I use flaxseed and chia seeds in my smoothies. Remember to grind your chia seeds for easier digestion. They're natural gel like composition makes them indigestible and hard for your body to absorb the chia seeds nutrients.
A small but growing contingent of specialists is focusing on food intolerances as a possible culprit behind irritable bowel syndrome. A new dietary approach, called the low Fodmaps diet, is gaining attention.