1 - Too little Stomach Acid: This will come as a shock but when your body has too little stomach acid that's when the problems start. Your stomach will reflex to either shoot the food out in order to prevent bacteria on the food from passing through your digestive system or it will churn and try to break it down without the acid. In either case it causes an upset stomach quite often, one easy solution to it is to avoid liquids entirely with meals as this only dilutes stomach acid further.
2 - Lack of bowel movements: When you go less than 2 times per day you're considered constipated believe it or not! What happens is the food sits in your intestines and begins to ferment and putrefy, this creates an excessive amount of gas which travels up the digestive tract back into the stomach or will apply pressure to the stomach and create tremendous bloating.
3 - Candida Overgrowth: You may never have heard of this before but this yeast is likely inside your body causing havoc right now as it exists in over 90% of people. Although not always creating symptoms for everyone, this yeast can cause ongoing health problems if not addressed. One of the #1 symptoms it causes is excessive gas, the reason being that this fungus will grow inside your intestines and ferment, especially when there has been a lack of bowel movements even temporarily. It feeds on sugar as well so if you eat a diet of processed foods then you're giving it exactly what it needs to grow further! The gas it creates is only one of many problems candida can cause such as anxiety, difficulty concentrating, allergies, IBS & other digestive problems and much more!