Therapeutic agent for inflammatory bowel disease and tnf-alpha production inhibitor

10:

• A method for treating and/or preventing an inflammatory bowel disease, which comprises administering one or more amino acids selected from the group consisting of lysine, histidine, phenylalanine, methionine, tryptophan, glutamine, glycine, cysteine, cystine, and threonine to a subject in need thereof in an amount of 0.1 to 4000 mg/kg per day.

11:

• The method of claim 10, which comprises administering one or more amino acids selected from the group consisting of lysine, histidine, phenylalanine, tryptophan, and glutamine to said subject.

12:

• The method of claim 10, which comprises administering tryptophan to said subject.

13:

• The method of claim 12, which further comprises administering one or more amino acids selected from the group consisting of lysine, histidine, phenylalanine, and glutamine to said subject.

14:

• The method of claim 10, wherein said inflammatory bowel disease is Crohn's disease.

15:

• The method of claim 10, wherein said inflammatory bowel disease is ulcerative colitis.

16:

• A method for treating and/or preventing an inflammatory bowel disease, which comprises administering 0.5 to 2% by weight of tryptophan, 3 to 9% by weight of lysine, 1.5 to 5% by weight of histidine, 4 to 10% by weight of phenylalanine, and 9 to 23% by weight of glutamine, to a subject in need thereof in an amount of 0.1 to 4000 mg/kg per day.

17:

• The method of claim 16, wherein said inflammatory bowel disease is Crohn's disease.

18:

• The method of claim 16, wherein said inflammatory bowel disease is ulcerative colitis.

19:

• A method for inhibiting TNF-α production, which comprises administering one or more amino acids selected from the group consisting of histidine, phenylalanine, and tryptophan, to a subject in need thereof in an amount of 0.1 to 4000 mg/kg per day.

20:

• A method for inhibiting TNF-α production, which comprises administering 0.5 to 2% by weight of tryptophan, 3 to 9% by weight of lysine, 1.5 to 5% by weight of histidine, 4 to 10% by weight of phenylalanine, and 9 to 23% by weight of glutamine, to a subject in need thereof in an amount of 0.1 to 4000 mg/kg per day.