In the early stage of obesity, the volume of fat cells became larger, and with the continuous increase of body weight, the number of fat cells began to increase. At this time, obesity is difficult to treat. The study found that the number of fat cells did not decrease after dieting or limiting energy intake to lose weight, so when the normal diet was restored, the weight returned to the state before losing weight. Generally, obesity in the following periods is difficult to cure.
Obese infants aged 12 to 18 months after birth;
-/kloc-obese people aged 0/2 to 16;
-Obese adults whose weight exceeds 60% of their ideal weight (or whose body mass index is greater than 40);
-Obese women who were obese during pregnancy and did not regain their postpartum weight;
Due to obesity in the above period, the number of adipocytes increased obviously, which made the treatment more difficult. But why are some people who eat the same diet fat and others not? Because the following factors are different.
Dietary factors
Dietary factors are the key factors of obesity. The root cause of obesity is that the intake of calories exceeds the consumption of calories, which is in line with the truth that "the disease enters from the mouth". So no matter what you eat, as long as the total calories exceed the body's needs, you will get fat. But why do some people get fat even if they don't eat much? At this time, it is necessary to consider the proportion of different varieties in the diet. Eating too much oil will promote the growth of adipose tissue, especially saturated fatty acids. Saturated fatty acids mainly come from animal fats, and generally edible vegetable oils also contain a lot of saturated fatty acids. "Overheating" in the cooking process will also oxidize a small amount of unsaturated fatty acids into saturated fatty acids. Eating too many calories is always related to eating too much fat, because the efficiency of carrying calories with the same amount of fat is much higher than that with the same amount of starch and protein, so "not eating too much" does not mean "not eating too many calories". In short, the improvement of living standards and eating habits are important reasons for obesity.
environmental factor
Environmental factors mainly refer to people's social environment, living habits and fashion. In the era of Yang Guifei, "Fat is beauty" naturally determines the lifestyle of people who pursue fashion. American lifestyle will make people fat. The diet and living habits of Coca-Cola or McDonald's in the United States determine the incidence of obesity in the United States by nearly 30%. If you drink sugary drinks and eat fast food at a meal, the calories you consume when you are full are much higher than when you eat normally. Therefore, the more "Americanized" the lifestyle, the higher the possibility of getting fat. Similarly, fierce social competition, great psychological pressure and anxiety have also changed people's lifestyles, but unfortunately, these changes often make people fat.
hereditary factor
Heredity is not only related to obesity, but also to emaciation. This inheritance is more related to the mother. If the mother is obese, the probability that the child is obese may be 75%. Similarly, if a mother is emaciated, then her child is 75% likely to be emaciated.
People with a genetic background of obesity or a tendency to suffer from obesity have more efficient metabolism. In other words, in times of famine, a small amount of diet can keep these people alive. From the genetic background, these people are more suitable to live in the famine era. It can also be said that long-term lack of diet has given these people this genetic feature. This is the truth of "survival of the fittest". These people have "thrifty genes". But when these people become rich in a short time, their diet is not only satisfied, but also their calories are far more than that. At this time, this "thrifty gene" allows these people to store as many calories as possible, so these people are more likely to gain weight. China's long history of poverty has enabled most people in China to acquire this "thrifty gene". Therefore, in the past 10 years, the rapid improvement of living standards has made obesity and obesity-related diseases (such as hypertension, diabetes, coronary heart disease, etc. An important reason that threatens people's health.
age
With the increase of age, the metabolic rate in the human body will decrease year by year, so the same diet and the same amount of exercise will not make you fat at the age of 20, but will make you fat at the age of 40. In addition, our physical activity momentum also decreases with the increase of age.
gender
Gender is a very important factor. The metabolic rate of men at rest is higher than that of women, so men need more calories to maintain their weight. In addition, the metabolic rate of middle-aged women after menopause also decreased significantly, so women began to gain weight after menopause. Moreover, there are differences between men and women in eating habits, food intake and exercise, so gender is also an important factor in determining obesity.
amount of exercise
People who exercise a lot eat more calories and are less likely to gain weight. But some people engage in large-scale sports intermittently, and may only exercise for a few hours a week or even a month. The result is not to control weight, but to increase appetite. So regular exercise will have a good effect.
weight
Heavy people need more calories to keep their weight than light people. For example, a person weighing 90kg needs 2500 kilocalories a day to maintain his weight. If he consumes less than 2500 kilocalories a day, he will lose weight. When his weight drops to 80kg, he only needs 2000 kilocalories a day to maintain his weight. If he still gives 2500 kilocalories a day, his weight will return to 90kg.