The researchers used the body mass index (BMI) as a measure and found that when the BMI was between 22.6 and 27.4, the risk of death was the lowest. Once above or below this range, the risk of death from cancer, cardiovascular disease and other diseases will increase. The normal body mass index range should be between 18.5-24. Does this mean people are still fatter?
As soon as this news came out, it immediately jumped into the list of hot topics in Weibo. After reading it, netizens expressed "good relief". But should we really be fatter?
Slightly fat and long life
Find out what chubby is first.
In fact, it may be healthier to be fat. This is not the first time. Reporters search online, and there are many similar statements.
For example, researchers from Oxford University in the United Kingdom once wrote on the website of the authoritative medical journal The Lancet that through the investigation and analysis of nearly 6.5438+million people in Europe and North America, it was found that people with body mass index between the ages of 23 and 24 lived the longest.
Scientists at the Centers for Disease Control and Prevention in the United States have pointed out through case studies of nearly 3 million people around the world that both severe obesity and common obesity will increase the risk of premature death; But if you are only "slightly fat", the risk of premature death is 6% lower than that of people with normal weight.
For these research results, Li Yong, a nutrition expert in Jiangsu Provincial Hospital, said, "First of all, we should make clear what kind of concept chubby is."
Li Yong told reporters that the body mass index (BMI) used in these research results is a standard often used to measure whether the weight exceeds the standard. Its calculation method is: weight unit: kg ÷ (height × height) unit: meter. For example, a person has a height of 1.5m, a weight of 50kg, a body mass index of 50( 1.5× 1.5) and a body mass index of 22.22.
"According to the current general standards of China people, if a person's body mass index is ≥ 24, we will consider him overweight; Body mass index ≥28 is obesity. But in medicine, there is no such thing as' slightly fat'. " Li Yong analyzed that from these reports, most of the research results still tend to be so-called "slightly fat", which belongs to the "upper limit of normal weight range", and some studies include "overweight" bodies, but rarely include "obese" bodies.
"I don't know if you have observed that many times we think that people who are' a little fat' are actually normal in weight; On the contrary, we think that people who are just fine and slim are actually too thin. " Li Yong analyzed that this may be related to our long-standing aesthetic orientation of "thinness is beauty". Therefore, in this case, people who look slightly fat but are actually normal are definitely better than those who are "too thin".
When the body mass index is within the normal range, medical experts also believe that some people who tend to be within the upper limit may be in better health.
Ran Zhuoying, Department of Endocrinology, Nanjing Hospital of Traditional Chinese Medicine, said that taking diabetes as an example, when a person's body mass index exceeds 24, his risk of diabetes will increase significantly; When his body mass index exceeds 28, the risk is higher. When the body mass index of two people is also between 18.5-24.9, as long as there are no other risk factors such as family history, their risk of diabetes will not be too significant. But at this time, people who are close to the upper limit should be in better condition than those who are underweight in terms of nutrition reserve, energy reserve and stress reserve.
"Taking women as an example, proper body fat is still very important." Jean Zhuo Ying said that fat contains steroids, and steroids are the raw materials for the formation of estrogen. If there is too little fat, women's estrogen level and even the whole endocrine level will have problems. If the estrogen level is low, then girls may have menstrual disorder, amenorrhea and even infertility, and at the same time, there may be a series of metabolic problems such as bone loss and osteoporosis.
Li Yong also told reporters that a certain proportion of body fat can improve a person's cold resistance and disease resistance, while people with low body fat may have poor frost resistance and poor physique. In addition, if we suddenly encounter some major diseases and injuries, we will have enough energy reserves in our bodies, which will make it easier for us to survive the blows of diseases, injuries and operations and recover faster, and these may be the reasons why "mildly obese people live longer".
However, when the body mass index exceeds 24 and the person concerned is overweight, although some studies show that the life span of the person concerned may be extended, more studies clearly tell us that the risk of overweight people suffering from various diseases is greatly increased. Therefore, two experts believe that it is not good to be truly overweight in the case of balance of interests, and "normal obesity" will be more ideal.
Conclusion: The normal body mass index of China people is between 18.5-23.9. As long as it is within this range, it may be better to live in the "upper half".
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True fat and fake fat
"True muscle and false chubby" is the most ideal
In addition to putting forward the view that "normal obesity may be healthier than normal thinness", Li Yong also reminded people that they must pay attention to what type of "micro-obesity" they are.
"From the clinical situation, although the body mass index can explain many problems, it is not accurate enough to measure it only by the body mass index." Li Yong told reporters that through the test of body composition, it was found that although some people have a high body mass index or even overweight, they belong to the type of "true muscle pseudo chubby" and their health status is generally the best; On the contrary, some people have normal body mass index or even thin, but they are "really fat and fake thin" with less muscle and more fat, so they have as many health problems.
"In both cases, the former is more common in athletes or some people who have long-term exercise habits. Because they have high exercise intensity, low body fat, high muscle ratio and heavy muscles themselves. Therefore, although their body mass index is high, their health is very good. " Li Wei explained.
On the contrary, the latter situation is more common in women, especially those who have the habit of dieting and losing weight. Although their body mass index is low, they have less muscle and more fat, especially visceral fat. They can't enjoy the real "thin treatment" and will suffer from various "obesity diseases".
Too fat and too thin
In fact, they are all worried.
■ Fat people's troubles
1, various metabolic and circulatory diseases
Including hypertension, diabetes, hyperlipidemia and other metabolic syndromes, as well as coronary heart disease, cerebral infarction and other related circulatory diseases.
2. Tumor
Pancreatic cancer, colorectal cancer, uterine cancer, renal cancer and breast cancer are all closely related to fat people, especially "fat beauty" is more prone to gynecological tumors.
3. Bone and joint diseases
Compared with thin people, fat people often have knee problems earlier and suffer from osteoarthritis.
4. mental illness
Obesity will affect personal image, bring some negative effects on personal job hunting and love, and even bring some psychological and emotional obstacles in severe cases.
■ The enemy of the thin man
1, menstrual disorder and even infertility
Due to excessive weight loss, many women will have menstrual disorders, amenorrhea and even premature ovarian failure, and they will be infertile for life.
2. Diseases of digestive system
An unscientific diet will do great harm to the digestive system. In addition, too thin will lead to abdominal wall relaxation, abdominal muscle weakness, easy to cause gastroptosis.
3. Fatty liver and heart disease
Some women who are too thin may suffer from mitral valve prolapse syndrome; In addition, excessive dieters are prone to fat ectopic deposition, and the result is fatty liver.
4. Low immunity