“…With regard to peptic ulcer, Nicol (20) has suggested that in the aetiology of gastric ulcer, local trauma of the gastric mucosa is the important factor, while in the aetiology of duodenal ulcer psycho-physiological disturbances are to be identified as the operative factors. Nicol compares the relative incidence of the two types of ulcer, and suggests that" the swing from a preponderance of gastric ulcers to a preponderance of duodenal ulcers that has occurred since the beginning of the twentieth century" is partly due to "an improvement in the nation's diet and a spread of knowledge regarding physiological methods of eating."…”