The cyclical keto diet alternates strict keto days with planned carb refeeds. Learn who it's for, how the protocol works, and the real science behind it.
Frequently Asked Questions
What is the cyclical keto diet?
The cyclical keto diet (CKD) alternates strict ketogenic phases — typically 5 to 6 days of under 50g net carbs — with 1 to 2 planned high-carbohydrate refeed days per week. The goal is to replenish muscle glycogen while preserving the metabolic benefits of regular ketosis.
How many carbs should you eat on a keto refeed day?
Most CKD protocols call for carbs to make up 60 to 70% of total calories on refeed days — roughly 300 to 400g at a 2,000 kcal intake. Fat drops to 5 to 10% of calories; protein stays at 15 to 20%. Focus on complex, high-glycemic-index carbs like white rice, sweet potatoes, and bananas to rapidly restore glycogen.
Will a carb refeed knock you out of ketosis?
Yes — and that is intentional. Eating 300+ grams of carbs raises blood glucose and stops ketone production. Most fat-adapted individuals return to nutritional ketosis within 24 to 72 hours of resuming strict keto, especially if they do high-intensity exercise on the day after refeeding.
Who should try the cyclical ketogenic diet?
CKD is best suited for experienced keto practitioners (minimum 4 to 8 weeks of standard keto) who do high-intensity training — such as HIIT, CrossFit, powerlifting, or sprint-based sports — where muscle glycogen is the primary fuel. It is not recommended for beginners, people with diabetes, or those whose primary goal is fat loss rather than athletic performance.
Is cyclical keto better than standard keto for muscle gain?
The evidence is mixed. A 2020 randomised controlled trial (Kysel et al., Nutrients) found that CKD effectively reduced body weight but did not improve strength or endurance performance over a standard balanced-reduction diet. The control group actually preserved more lean mass. CKD's muscle-building advantage is largely anecdotal; the science does not yet firmly support it.