** Thanks for contacting with your health concern and at your age [69 years] initially some physiological factors which have to be kept in mind are: i. As the age progresses people tend to produce less acid [HCl] called as hypochlorhydria resulting in impaired/slower digestion. [and veggies are most affected since vegetarian diet are low in protein which can result in decreased production of HCl] ii. Lactose intolerance. iii. vitamin B12 deficiency [intrinsic factor] level also decrease as the age progress and thus they are more prone to atrophic gastritis 2. So it is best to put on a dietary regime which is free from causing stomach upset/burping, like - Lactose-free product like soy milk, lactose-free milk, potato, rice, barley, margarine without butter/milk, fruit and vegetable juice, plain herbs and spice, jellies, jams - maintain a diet with low glycemic index/low fat. - eat smaller meals regularly and chew food thoroughly. - take a multivitamin which includes B3 and B12. . increase intake of fiber and omega 3 fatty acids PS. check with vitamin B12 level