Irritable Bowel Syndrome Message Boards | Re: fructose malabsorption and sweet potatoes

According to the reference below sweet potatoes do not contain fructans or excess fructose. Also, check "Sweet potato, cooked, baked in skin, with salt" in the USDA Food Database. It contains 0.66 grams fructose and 0.74 grams glucose per 100 grams for a ratio of fructose to glucose of 0.89 which means it contains more glucose than fructose or sweet potatoes contain no excess fructose. It is safe from a FM point of view. Yams have even less than sweet potatoes.

Which fruits are you wondering about? The amount of fructose in some fruits can change as they ripen. However, it isn't the amount of fructose that is so much of a problem as how much more fructose a fruit contains compared to glucose. Only the amount in excess of glucose is important. The amount of glucose can also change as a fruit ripens so it is quite possible that the safeness of a fruit might not change as it ripens.

Reference
Muir, J. G. et al. Fructan and Free Fructose Content of Common Australian Vegetables and Fruit . J. Agric. Food Chem. 55, 6619-6627 (2007)

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