Diverticulitis develops from a condition called diverticulosis. If you're older than 40, it's common for you to have diverticulosis - small, bulging pouches (diverticula) in your digestive tract. In the United States, more than 50 percent of people older than 60 have diverticula.

Diverticulitis diet explained pretty well here, high fiber low fiber quite good.

Some useful diverticulitis treatment options to consider if you suffer from diverticular disease

Diverticulitis develops from a condition called diverticulosis. If you’re older than 40, it’s common for you to have diverticulosis - small, bulging pouches (diverticula) in your digestive tract.

The Diverticulitis Diet is the diet recommended by doctors to people recovering from an attack of diverticulitis. Diverticulitis is a common digestive disorder, which is characterized by the inflammation of pouches called diverticula on the outside of the colon. This article helps you understand about this condition and the diet itself

Coeliac disease, also spelled celiac disease, is an autoimmune disorder of the small bowel that occurs in genetically predisposed people of all ages from middle infancy. Symptoms include chronic diarrhoea, failure to thrive (in children) and fatigue, but these may be absent and symptoms in all other organ systems have been described. It is estimated to affect about 1% of Indo-European populations, but is significantly underdiagnosed. A growing portion of diagnoses are being made in asymptomatic persons as a result of increasing screening.Coeliac disease is caused by a reaction to gliadin, a gluten protein found in wheat (and similar proteins of the tribe Triticeae which includes other cultivars such as barley and rye). Upon exposure to gliadin, the enzyme tissue transglutaminase modifies the protein, and the immune system cross-reacts with the bowel tissue, causing an inflammatory reaction. That leads to flattening of the lining of the small intestine, which interferes with the absorption of nutrients. The only effective treatment is a lifelong gluten-free diet.This condition has several other names, including: cœliac disease (with "œ" ligature), c(o)eliac sprue, non-tropical sprue, endemic sprue, gluten enteropathy or gluten-sensitive enteropathy, and gluten intolerance. The term coeliac derives from the Greek κοιλιακος (koiliakos, abdominal), and was introduced in the 19th century in a translation of what is generally regarded as an ancient Greek description of the disease by Aretaeus of Cappadocia.