In addition to heat, the summer climate is also characterized by "wet", that is, the humidity of the external environment is high. Like temperature, humidity is also an important factor affecting human comfort. Traditional Chinese medicine believes that dampness is yin evil, which is easy to block the movement of qi and affect the movement of qi in the body. People often have symptoms such as general fatigue, loss of appetite, sweating and drowsiness. Hot climate and excessive sweating can easily lead to disorder of water and electrolyte metabolism. Yam is not greasy, fragrant but not dry. Eating in summer can not only effectively relieve all kinds of discomfort in summer, but also strengthen the spleen and moisten the lungs, nourish the stomach and tonify the kidney, which plays a very good health care role.

Chinese medicine believes that yam is sweet in taste, flat in nature, enters the spleen, lungs and kidneys, and has the functions of invigorating spleen and qi, tonifying lung and kidney and stopping leukorrhagia. Shennong's Herbal Classic, the earliest existing pharmaceutical monograph in China, lists it as the top product of "long-term food tonic, dispelling cold, promoting granulation, improving eyesight and hearing". "Compendium of Materia Medica" records "benefiting kidney qi, strengthening spleen and stomach, stopping diarrhea, resolving phlegm and promoting fluid production. Moisturize fur "; "Drug Meaning" states that "reinforcing middle jiao and strengthening tendons".

Yam has the characteristics of "invigorating qi without stagnation, nourishing yin without greasy", and is used to treat diarrhea due to spleen deficiency, vomiting due to stomach qi, cough and asthma due to lung deficiency, leukorrhagia due to kidney deficiency, thirst quenching, obesity and other diseases, with good curative effect.

In addition, there are many nourishing prescriptions, such as Liuwei Dihuang Pill, Qiju Dihuang Pill, Guipi Decoction, Shen Ling Baizhu Powder and other traditional Chinese medicines all contain yam ingredients.

Bazhen cake, a life-prolonging food handed down from the Ming Dynasty, is made of eight Chinese medicines, including yam, hawthorn and malt, and rice flour. It is used to treat spleen and stomach weakness, loss of appetite, abdominal distension, sallow and emaciated, and diarrhea with remarkable effect.

Nutritional analysis shows that yam is rich in starch, glycoprotein, amino acids, mucus, choline, vitamins and other nutrients. The digestive enzymes contained in yam can promote the decomposition of protein and starch, which is beneficial to the digestion and absorption of food. Dehydroepiandrosterone contained in Chinese yam has a special health care effect on human body, has the function of preventing arteriosclerosis and obesity, and can prevent connective tissue atrophy of organs such as lung and kidney, and prevent the occurrence of collagen diseases.

Need to be reminded that the starch content in yam is high, and it is best to eat less if the chest and abdomen are full, the stool is dry and constipation; People who are hot and easy to get angry should eat carefully.

People with diabetes should not eat too much yam at a time, and should appropriately reduce the amount of staple food when eating a large amount. Yam is a kind of rhizome food with high starch content, and overeating will increase blood sugar.

Patients with peptic ulcer and liver cirrhosis should choose cooking methods such as steaming and stewing, and avoid frying and vinegar. When people with poor gastrointestinal tract eat yam, do not take alkaline drugs such as baking soda tablets at the same time, so as not to make amylase in yam ineffective.

Dioscin in yam can synthesize hormones, such as testosterone and estrogen, so it is not suitable for male patients with prostate cancer and female patients with breast cancer.

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