The 2-Day Diet: Diet two days a week. Eat the Mediterranean way for five.Lose weight fast with the international diet sensation. Diet two days a week. Eat a Mediterranean diet for five. The 2 Day Diet is easy to follow, easy to stick to, and clinically tested. Simply eat a low carb, high protein diet two days a week, and follow the classic Mediterranean Diet (now recognized as the gold standard in warding off heart disease) for the other five. The 2 Day Diet is designed to maximize weight loss, minimize muscle loss and