This study aimed to elucidates the dietary characteristics of the dietary life and lifestyle of men in their fifties with impaired glucose tolerance (IGT). We compared the results of from medical check-ups and questionnaires among 412 new-onset IGT patients( IGT, : n=205, ; IFG+IGT, : n=207) and 203 healthy controls with no differences in body mass index and energy intake. The dietary characteristics of the dietary life and lifestyle of the men with IGT involvedwere the following items: skipping breakfast, large amounts of snack foods and alcohol, frequent eating -out, unbalanced diet, preference for strong sweet and salty tastesflavors, an excessive intake of animal proteins, animal fats, and salt, and insufficient intake of dietary fibers, smoking, and low daily activity. We noticed, particularly in the IFG+IGT group, that these subjects had continued to have a problematic diet and lifestyle for a long time. The results suggest that the onset of IGT was associated with their diet and lifestyle.