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Why should you eat high fibre foods? – Written by Dr Harold Gunatillake Health writer Carbs with the high GI (glycaemic index), when digested in your gut, elevates your blood sugar. We call this, ”spiking blood sugar”. If your pancreas is making enough insulin there is no issue, the blood sugar level will come down to fasting levels within about two hours. If you do not secrete sufficient insulin, the absorbed sugar will remain in your blood and elevate your blood sugar level. This is exactly what happens in diabetes. Non-diabetics also shows high blood sugar levels after consuming carbs, but within two hours the level comes down to fasting levels. ‘Glucose tolerance test’ done to check for diabetes is based on this rationale Fibre found in high fibre foods is an indigestible form of carbohydrate and it does not get absorbed but passes through the large bowel as bulk in ...