2.5. Standard Meals
The use of standard meals ensured that the study participants consumed a comparable amount of polyamines with their food before and during the sampling on the measurement days. The standard meals were taken at the Institute for Nutritional Medicine and were composed as follows:Standard dinner (days 0, 4, 14, and 18): a medium-sized margherita pizza from a local delivery service; non-carbonated water ad libitum.Standard breakfast (days 1, 5, 15, and 19): mixed bread, butter, jam, honey, and orange juice; non-carbonated water ad libitum.Standard lunch (days 1, 5, 15, and 19): a medium-sized salad (lettuce, peppers, cucumber, tomatoes, and yogurt dressing) and one bun; non-carbonated water ad libitum.Standard snack (days 1, 5, 15, and 19): a piece of crumble cake; non-carbonated water ad libitum.The meals between the measurement days were not standardized. However, study participants were instructed to refrain from relevant dietary changes during the study course. Compliance with this instruction was ensured by reviewing the nutritional logs provided by the participants.