Table 4 Age- and gender-adjusted correlations of plasma amino acid concentrations with obesity and glucose metabolism indices
|  | Body weight | BMI | WC | VFA | SFA | FPG | 2-h PG | HOMA-IR | OGIS | HOMA-β | II |
|---|---|---|---|---|---|---|---|---|---|---|---|
Essential AAs | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 Histidine | — | — | — | — | — | — | — | — | — | — | — |
 Isoleucine | — | — | — | — | — | — | — | — | — | — | — |
 Leucine | — | — | — | — | — | — | — | — | — | 0.288 | — |
 Lysine | — | — | — | — | — | — | — | — | — | — | — |
 Methionine | — | — | — | — | — | — | — | — | — | — | — |
 Phenylalanine | — | — | — | — | — | — | — | — | — | — | — |
 Threonine | — | — | — | — | — | — | — | — | — | — | — |
 Tryptophan | — | — | — | 0.206 | — | — | — | — | — | 0.259 | — |
 Valine | 0.202 | 0.247 | 0.296 | — | 0.348 | — | — | 0.380 | - | 0.272 | 0.419 |
Nonessential AAs | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | |
 Alanine | — | — | 0.184 | — | — | — | — | — | — | — | — |
 Arginine | — | — | — | — | — | — | — | — | — | — | — |
 Asparagine | — | — | — | — | — | — | — | — | — | — | — |
 α-ABA | — | — | — | — | — | — | — | — | — | — | — |
 Citrulline | −0.183 | −0.286 | −0.358 | −0.285 | −0.382 | — | — | −0.296 | - | −0.323 | −0.307 |
 Cystine | — | — | — | — | — | — | — | — | — | — | — |
 Glutamate | 0.247 | 0.327 | 0.352 | 0.362 | 0.401 | 0.395 | 0.310 | 0.436 | −0.377 | 0.243 | 0.403 |
 Glutamine | −0.265 | −0.308 | −0.282 | −0.233 | −0362 | — | — | −0395 | — | −0.341 | −0.434 |
 Glycine | −0.221 | −0.364 | −0.316 | −0.311 | −0.311 | — | — | −0.325 | 0.226 | −0.309 | −0.380 |
 Ornithine | — | — | — | — | — | — | — | — | — | — | — |
 Proline | — | — | — | — | — | — | — | — | — | — | — |
 Serine | — | — | — | — | — | — | — | — | — | −0.280 | — |
 Taurine | — | — | — | — | — | — | — | — | — | — | — |
 Tyrosine | 0.164 | — | — | — | — | — | — | 0.226 | −0.238 | — | — |