I began to have gray hair in junior high school, and it was already very serious when I graduated from senior three, so this is how I wrote my undergraduate thesis. A little conclusion, the details are as follows: 1, experimental background: First of all, an obvious reasoning: there is white hair, it must be because of the lack of melanin. As for why it is lacking? Because it is not born with white hair, but some hair turns white after growing up, it is inferred that the amount of melanin synthesis is reduced. (Melanin can't be obtained from food, so it can be used directly. Then why is the amount of synthesis small? Two reasons: 1, insufficient raw materials;

2. There are problems in the synthesis process. Insufficient raw materials? Melanin is nothing more than a kind of protein, and raw materials are definitely not a problem. Rule out. Is there a problem in the synthesis process? According to the data, the synthesis of melanin needs a catalyst-melanin enzyme, which is found in human body. Then infer whether it is difficult to synthesize melanin because of the lack of melanin enzyme, thus forming white hair. This needs to be verified by experiments. 2. Experimental theory: Melanase is also a large protein, which cannot be directly obtained from food. Look at its molecular formula and find that it contains copper. I checked some papers and found that trace elements can be deposited in the hair that grew at that time. In other words, whether a person lacks trace elements can be analyzed from his hair. Therefore, the purpose of the experiment is to determine and compare the contents of trace elements in the hair of bald people and normal people, and try to explain the causes of baldness from this angle.

3. Experiment &; Results: I cut part of my hair, some white and some black. (Don't choose white hair or black hair separately, assuming that the contents of trace elements in white hair and black hair that grow at the same time are equal). I chose black hair of the same weight from the barber shop. Samples are treated by the same procedures: ashing, dissolving, filtering and drying. Then the PIXE technique was used to determine nuclides, and it was found that the index of trace elements in my hair was much lower. Use low-tech relative measurement. 4, discussion I also know that my broken experiment can not explain the problem, because there is no control group, no statistical data is formed, and the interference of other factors such as individual differences is not ruled out at all. The main purpose of writing here is to provide such a possible explanation.

Personally, the lack of trace elements and vitamins should be the main reason for baldness. After eating vitamins and all-round nutrients for a period of time, the situation of gray hair did improve, but it never disappeared. I think white hair is also related to personal physique. If it is too much, you can have a physical examination and treatment.