This study links glycine to increased blood pressure. However, meat is the primary source of glycine. So, if the meat is loaded with omega-6, hormones...these will be the source of the inflammation and resultant increase in blood pressure, not the glycine. One must read these studies closely. No conclusion can be made from this study.
Unfortunately, on the summary is available to public, but review of nutrition for Diabetes points to Mediterranean diet, high vegetable intake, olive oil, and non-red meat intake for protein--particularily beans and legumes. Compare this to the average counseling for those with Diabetes today.