The results of metabolomics analysis of carbohydrate metabolism in relations to production and elimination as well as the effect of methylglyoxal. ↑, level higher in group with higher drip loss in comparison to group with lover drip loss; ↓, level lower in group with higher drip loss in comparison to group with lover drip loss; NADP , Nicotinamide adenine dinucleotide phosphate; NADPH, is the reduced form of NADP; GSH, reduced glutathione; GSSG, oxidized glutathione; AGE, advanced glycation end products.