfold thickness). The skinfold thickness of the subscapular and upper arm triceps muscles was measured by the skinfold thickness gauge (skin fold calipers), and the two were added to the skinfold thickness. In addition can also measure the iliac crest and umbilical 1cm at the skin fold thickness. Skinfold thickness is generally not alone as a criterion for determining obesity, but with body weight combined to determine. In 1997, the World Health Organization (WHO) first defined obesity as a disease. In 2000, the US Food and Drug Administration (FDA) admitted that obesity is a disease. In recent years, more and more studies have been based on a large number of epidemiological data, and it is clear that obesity is a disease. More importantly, obesity affects the normal physiological function of the human body, threatening human health, and at least 2.8 million deaths per year can be attributed to overweight or obesity. Cancer is the second leading cause of death in the world. One third of cancer deaths stem from five behaviors and dietary risk factors: high body mass index, low intake of fruits and vegetables, lack of exercise, smoking and drinking. February 28, 2017, “British Medical Journal” published a report online that obesity can increase, including breast cancer, ovarian cancer, endometrial cancer and other 11 kinds of cancer risk. The study presented a meta-analysis of 204 articles that included obesity, weight gain, waist-to-hip ratio versus 36 types of cancer. The results showed that when the body mass index exceeded, esophageal, bone marrow, biliary system, pancreas and kidney cancer risk increased, male colon cancer, rectal cancer, premenopausal women, the incidence of endometrial cancer also increased. The study found that, for men, the body mass index for each additional 5kg / m2, rectal cancer, biliary cancer risk increased by 9% and 56%. For women, the risk of breast cancer is increased by 11% for each 5 kg / m2 increase in body mass index; the risk of endometrial cancer is increased by 21% for every 0.1% increase in waist-to-hip ratio. In April 2016, the “Lancet” published a study report to 40 yearsThe statistics reveal the global obesity problem. The global obesity population rose from 185 million in 1975 to 641 million in 2014, far exceeding the overweight. Among them, China and the United States is the world’s largest number of obese countries. In January 2017, Forbes published an article that the number of obese people in China has caught up with the United States, which undoubtedly greatly increased the country’s economic and medical burden. The increase in obese population in China is mainly related to the change of dietary structure. As the consumption of cereals in the dietary structure shows a steady decline, the fat intake is increasing, especially the intake of pork is increasing, and the physical activity Lack of reasons, the problem of overweight and obesity is more prominent. These research data are all reminded: for those overweight or obese people, the weight control within a reasonable range is not just to bring you the appearance of the aesthetic and action on the comfort, may be able to reduce the risk of cancer, why Not for it? In fact, in the final analysis on the sentence: you, the weight loss!