In layman’s terms, vitamins are life-sustaining substances, a class of organic substances necessary for maintaining the body’s vital activities and important active substances for keeping the body healthy. The amount of vitamins in the body is small, but essential. Vitamins are natural chemicals found in food and cannot be produced by the body itself. As one of the seven essential nutrients, what is the role of each vitamin in the human body? What are the symptoms of vitamin deficiencies and what diseases are they likely to cause? How do you know which vitamins you are deficient in? In reality, there are not many people who are seriously deficient in vitamins, but there are many people who are trapped in invisible vitamin deficiencies. Once the lack of vitamins, what exactly will be the disease? 1, vitamin A deficiency : rough skin, itching, nails appear profound white lines, dry hair, memory loss, mood irritability and insomnia, dry conjunctiva of the eye, urinary tract stones. Should eat more beef liver, eggs, red and yellow vegetables, fruits and cod liver oil. 2, vitamin D deficiency: osteochondrosis, children suffering from chondromalacia. Should eat more fish and eggs, more sunshine. 3, vitamin B1 deficiency: allergic to sound, allergic reaction to audio, intermittent soreness in the lower legs, suffer from foot disease, neurodermatitis, etc.. Should eat more beans, cereals, hard fruits, fruits, milk and green leafy vegetables. 4.Insufficient vitamin B2: inflammation of the corners of the mouth, various skin diseases, such as dermatitis, scrotal inflammation, etc., burning sensation in the limbs of the hands, over-sensitive reaction to light, etc. More animal liver, milk, eggs, beans and green vegetables should be consumed. 5, vitamin B6 deficiency: posterior heavy tongue, puffy lips, tongue pain, lip pain, scalp special much, dry oral mucosa. Should eat more yeast. 6.Vitamin B12 deficiency: action is easy to lose balance, the body will have intermittent indeterminate position pain, fingers have tingling sensation, should eat more animal liver and yeast. 7, vitamin C deficiency: no overwork, rapid environmental changes or other organic diseases and other objective reasons, but often feel fatigue, often easy to catch a cold, cough, resistance to decline, gums often bleeding, wounds are difficult to heal, deep marks on the tongue, etc.. Should eat more citrus, orange, grapefruit, red dates, sour dates, etc. 8, vitamin PP deficiency: tongue inflammation, dermatitis, loss of appetite, indigestion, vomiting, dizziness, memory loss. You should eat more coarse grains, green leafy vegetables, animal liver, peanuts, protein, etc. The body’s external organs will also send out signals of vitamin deficiency: 1, oral signals: If you find that the corners of the mouth red, dry and cracked for a long time, and pain in the lips and tongue, you are likely to suffer from stomatitis, stomatitis is mostly caused by a lack of iron and vitamin B2 (riboflavin) and vitamin B6. Supplementary methods are to eat more spinach and other green leafy vegetables, often eat pork, beef, liver, beans, etc., can also take vitamin B nutrition pills under the guidance of a doctor. 2, lip signal: lip cracking, peeling, lip line blurred, is a sign of lip disease, indicating that you lack of vitamin B2 and vitamin C. Supplementation is to eat more vegetables, citrus, tomatoes, melons, potatoes, etc., or under the guidance of doctors to take vitamin B nutrition pills and vitamin C tablets. 3, tongue signal: If you find yellow or white on both sides of the tongue, it means you lack folic acid and iron. Lack of this substance will hinder the production of red blood cells, thus causing tongue inflammation, anemia, gastrointestinal dysfunction and poor growth and development. Supplementary methods are to eat more animal liver, spinach, black bread or take vitamin B nutrition pills containing folic acid ingredients under the guidance of a doctor. 4, nose signal : If the sides of the nose greasy light red, it means that your body is lack of zinc. Zinc deficiency can cause loss of appetite and metabolic disorders. However, most foods contain zinc, and zinc deficiency can be corrected if you do not eat in a partial manner, or take multivitamin pills containing zinc under the guidance of your doctor. 5. Nail signals: white spots on the nails indicate zinc deficiency; nails that break easily indicate iron deficiency. Zinc deficiency and iron deficiency may sometimes occur at the same time. Supplementation can be done by eating more spinach, animal liver, pork, beef and mutton, and taking multivitamin pills containing zinc under the guidance of a doctor. 6, hair signal : hair loss, hair pulling out without pain, hair easy to tangle and curl, indicating that you lack of vitamin C and iron. And lighter and lighter hair color is a signal of low vitamin B12. The way to regulate it is to eat more dairy foods, liver, fish and legumes or supplement with vitamin B nutritional pills. If you notice any of these phenomena, especially in middle-aged and elderly people, it is best to consult a doctor and not to take vitamin pills indiscriminately, as it will be harmful to your body. It is recommended that the best way to supplement vitamins is through natural foods first, not chemically synthesized drugs.