Flax seed and oat bran are said to lower GI, what proportion is necessary to get a lowering effect?
To get a GI lowering effect the flaxseed or oat bran would need to replace some of the flour – the extra soluble fibre is what really has an effect on the GI. It’s difficult to put an absolute value on how much but we would estimate as least 10% in order to have a realistic effect on the GI. You need to weigh up how much can be added without negatively affecting the taste of the end product.
