The black part of walnut meat is spoiled walnut meat, which is bitter and not nutritious to eat, but will be detrimental to your health. If the color of walnut seeds is not white yet, you can eat them when there is no mold or hawthorn or flavor. It is best not to eat walnuts when they have turned black or yellow. Blackening or mold on the outside of fresh walnuts has no effect on the nuts and makes them tastier. Remember, fresh walnuts should be dried in the sun, fresh walnuts are white, when dried the walnuts will turn black, and there are some walnuts that are essentially black. It's the oleaginous kind of walnut. It is black when it is moldy, black when it is moldy, and it is best not to eat it. Walnuts are also known as the walnut family of plants, walnut eggs are rich in nutrients, containing 15 to 20 grams of protein, 60 to 70 grams of fat, 10 grams of carbohydrates, essential calcium, phosphorus, iron and a variety of trace elements, as well as minerals, carotene, riboflavin and a variety of vitamins.

Walnuts with black skin soaked in boiling water for about 5 minutes, cooled in cold water, rub the skin or directly with a toothpick to pick the skin peeling, you can use the pulp inside. Pay attention to whether there is mold in the walnut eggs, moldy must not eat. Aged walnuts, walnut appearance changes or small or large, but when people inside from white to yellow, it is a manifestation of corruption. At this time, walnuts gradually lost the original color and aroma, the color is getting darker and darker. Taste may have "hara flavor", this walnut kernel has lost its value, serious, and even carcinogenic aflatoxin, please do not eat.

Walnuts in the tree when growing, pests and diseases caused by walnuts turned black. For example, walnut black (walnut or room) danger, solarization, severe black spot disease, Yinwen disease and other damage caused. Such walnuts are certainly not worth eating. Walnuts in the ripening season rains smoke, trees walnut seeds within the seed coat darkening is mainly a case of darkening of the walnut shell color. The inner seed coat of walnuts is dark, brown close to black or with light or heavy fungus. But the walnut eggs are normal white color. These walnuts are usually edible and have no effect on flavor or nutrition. False rigor mortis, provide nutrition: animal experiments have shown that mixed fat foods containing walnut oil lead to weight gain, increased serum albumin, and a slow rise in blood cholesterol levels, making walnuts a rare tonic for high-fat substances.

Peach kernels have a direct antibacterial and anti-inflammatory effect. Clinical reports say that walnut tar zinc oxide paste made from mashed walnut seeds is up to 100% efficient in treating dermatitis and eczema. Walnut seeds are rich in oil, which helps to moisturize the skin and keep the body alive. Experiments have proved that the active ingredients of walnut have inhibitory effect on S37 tumor in mice. Walnut technology has a certain inhibitory effect on a variety of tumors such as esophageal cancer, stomach cancer, nasopharyngeal cancer, lung cancer, thyroid cancer, lymphosarcoma and so on. In addition, walnuts also have bouts of cancer patients, with the effect of raising white blood cells and protecting the liver. Walnut eggs contain a large amount of protein and unsaturated fatty acids required for human nutrition, these components are important substances in the metabolism of brain tissue cells, which can cultivate brain cells and improve brain function. The phospholipids of walnuts have a good health effect on the brain nerves.