Talk to Gastroenterologist on Bloating With No Change In Diet

My whole family has been feeling very bloated recently when we had no change in diet at all. Mostly we eat home cooked food, and nothing too extravagant or too much. Everyone is in normal weight range and always do mild exercise. But recently all feel bloated mostly at night. With exaggerated bowel sounds. We tried changing the spices, oil etc. can it be the iodized salt? Or wheat that we use? No one has any known food allergy.