Inhibitory activities of the methanol extract from Triticum aestivum L. sprouts were examined against ${alpha}$-amylase and ${alpha}$-glucosidase. The active constituents of T. aestivum were isolated by chromatographic techniques and identified as ${gamma}$-aminobutyric acid and ferulic acid on the basis of IR and NMR. ${gamma}$-Aminobutyric acid and ferulic acid showed the high inhibitory activities with $IC_{50}$ values of $5.4{pm}0.2$ and $9.5{pm}0.1$ mM against ${alpha}$-amylase, and $1.4{pm}0.4$ and $4.9{pm}0.3$ mM against ${alpha}$-glucosidase. The methoxy group on the hydroxycinnamic acid of ferulic acid derivatives played important functions in the ${alpha}$-amylase and ${alpha}$-glucosidase inhibitory activities. Based on the $IC_{50}$ values of nitrite-scavenging activity, ferulic acid ($98{pm}3.9{mu}g/mL$) was the most effective constituent, followed by ${gamma}$-aminobutyric acid ($182{pm}4.2{mu}g/mL$), sinapic acid ($301{pm}2.7{mu}g/mL$), and p-coumaric acid ($454{pm}2.2{mu}g/mL$). These results indicate that ${gamma}$-aminobutyric acid and ferulic acid could be useful as preventative agents, and possibly therapeutic modalities for the treatment of metabolic diseases.