For lunch, I often eat a delicious sausage with ketchup and mayonnaise, lettuce, and tomatoes. A naturopath advised me to stop with the sausage. Why?
Sausage may be delicious, but it is usually one of the most processed foods. Ketchup and mayonnaise also often undergo processing that impairs nutritional values. Although you did not mention that you drink a soft drink with the sausage (I guess), it is a considerable load of industrialized and processed foods that are unsuitable for patients with chronic bowel diseases. It is a highly inflammatory food that causes cumulative health damage.