Hello everyone, I am Gao, sharing knowledge and growing together. The last video talked about the general lack of B vitamins in modern people. In fact, B vitamins can be synthesized in our body, and beneficial bacteria in the intestine can also synthesize B vitamins. This may be a more important source of B vitamins than other ways, but it is difficult to measure the amount of B vitamins produced in this way. If the beneficial bacteria in the intestine are destroyed, B vitamins cannot be synthesized. It is very important for our health to protect the beneficial bacteria in our body and let them grow healthily. Every cell in the human body needs the same amount of B vitamins. Because all cells need the same B vitamins. Therefore, before an order is placed, it may cause serious harm to the body before it is noticed. This kind of injury is absolutely real. It causes not only the pathological changes of an organ in your body, or vision problems, but the degeneration of your whole body. It is difficult for an adult to realize this overall disease of the body. But for teenagers, severe developmental delay is easy to be noticed. When the deficiency of B vitamins reaches a very serious level and cells are also damaged, the heart often shows the symptoms of deficiency first. That's all for today's video. I hope it helps you. The next video will share why our bodies can't lack B vitamins. See you next time.