Oat, also called wild wheat or brome, is the seed of millet oat in Gramineae.

The fat content of oat ranks first among all grains, which is 4 ~ 5 times that of rice and white flour. Its fat is mainly composed of single unsaturated fatty acid, linolenic acid and hypolinolenic acid, and only linolenic acid accounts for 35% ~ 52% of all unsaturated fatty acids. Oats also contain 8 kinds of amino acids and vitamin E needed by human body, and their content is also higher than that of rice and white flour. Oats also contain vitamins B 1, B2 and folic acid, as well as minerals and trace elements such as calcium, phosphorus, iron, zinc and manganese. Oats are not only nutritious, but also have high nutritional value, and have been listed as health food. Oats are sweet and warm, and can tonify deficiency and stop sweating. Modern research shows that linolenic acid contained in oats is the most important essential fatty acid for human body, which can maintain normal metabolic activities of human body, is also an essential component for synthesizing prostaglandin, and also plays an important role in maintaining human sexual function. Oats contain unsaturated fatty acids, fatty acids, soluble fibers and saponins, which can reduce the contents of cholesterol and triglycerides in blood, not only regulate fat and lose weight, but also help to lower blood sugar. Oats contain vitamins B 1, B2, vitamin E and folic acid, which can improve blood circulation, help to eliminate fatigue and be beneficial to the growth and development of the fetus. Oats are rich in cellulose, which has the function of moistening intestines and relaxing bowels, can help the elderly to prevent intestinal dryness and constipation, and has the function of preventing cerebrovascular diseases. Oats contain minerals and trace elements such as calcium, phosphorus, iron, zinc and manganese, which can prevent osteoporosis, promote wound healing and prevent anemia.

Barley belongs to the genus Hordeum. It is one of the oldest food crops in the world. Barley is widely distributed in China, and its cultivated area is second only to rice, wheat and corn, accounting for the fourth place in cereal crops.

Barley is divided into glume barley and naked barley according to whether the inner and outer glumes fit each other. Barley with glume shell, commonly known as barley, is also called hulled barley. When this barley is ripe, the peel secretes a sticky substance, which firmly adheres the inner and outer glumes to the caryopsis and cannot be separated when threshing. Highland barley is also called naked wheat, yuan wheat, rice wheat, highland barley and so on. When this barley is ripe, the caryopsis is separated from the inner and outer glumes, and the husk can be removed when harvesting and threshing. According to the different ear shapes, barley can be divided into three types, namely, six-rowed barley, four-rowed barley and two-rowed barley. Six-rowed barley has a regular hexagonal cross section, dense spike shape, small and neat grains and more protein. Six-rowed hulled barley germinates regularly and has high amylase activity, which is especially suitable for making malt. Six-rowed barley is mostly used as food. Four-rowed barley, the cross section of wheat ear is square, the ear shape is sparse, the grain is slightly larger but uneven, and the protein content is high. Four-ribbed skin is only suitable for feed because of irregular germination, and four-ribbed naked barley can also be used as food. Two-edged barley ears are flat, forming two corners. Two-rowed barley is mostly spikelet barley, with large and neat grains, thin skin, high starch content, low protein content and neat germination, which is the best raw material for brewing beer.

Barley can also be classified according to sowing date, that is, winter barley and spring barley. Winter barley is mainly concentrated in the Yangtze River valley, and spring barley is distributed in the northern cold region or agricultural and pastoral areas.

Whole wheat refers to processing food with whole wheat flour without removing bran and wheat germ.

Corn flakes are a kind of food processed from corn. It used to be the first breakfast cereal in industrial production. The word "slice" of cereal refers to a kind of cooked, crushed and dried corn, which is usually put in milk, juice or made into porridge.

Oatmeal is also divided into ordinary oatmeal and oatmeal. Oatmeal is made of oatmeal. Because of its simple production process and time saving, some kinds of oatmeal can be eaten as long as it is soaked, so it has been welcomed by many people.

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