Yes you can definitely have delayed reaction. There is so much valuable information I have provided throughout all my post and it will be very helpful to read it. My kid had the issue from birth and progressively got worse until age 7 where she would get stomach ache from just eating rice. We had to carry her every where since she had lost a lot of weight. We ended up eliminating everything from her diet. Now she can eat so much more and doesn't have problems. She is allergic to gluten, milk, eggs and nuts and we avoid that in her diet. Fructose malabsorption can be tackled very easily if you follow the regimen. Read my post and I can further answer any questions you would have from it. I have handled fructose issues for the last 13 years with my kid and is it amazingly under ccontrol with no nausea, gas, bloating or other symptoms. Good luck!