A patient was given a high-carb meal at 0 minutes. They were later diagnosed with Type 2 diabetes. Their blood glucose levels were monitored over a 3-hour period, as shown in the table below.
| Time after meal (minutes) | Blood glucose concentration (mmol/dm3\text{mmol/dm}^3mmol/dm3) |
|---|---|
| 0 | 7.1 |
| 30 | 11.4 |
| 60 | 14.9 |
| 90 | 14.7 |
| 120 | 14.1 |
| 150 | 12.8 |
| 180 | 11.5 |
Explain why the blood glucose concentration of this patient remained high between 60 and 120 minutes.