Mark Hyman's 10-day detox diet: how it works step by step

Dr. Mark Hyman says that if he could pick one test and one treatment for his patients, it would be the 10-day detox, because it works as both a diagnostic and a therapy. Here is how he explains the program, what it asks you to do and what to expect.

Why he created it

After nearly 40 years practicing medicine and 30 in functional medicine, Hyman concluded that food is information that upgrades or downgrades your biological software with every bite. He sees two basic problems in the modern diet: too much of what the body dislikes, which drives inflammation, harms the microbiome and creates insulin resistance, and too little of the protective foods that activate healing.

His early elimination diets produced striking reports. Patients came back saying their asthma, migraines, irritable bowel, depression, joint pain, acne and eczema were gone. He calls it "just the application of good science" and believes it is the most powerful tool in his toolkit. He named it a 10-day plan because few people would sign up for a one-year detox. The book came out in 2014.

He says the plan does three things: it corrects insulin resistance, which he has seen reverse type 2 diabetes but not type 1, repairs the microbiome and improves gut health, and reduces autoimmune activity.

Why take everything out

Hyman cites his mentor Sidney Baker's tack rules. If you stand on two tacks, removing one does not make you 50% better. Removing only gluten while still eating dairy leaves you sick, so the plan removes everything at once, then adds foods back. In practice it means taking out gluten, dairy, grains, beans, sugar, starch and ultra processed food. It is not a juice cleanse and there is no calorie restriction.

He also frames sugar as addictive. He points to the Yale Food Addiction Scale, which suggests about 14% of adults and 14% of children meet criteria for food addiction, and to functional MRI studies where sugar lights up addiction areas like heroin. In his view, cravings hijack brain chemistry, hormones and metabolism, and the way to stop them is to stop sugar, starch and processed food.

What to eat

Protein: chicken, beef, lamb, fish and shellfish.
Nuts and seeds, including as snacks.
Unlimited non-starchy vegetables, with a little sweet potato at dinner.
Low-glycemic fruit, mainly berries.
Eggs and vegetable omelets.

Start the day with protein and fat, and eat regular meals with protein, fat and fiber to balance blood sugar and insulin.

What you will feel

When sugar and starch drop, insulin falls and you lose water, because insulin makes you retain sodium. Then circulating antibodies to foods you used to eat form immune complexes, which can feel like the flu. For the first days you may be tired, so rest, nap and take electrolytes. By day 3 things improve, and by day 5 many people report that brain fog lifts, energy rises, sleep improves and joints stop hurting. On average, Hyman says people lose 8 pounds in a week and blood pressure drops 20 points.

Supplements, fasting and movement

Supplements: at the bare minimum, magnesium for constipation and vitamin C for inflammation and detoxification, plus electrolytes.
Fasting: do not go beyond about 14 hours overnight. You want plenty of food and no hunger.
Exercise: walk, do yoga and breathwork, take hot baths and sweat in a sauna, but avoid vigorous workouts for 3 to 5 days.
Vegetarians and vegans: use nuts, seeds, tofu and tempeh.

Reintroducing foods

Do not order pizza on day 11. After the reset, antibodies are still circulating and a big reintroduction can cause a strong immune response. Add one food category at a time, such as gluten, then dairy, eating it for about three days and keeping a journal. Delayed sensitivities show up a day or two later, such as a migraine two days after eggs.

How to measure progress

Fill in the medical symptom questionnaire, scoring symptoms from 1 to 4, on day 1, day 5 and day 10. Hyman reports a 70% average drop. He also notes a Cleveland Clinic rheumatology analysis of his clinic data and says outcomes were better, though he admits the diet needs more research.

Why you may not notice the change

People are funny about this, Hyman says: they forget how bad they felt. That is why he has patients fill out the questionnaire at every visit. Someone who says the plan is not working may have gone from a score of 120 to 32. Many people also say they did not know they felt so bad until they started feeling so good, because their normal was not good.

Conclusion

Do the plan once a quarter, or at least twice a year, and treat the result as news about your own body. If you feel dramatically better, some foods were affecting your immune system, hormones and microbiome.