The 5:2 diet — eating normally 5 days per week, restricting to 500–600 calories on 2 non-consecutive days — became globally popular following Michael Mosley’s work. Combined with keto, it creates a powerful metabolic protocol.
Standard 5:2 reduces calories but does not restrict carbohydrates on eating days. Keto 5:2 maintains ketosis throughout: eating standard keto on 5 days and eating minimal keto-compliant food (500 cal) on 2 days.
Keto provides steady energy and suppressed hunger throughout the week. Fasting days on an already fat-adapted body are dramatically easier than fasting from a carb-burning state.
On 500-calorie keto days: 2 eggs (150 cal), a large salad with olive oil (200 cal), and some bone broth (50 cal) = ~400 calories, fully keto, deeply satisfying.
Experienced keto practitioners (3+ months) who have reached a plateau or want to accelerate fat loss without permanently increasing restriction.
Our keto beverages — bone broth, herbal teas, electrolyte water — are perfect for fasting days. Break your fasting day carefully with simple meals from our keto breakfast collection.