A study shows that people who eat miso soup often or every day are less susceptible to have stomach diseases such as gastritis, gastric and duodenal ulcers than those who do not eat it at all. A more detailed survey on the eating habit of people by age indicates that everyday miso eaters in their 60's and older have a lower risk of getting stomach diseases . This result suggests that eating miso soup for a long period of time can prevent ulcers because your gastric and duodenal mucous membranes are protected by active ingredients of miso.