THE G.I. FACTOR: THE EFFECT OF FAT AND PROTEIN ON THE G.I. FACTOR

High fat foods that have a low G.L factor may appear in a falsely favourable light because increases in fat and protein tend to slow the rate of stomach emptying and therefore the rate at which foods are digested in the small intestine. High fat foods will therefore tend to have lower G.I. factors than their low-fat equivalents. For example, potato crisps have a lower G.I. factor (54) than potatoes baked without fat (85). Many sweet biscuits have a lower G.I. factor (55 to 65) than bread (70). But this is not a consistent finding. New boiled potatoes have a lower G.I. factor (62) than French fries (75), despite the latter’s fat content.

Remember, however, we need to eat a low-fat diet, not a high fat one. So, high fat foods of any sort, whether low or high in their G.I. factor, should only be eaten in limited amounts.

Why does pasta have a low G.I. factor? The starting point for making pasta is semolina or cracked wheat, not wheat flour. Durum wheat makes the best pasta because the grain is extremely hard and the wheat breaks cleanly into distinct small pieces. The large particle size of semolina means that starch gelatinisation is more difficult and thus enzyme attack is slowed down. The typical shape of pasta also appears to play a role in slowing down digestion. That’s why pasta of any shape and size has a fairly low G.I. factor (30 to 50). Cracked wheat and couscous used in Middle-Eastern cooking have intermediate G.I. factors.

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