Hi.
Thanks for your query.
Noted the history about 66 year old person having discomfort in abdomen, pain and in abdomen and feeling as though not completely emptied the bowel. Wants to know whether this be related to yeast in bread. Doing plenty of exercises, have healthy diet and plenty of fresh vegetables.
It is but possible that the yeast in bread can cause this as many do not have suitability to the breads, also related to
gluten in it.
But to know the proper cause I would advise you the following:
Send the stool for tests.
Ultrasonography and Sanding X-ray of the abdomen.
Tests of blood and urine.
Clinical evaluation, physical examination and correlation with the reports can give you the correct diagnosis and a proper plan of treatment.
Try to identify the foods and beverages that instigate or enhance your problems and stop once found, stop bread and bakery products.
If the medication do not help, please go for an opinion of a Gastroenterologist and
CT scan and
colonoscopy if asked for.