Café cook Stacie Stewart helps the volunteers to turn their diets into delicious dishes. This time, Daria and Emma have seven days to slim down for a birthday bash; bridesmaids Emma and Elisa go on six week dieting plans for a forthcoming wedding; and entrepreneurs Dom and Adam want to slim down for a corporate summer party in four months. To find out how fasting affects body and mind, Xand goes on an extreme 'water-only' fast, and investigates if so called 'zero calorie' and 'negative calorie' foods really exist.