Representative spectra of 1H NMR from UAP and control groups. The different metabolites are as follows: 1-MH, 1-methylhistidine; Ace, acetic acid; Act, acetone; Cit, citric acid; Cr, creatinine; DMA, dimethylamine; EA, ethanol amine; Eth, ethanol; For, formic acid; Glc, glucose; Glu, glutamic acid; Gly, glycine; G, glycerinum; GPC, glycerophosphoryl choline; HDL, high-density lipoprotein; HX, hypoxanthine; IB, isobutyrate; Ile, isoleucine; L1, LDL, CH3-(CH2)n-; L2, VLDL, CH3-(CH2)n-; L4, VLDL, CH3-(CH2)n-; L5, VLDL, -CH2-CH2-C=O; L6, Lipid, -CH2-CH=CH-; L7, Lipid, -CH2-C=O; L8, Lipid, =CH-CH2-CH=; L9, Lipid, -CH=CH-; Lac, lactic acid; Leu, leucine; Lys, lysine; M, malonic acid; Met, methionine; Mol, methyl alcohol; NAG, n-acetyl-glycoprotein; PC, phosphocholine; Phe, phenylalanine; Py, pyruvic acid; Suc, succinic acid; Thr, threonine; TMAO, trimethylamine; Urea, Uric Acid; Val, valine.