Q&A: What kind of food intolerance is this?

Kelly writes:

"I have a 20-mnth-old son that has had problems with food since day 1.  I breastfed him for only 6 weeks as he would have screaming attacks, wouldn't settle and a lot of crying.   Nothing changed when I changed things in my diet.  He wasn't a lot better on formula and at 3 months the Doctor said it was Reflux but all the reflux meds just made him more grizzly.  When he started on solids he didnt get any better either.

There are so many things he can't eat now, it's really hard finding something he CAN eat.   The only common denominator we can find in the foods he can't eat, is sugar/fructose.  Can you maybe find some connection in the foods below?  We have been to paediatricians, dieticians, nutritionists, had a ultrasound done, gastroenterologist, cealic test done and they all say nothing is wrong with him as he is putting on weight and doesn't come out in rashes or anything else to suggest allergies..  But when he eats something he can't handle, he gets VERY whingy, gassy, wakes up screaming, constipated, but doesn't get diarrhea.

Rice, noodles, pasta, corn, maize, carrots, breadsticks, raisins, bananas, biscuits, cornflakes, rice bubbles, spaghetti, jam, medicines,  yoghurts (unles they have no sugar or fruit) and even pears and other fruits for babies..

Please help."

Let's put the foods into categories. It sounds like he has a problem with carbs, including wheat (noodles, pasta, breasdsticks, biscuits, spaghetti), rice (rice, rice bubbles), and corn (corn, maize, cornflakes). The rest are fruits or sweet vegetables.

I'm going to guess yeast overgrowth, because those carbs and the sugars feed yeast. To find out, put him on probiotics like acidophilus or unsweetened kefir (like drinkable yogurt, but with way more active cultures). If you start giving him the probiotics they will help the good bacteria in his stomach overcome the yeast overgrowth. Some people with big yeast problems go through a few days of feeling very tired while the yeast gets under control before they start to feel better. I'd give the probiotics two weeks, and if you don't see any difference, eliminate yeast as a cause and move on to the next thing.

Remember that I'm not a doctor or nutritionist, just a mom with a wheat intolerance and an interest in natural health who knows how to use Google. Neither acidophilus nor kefir have negative side effects, although they can cause your digestive system to move a little faster than it usually does.

Does anyone else have any other thoughts about what this intolerance could be?

Let me know what happens with the probiotic treatments, and if they work or if we need to look for something else.