Table 3 Correlations of plasma amino acid concentrations with indices of obesity and glucose metabolism
|  | 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 | 0.413 | 0.305 | 0.345 | 0.332 | — | — | — | — | — | — | — |
 Leucine | 0.488 | 0.300 | 0.361 | 0.413 | — | — | — | — | — | — | — |
 Lysine | 0.307 | — | 0.290 | — | — | 0.236 | — | — | −0.257 | — | — |
 Methionine | — | — | — | — | — | — | — | — | — | — | — |
 Phenylalanine | 0.276 | — | — | — | — | — | — | — | — | — | — |
 Threonine | — | — | — | — | — | — | — | — | — | — | — |
 Tryptophan | — | — | — | 0.289 | — | — | — | — | — | — | — |
 Valine | 0.539 | 0.387 | 0.482 | 0.397 | — | 0.254 | — | 0.219 | −0.297 | — | — |
Nonessential AAs |  |  |  |  |  |  |  |  |  | — | |
 Alanine | — | — | — | — | — | — | — | — | — | — | — |
 Arginine | — | — | — | — | — | — | — | — | — | — | — |
 Asparagine | — | — | — | — | — | — | — | — | — | — | — |
 α-ABA | — | — | — | — | — | — | — | — | — | — | — |
 Citrulline | — | — | −0.242 | — | −0.395 | — | — | −0.291 | — | −0.375 | — |
 Cystine | 0.276 | — | 0.285 | — | — | 0.236 | — | — | — | — | — |
 Glutamate | 0.548 | 0.443 | 0.528 | 0.568 | — | 0.439 | 0.302 | 0.292 | −0.458 | — | — |
 Glutamine | −0.241 | −0.289 | −0.326 | −0.272 | −0.396 | — | −0.220 | −0.398 | — | −0.311 | — |
 Glycine | −0.333 | −0.418 | −0.426 | −0.426 | −0.294 | — | −0.247 | −0.317 | 0.303 | −0.231 | — |
 Ornithine | — | — | — | — | — | — | — | — | — | — | — |
 Proline | — | — | — | — | — | — | — | — | — | — | — |
 Serine | −0.368 | −0.273 | −0.351 | −0.379 | — | — | — | — | 0.258 | — | — |
 Taurine | — | — | — | — | — | −0.240 | — | — | — | — | — |
 Tyrosine | 0.335 | — | 0.314 | 0.252 | — | 0.269 | — | — | −0.327 | — | — |