4-day ad libitum menu for the 10%, 15% and 25% protein study periods.

Foods offered during the 10%, 15% and 25% protein 4-day ad libitum study periods. The methodology used to design each of these foods and the final nutritional information can be found elsewhere [22]. Some foods were only available in one meal sitting (‘meal time foods’: not bold), whereas others were available to participants anytime once served (‘anytime foods’: bold). Anytime foods were ‘snack’ foods and foods that were first served at a meal and could be kept if not eaten or finished at that meal; these foods were labelled for identification and kept in a refrigerator to which participants had free access.