The nail concave changes refer to the appearance of horizontal and vertical lines and spots on the nails. According to Chinese medicine, this change in the nail is closely related to the low function of the body’s tissues and organs, the destruction of tissue structure, atrophy and other pathological changes. So, what foods are contraindicated for patients with concave nails? Here are the foods that concave nail patients should not eat: concave nail patients should not eat wet food; avoid eating cold food; avoid eating thick and heavy food. 1, salty fish: the taste is too thick, due to excessive salt, can aggravate the accumulation of body moisture, is not conducive to the treatment of gray nails. It is advisable to eat confidence freshwater fish. 2, cuttlefish: has certain hairy properties, not conducive to the removal of body dampness. It is appropriate to eat fresh fish. 3, seafood: the taste are thick, for fungal infectious diseases, are unfavorable, and induce allergies aggravate the possibility of itching. Appropriate to eat freshwater fish.