For years now, I have been keeping total carbs under 100 or less. Most of my carbs were coming from fruit, like a couple bananas, melon, apples, etc... a day. Since applying the PHD principle of 1 pound of potatoes a day, I have ended up eating almost no sugary fruit. I have never felt better. No gas, bloating, perfect BM's.
It must be pear season, because our local store had a huge display of pears...I couldn't resist, and bought a half-bushel. Within a day of eating 2-3 pears, I was so gassed up and bloated I couldn't believe it. I was blaming everything but the pears, though. I did a little Googling, and came across this site: TheFartingPear - fructose malabsorption food list and food search There it was: Fructose Malabsorption--staring me in the face for years.
When I was keeping under 50g carbs, my problems were mostly absent, but going above 100g meant stomach bloat and digestion problems. I always blamed 'carbs', but the only way I ever got above 100g was to eat sugary fruit.
I'm now eating 100-200g carbs a day in form of potatoes/sweet potatoes/rice and feeling great with no stomach distress.