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The below may or may not help. Frustratingly, it's different for everyone.
Be boring - or to use the medical term "regular". Variety can be a killer. Eating the same breakfast, at the same time, with the same drink, every day might seem dull to begin with - but if it prevents the problem it may be worth doing.
If you can extend this to other meals, it does help - but breakfast is the biggie as you'll not have been eating / digesting anything overnight. What you eat first "sets the tone" for the day to come.
Relax. Easier said than done. But spending loads of time going to the loo can be really stressful... and the stress can result in you going to the loo more. Try to break the cycle. Take your time. Take a book / magazine / portable games console.
Plenty will advise to eat little and often, but that doesn't work for everyone. Instead think about the consistency of the food and drink you consume, and the order in which you consume it. How will your body break down what you put in and what will that look like on the other side? Three big, stodgy meals isn't impossible - so long as the stodge is good for you and you're (for want of a better word)
lubricating the process with what you eat / drink and between. Caffeinated drinks can help (but not for everyone). Avoid carbonated drinks. Don't rush your eating.
Be tactical with pairings. Do spicy foods cause you problems? Citrus fruits / drinks? Pair with something you know is "safe" so it all goes down together nicely.
Quality of ingredients. Consider it. It can go either way. Plainer can often mean more processed, but not always. Plainer might be better; less processed might be better. It's all individual to you. What kind of bread do you eat, if you eat bread at all? How does it make you feel when you do? What about pasta / rice / other carbs?
Anything that you know is high in fibre should be considered accordingly. Remember, your body doesn't process this stuff in the same way as most people's bodies, and the producer of the food hasn't necessarily considered your needs when creating / marketing the product. So for Joe E. Regular, starting the day with a bowl of high fibre cereal might be just the thing. But if you're already "too" regular with the ol' bathroom breaks, deliberately consuming something designed to speed up the process (potentially as your first meal of the day!) might have too significant an impact to bear, particularly if consumed with milk or a milk substitute.
Drink water. Lots and lots of plain cold water. Sometimes a warm water (half boiled, half cold - avoid warm tap water) can "assist" if you're already caffeinated enough.
Booze bloats. Approach selectively.