Keto series · Part 3 of 7

Benefits of cyclical keto

What if you could do keto <i>and</i> enjoy some healthy carbs, feed your gut bacteria, support your thyroid, and boost athletic performance? That’s the idea behind cyclical keto — a strategic variation that builds planned carb days into the plan.

Key takeaways
Cyclical keto = mostly keto (5–6 days a week) with 1–2 planned high-carb “refeeding” days.
Refeeding replenishes glycogen and can offset downsides of long-term standard keto — including thyroid and adrenal strain.
Refeed on nutrient-dense carbs (sweet potato, quinoa, rice, squash, beets) — not junk.
Reported benefits: better athletic performance, digestion, and gut bacteria — plus a strategic carb “indulgence.”
Strategic carbs help reset leptin — the satiety-and-metabolism hormone — which can help with stubborn weight.
In this article
What is the cyclical keto diet?
Low-carb days & high-carb refeeding days
Getting back into ketosis
The benefits
Leptin and cyclical keto

We’ve covered the ketogenic diet and how to do it the right way for the best benefits. We know keto can support weight loss by suppressing hunger hormones and burning through fat stores, boost energy and focus by running on ketones, and lower inflammation — which may protect against conditions like Alzheimer’s and cancer and reduce symptoms in autism.

What we haven’t covered is a highly effective variation. What if there were a way to do keto while also enjoying healthy carb cravings, improving your gut bacteria, and boosting athletic performance? Let us introduce you to cyclical keto.

What is the cyclical keto diet?

On cyclical keto, you move in and out of ketosis on a weekly basis. On the standard ketogenic diet, you want your body to switch from running on glucose to running on ketones — which means keeping to no more than 15–30 grams of net carbs per day and a makeup of roughly 70% fat, 20% protein, and 10% carbs. On cyclical keto, you follow that formula for 5–6 days a week to stay in ketosis.

Low-carb days — 5–6 days/week
Quality meats & fish (pastured, wild-caught, grass-fed)
Free-range, organic eggs
Organic fruit & nut oils (coconut, olive, avocado)
Full-fat dairy (if tolerated)
Pastured animal fats
Lots of fresh, low-carb vegetables
Low-carb berries
High-carb refeeding days — 1–2 days/week

On these days you flip the macros to about 60–70% carbs, 15–20% protein, and 5–10% fat, temporarily leaving ketosis to refill depleted glycogen. Still focus on quality — this isn’t the time for the donut and a sugary iced coffee. Choose nutrient-dense carbs:

Sweet potatoes
Quinoa
Brown or white rice
Butternut squash
Beets
Yams
Beans

The goal with these carbs is to build muscle and store glycogen rather than body fat.

Why this matters for your thyroid
Long-term standard keto can run into thyroid issues.1 In ketosis, the body behaves as if it’s in a prolonged fasting state, which can affect adrenal and thyroid function and, over time, contribute to dry eyes and sinuses, insomnia, and fatigue. Strategic carb refeeding days help offset these downsides — one reason cyclical keto can be a better long-term fit, especially if you have a thyroid condition.

Getting back into ketosis

After refeeding days, intermittent fasting (a 16-hour fast with an 8-hour eating window) helps your body drop back into ketosis. It also helps to do a high-intensity workout the day after refeeding to deplete glycogen stores and build lean muscle.

The benefits

1
Better athletic performance. We need more research, but many people on cyclical keto report improved performance and more lean muscle. In one study of elite race-walkers, athletes who periodically ate high-carb outperformed those who stayed strictly low-carb.2
2
Improved digestion. With a bit more fiber on your plate, cyclical keto can regulate digestion — a relief if you struggle with constipation on standard keto.
3
A strategic carb indulgence. You get to enjoy some healthy carbs. Donuts and white bread are still off the table, but your body benefits from nutrient-dense, strategic carbohydrates.
4
Improved gut bacteria. Variety feeds a healthier microbiome. Adding higher-carb foods — especially prebiotic ones — a day or two a week nourishes good gut bacteria, which in turn supports immunity, mood, and overall well-being.

Leptin and cyclical keto

Leptin is a hormone that regulates energy, hunger, and satiety and is tied to metabolism. Made in fat cells, it travels through the bloodstream and tells the brain whether you need to eat.3 Everyone has a leptin threshold: above it, the brain signals you to stop eating and burn energy; below it, to eat and conserve. Normally, higher leptin speeds metabolism — good for weight loss. But in people who are obese and eating a high-calorie, high-carb diet, leptin can be high while the brain never gets the “satisfied” message, prompting more eating. That’s leptin resistance.

Cyclical keto has the advantage of strategically maneuvering leptin. On low-carb diets, leptin often runs low — nudging the brain to eat, conserve, and slow down, which can stall those last stubborn pounds. Higher carbs signal the body to raise leptin, stop eating, and speed metabolism. Crucially, leptin doesn’t rise over a single meal; it rises over a period of higher-carb intake. Eating high-carb for 1–2 days helps raise and reset leptin, keeping you “leptin sensitive” — and helping you shed the weight you’ve been trying to lose.4

As you can see, strategically adding higher-carb days to keto has real benefits. This is a type of ketogenic diet best guided by professional expertise — please reach out and we’ll help you do it well.

Common questions

What is the cyclical keto diet?
Cyclical keto means going in and out of ketosis weekly. For 5–6 days you eat standard keto (~70% fat, 20% protein, 10% carbs, 15–30 g net carbs a day); for 1–2 days you eat high-carb “refeeding” days that temporarily take you out of ketosis to replenish glycogen.
What should I eat on refeeding days?
Nutrient-dense, quality carbs — sweet potatoes, quinoa, brown or white rice, butternut squash, beets, yams, beans — not donuts or sugary drinks. Macros shift to roughly 60–70% carbs, 15–20% protein, 5–10% fat, aiming to build muscle and store glycogen rather than body fat.
Does cyclical keto help with the thyroid issues of standard keto?
It can. Long-term standard keto keeps the body in a prolonged fasting-like state that may affect adrenal and thyroid function and cause dry eyes and sinuses, insomnia, and fatigue. Strategic high-carb refeeding days can help offset these downsides — worth discussing if you have a thyroid condition.
How does cyclical keto affect leptin?
Leptin signals satiety and speeds metabolism. On low-carb diets it tends to run low, which can stall weight loss. Higher-carb intake raises leptin — over a day or two, not a single meal — which helps keep you “leptin sensitive” and can support losing stubborn weight.
References (4) ▾
  1. Ketogenic diet and thyroid function. PubMed. https://pubmed.ncbi.nlm.nih.gov/28076316/
  2. Burke LM, et al. Low-carbohydrate training impairs performance in elite race-walkers; periodized carbohydrate improves it. PubMed Central. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5407976/
  3. Klok MD, Jakobsdottir S, Drent ML. The role of leptin and ghrelin in the regulation of food intake and body weight in humans: a review. Obes Rev. 2007;8(1):21-34. https://pubmed.ncbi.nlm.nih.gov/17212793/
  4. Dirlewanger M, et al. Effects of short-term carbohydrate or fat overfeeding on energy expenditure and plasma leptin concentrations in healthy female subjects. Int J Obes. 2000;24(11):1413-1418. https://pubmed.ncbi.nlm.nih.gov/11126336/
This article is educational and is not medical advice, diagnosis, or treatment. Cyclical keto is best guided by a qualified practitioner, especially with a thyroid or metabolic condition.
Keto that works with your hormones.

Cyclical keto is powerful but nuanced — especially around thyroid, adrenals, and stubborn weight. We’ll help you time it right for your body.

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