Here is a snippet of an article from Wikipedia regarding symptoms and foods that cause fructose malabsoption problems. (The link to the full article can be found at the end.)
This condition is common in patients with symptoms of Irritable Bowel Syndrome and most patients with fructose malabsorption fit the profile of those with Irritable Bowel Syndrome.[8] A small proportion of patients with both fructose malabsorption and lactose intolerance also suffer from celiac disease. Dr. De Meirlier[citation needed] has found that 45% of his patients with Chronic Fatigue Syndrome suffer from fructose malabsorption and 10% suffer from lactose intolerance.
Typical symptoms of fructose malabsorption include:
- Bloating (because of fermentation in the small and large intestine)
- Diarrhea and / or constipation
- Flatulence
- Stomach pain (due to muscle spasms, which can vary from mild and chronic to acute but erratic)
Other possible symptoms of fructose malabsorption include:
- Aching eyes
- Fuzzy head
- Fatigue
- Depression[9] as a result of absorption disorders in the small and large intestines, other substances such as amino acids are not absorbed. Because of missing substances (among others tryptophan), hormones and neurotransmitters cannot be synthesized.
According to the USDA database,[10] foods with more fructose than glucose include:
Food  |
Fructose (grams / 100 grams) |
Glucose (grams / 100 grams) |
|---|---|---|
| Apples | 5.9 | 2.4 |
| Fruit juice e.g. Apples, Pears |
5 to 7 | 2 to 3 |
| High fructose corn syrup |
55 to 90 | 45 to 10 |
| Sucrose | 50 | 50 |
| Honey | 40.9 | 35.7 |
| Watermelon | 3.4 | 1.6 |
| Pears | 6.2 | 2.8 |
| Raisins | 29.8 | 27.8 |
There is a lot of misinformation and misconception about fruit sugar content. A common belief is that fruits contain mainly, or only, fructose sugar. The USDA food database reveals that many common fruits contain nearly equal amounts of the fructose and glucose.[11] There is a tendency within plants to keep these sugars 50/50. The only aberrantly high fructose fruits are apple and pear, which have twice as much fructose as glucose. Fructose levels in grapes varies with ripeness and variety, with unripe grapes containing more glucose.
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February 19th, 2010 at 9:25 pm
Other sugars may also need to be avoided - polyols (like sorbitol) and fructans (found in wheat and onions, etc.)