Halloumi, Carrot & Bean Tacos | Lunch: Keep hunger pangs away with these healthy and delicious dishes! 150 calories and under. Lose weight the 5:2 way. This healthy, quick and easy recipe is featured in the lunch section of the new 5:2 Starter's Guide to The 2-Day Diet. The book provides a selection of over 100 tasty recipes that meet the daily 500 calorie allotment for the 2 days of intermittent fasting, as required by the 5:2 Diet.