In recent years, the vegetarian diet has gradually been accepted by the public. Especially the plump women, even take vegetarianism as a habit, hoping to achieve the goal of losing weight. There is no denying that eating more fiber-rich foods such as vegetarian food, vegetables and fruits is really helpful to lose weight. However, recent medical research on vegetarianism has confirmed that women who are vegetarian often do not eat rice, which will not only make them fatter, but also get sick. Refusing to eat meat will lead to insufficient intake of protein in animals. Even if plant proteins such as beans are supplemented, their absorption and utilization are far less than those of animal proteins. When protein, a vegan, is under-consumed, protein, carbohydrate and fat in human body will be out of balance, and immunity, memory loss, anemia and indigestion will follow one after another. In addition, vitamins and nicotinic acid are also lacking due to the little intake and absorption of fat-soluble vitamins, and diarrhea will come, in addition, it will be easy to feel dull and dermatitis. Moreover, fruits, vegetables, soybeans and grains are rich in dietary fiber, which can promote gastrointestinal digestion on the one hand, and promote intestinal peristalsis and reduce the time for intestinal contents to pass through the intestine on the other hand, thus shortening the interval of defecation. Excessive dietary fiber will accelerate the discharge of mineral nutrients in the gastrointestinal tract, resulting in the deficiency that mineral nutrients in the body have been lost without absorption. Most importantly, many women just eat vegetables because they think that they can lose weight as long as they eat vegetables. In fact, when they eat vegetables, they can't lose weight. That's because vegetables are easy to absorb oil, but they are more likely to eat more oil and get fatter. There are about 9 calories in one gram of oil; In a gram of protein, there are about 4 calories; In contrast, one gram of rice has only four calories. Therefore, only eating vegetables and not eating will lead to more oil and protein in the diet, and the calorie will increase sharply, but it will get fat. If you don't eat meat for a long time, your immunity will decline. In our diet, all kinds of trace elements that are beneficial to the human body are essential. No matter which element is missing, it means potential danger to the body! Nutrition is the material basis of human health and longevity. The quality and quantity of nutrition directly affect human health, disease resistance and life span. The human body's demand for dietary nutrition is not only comprehensive in variety, but also to maintain a balanced diet. Meat food contains 8 kinds of essential amino acids, which are more suitable for human digestion and absorption. And the content of lysine is higher, which is more beneficial to supplement the deficiency of lysine in plant protein. Not eating animal protein for a long time will lead to decreased immunity. However, a long-term vegan diet will definitely make the human body lack vitamin B12, calcium, iron, zinc and other trace elements, so that it will have many adverse effects on the human body. Being cautious about vegetarianism will lead to a decline in fertility. Among the many studies on the effects of vegetarianism on female fertility, the conclusion of Masbaolan College in Munich, Germany is the most noticeable. Professor Karl Burke of the college divided the healthy girls who participated in the experiment into two groups, one of which was vegetarian except for a small amount of cheese and milk. The other group ate normal food. After the 6-week weight-loss program ended, the researchers found that 78% of the women who lost weight on a vegetarian diet had a physiological phenomenon of stopping ovulation, and almost all of them had shorter menstrual cycles than normal. However, in the normal diet group, 67% of women ovulate normally, and the menstrual cycle has not changed significantly. Professor Karbaoke analyzed that under the condition that the weight of the two groups of subjects decreased by the same extent and their exercise was the same, the reason why the women in the vegetarian group stopped ovulation was related to the fact that the food they ate contained too little protein, which led to abnormal hormone secretion and menstrual cycle disorder. In this way, she concluded that vegetarianism will lead to abnormal reproductive function and even seriously affect reproductive ability. Professor Karbak pointed out that if women don't want their fertility to be affected, they must think twice before going on a vegetarian diet, especially for women over the age of 30, whose fertility has declined, so they should be more cautious. Vegetarians pay attention to nutrition collocation for many years. Scientific research shows that although vegetarian habits have irrefutable benefits in resisting cardiovascular diseases and preventing obesity and other diseases, because people are living in a high-speed modern social environment, vegetarians are often "ashamed" in front of jobs that require a lot of physical energy. Therefore, vegetarians need to pay more attention to nutrition collocation.