Breakfast On The Go: Not hungry yet? These quick single-serving ideas are perfect for packing up for when hunger strikes. Lose weight the 5:2 way. This healthy, quick and easy recipe is featured in the breakfast 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.