hi lets start with the most common causes of loose stools and change in bowel habits.. 1)chronic gastric infection like amebiosis 2)irritable bowel syndrome which occurs in persons who are under stress..too thoughtful or anxious by nature 3)thyroid and other illness if you have other features of thyroid such as increased sweating..weight loss..palpitations..then thyroid can be suspected..other wise its nothing to worry here are my recommendations to you 1)include high fiber diet..eat fresh veggies and fruits..have 2 apples a day 2)drink plenty of juices 3)avoid spicy and fried food stuffs 4)try to have your dinner before 8 5)daily exercise is a must most importantly..maintain a regular and healthy routine 6)lessen down caffeine intake as it contributes to acidity with these changes in your life style you will conquer most of your problems best luck