Cancer can be caused by many factors, such as environmental pollution and hereditary factor. In fact, it can also be caused by the diet. A healthy and balanced diet can provide essential nutrients for you to resist cancer. However, if you maintain an unhealthy diet in your daily life, you can not get beneficial nutrients for your body. The inadequate supplementation of nutrients can seriously cause cancer. 

A lack of vitamin D can induce breast cancer. According to the medical research, the content of vitamin D in the bodies of the patients with breast cancer is always low. Therefore, women should often eat the foods like fish, beef and liver to absorb vitamin D. They can frequently bask in the sun so as to accelerate the synthesis of vitamin D in their bodies.

A lack of protein can induce gastric cancer. It is necessary for you to absorb enough high-quality protein to prevent the appearance of gastric cancer. The foods like soy bean products and lean meat can provide a high content of protein for you. Apart from the inadequate supplementation of protein, the excessive intake of cured foods can also increase the risks of getting gastric cancer. You should decrease the intake of salt and increase the intake of fresh fruits and vegetables to prevent the disease.

A lack of dietary fibers can cause colon cancer. Nowadays, people always absorb much high fat and high protein. High fat and high protein can be decomposed in the human body to produce carcinogenic substances. If people can not absorb dietary fibers in time, these carcinogenic substances can be accumulated in the mucous membrane of colon for a long time to induce cancer. Therefore, you should often eat the foods like soy beans containing abundant dietary fibers.

A lack of beta-carotene can induce lung cancer. Nowadays, the disease rate of lung cancer is very high. Both smoking and the inadequate supplementation of beta-carotene can cause the disease. Therefore, the smokers and the patients with phthisis should supplement adequate beta-carotene for themselves. The foods like spinach and carrots contain a high content of beta-carotene. They can often eat such foods in their daily life.

A lack of vitamins can cause many uncomfortable symptoms. For example, the inadequate supplementation of vitamin A can seriously cause nyctalopia and insomnia and affect the memory. The lack of vitamin B2 can cause angular stomatitis. Therefore, you should supplement adequate vitamins for yourself to prevent uncomfortable symptoms.