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If you have a gastrectomy for cancer or obesity …



Problems in Absorption of Meat and Dairy Products
The risk of Alzheimer's dementia is up to 2.7x ↑
0.5 times more vitamin B12

If you have a gastrectomy for cancer or obesity ...

Vegetarians, gastric cancer, obesity, metabolic diseases, if the stomach is partially or completely removed, vitamin B12 deficiency is likely to occur. If your body lacks vitamin B12 to make red blood cells, nerves, and DNA, nervous system disorders such as anemia, abnormal feelings and numbness in hands, feet, and feet, disturbances in walking (balance and balance disorders), inflammation of the tongue, disorders cognitive, forgetful, can cause depression and delusions.

If you have a nutrient absorption disorder, such as Crohn's disease, the amount of gastric acid secretion to help the absorption of vitamin B12 is not enough because of long-term antacids or aging.

If this is the case, you might want to continue taking or injecting vitamin B12 supplements. If you cut your stomach or have problems with your digestive function, the intrinsic factor that helps absorb vitamin B12 in meat, eggs, and dairy products will be lost. 47% of dementia patients lack vitamin B12.

In recent years, studies have shown that the risk of developing Alzheimer's dementia is up to 2.7 times higher than in the same age group among parents aged 50 and older whose stomach is severed. On the other hand, even if the stomach is removed, the risk of developing Alzheimer's dementia is only 0.5 times higher than the general population if vitamin B12 supplements continue to be taken and injected.


Shin Dong-wook, professor of family medicine at Samsung Medical Center, and Dr. Yoon-Jin Choi from Seoul National University Medical University, had around 64,000 gastric cancer patients aged 50 years or older who received gastrectomy in 2007 ~ 2012 using large data on health insurance. The average age of 5.6 years is around 20,300 people in the same age group. The average age was 63.2 years, and they had no other cancers, no history of dementia, Parkinson's disease or stroke.

The risk of developing Alzheimer's dementia in all gastric resection groups was 39% higher (30% in all dementia) than in the control group. The risk of developing dementia is 1.96 times and 2.66 times higher than the general population, respectively, when vitamin B12 is not replenished after all of the above resections, or when filling is stopped within 3 years after surgery. On the other hand, the risk of developing dementia in the gastric resection group, which is continually supplemented with vitamin B12, is 0.71 times that of the general population (0.5 times in Alzheimer's dementia).

Dr. Choi said, "Three years after all of the above resections, vitamin B12 deficiency begins to become clearer, and if you don't add it, you must be careful to live with the factors that cause dementia." Professor Shin said, "Without the stomach, it's easy to lack many nutrients like vitamin B12." Vitamin B12 requires regular observation and supplementation to prevent dementia.

On the other hand, unlike Alzheimer's dementia, the risk of vascular dementia is 23% lower in the total ablation group (14% in the partial ablation group). This is because the gastric resection group reduces the amount of food and the ability to absorb nutrients, reduce visceral fat, and increase metabolic diseases that indicate vascular dementia such as hypertension, hyperlipidemia, and diabetes.

This finding was published in the American Journal of Oncology. By Im Woong-jae, staff reporter jaelim@sedaily.com


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