The study investigated the mechanism by which glycine protects against increased circulating nonesterified fatty acids (NEFA), fat cell size, intra-abdominal fat accumulation, and blood pressure (BP), induced in male Wistar rats by sucrose-ingestion. The addition of 1% glycine to the drinking water containing 30% sucrose, for 4 weeks, markedly reduced high BP in sucrose-fed rats (SFR) (122.3±5.6 vs. 147.6±5.4 mmHg in SFR without glycine, p<0.05). Decreases in plasma TG levels (0.9±0.2 vs. 1.4±0.3 mM, p<0.001), intra-abdominal fat (8.9±3.6 vs 21.2±4.9 g, p<0.005), and adipose cell size were observed in SFR treated with glycine, as compared to SFR without treatment. Total NEFA concentration in the plasma of SFR was significantly decreased by glycine intake (0.68±0.08 vs. 1.11±0.09 mM in SFR without glycine p<0.001). In control animals, glycine decreased glucose, TGs, and total NEFA but without reaching significance. In SFR treated with glycine, mitochondrial respiration, as an indicator of the rate of fat oxidation, showed an increase in the state IV oxidation rate of the -oxidation substrates, octanoic acid and palmitoyl-carnitine. This suggests an enhancement of hepatic fatty acids metabolism, i.e., in their transport, activation, or -oxidation. These findings imply that the protection by glycine against elevated BP might be attributed to its effect in increasing fatty acid oxidation, reducing intra-abdominal fat accumulation and circulating NEFA, which have been proposed as links between obesity and hypertension.