No detox diet removes “toxins” your liver and kidneys are not already handling, so the best of the five below is the one that is really just eating more plants and less sugar. We ranked the five classic plans on how much they help and how much they can hurt, ahead of a summer holiday.
| Rank | Plan | Typical length | Our verdict |
|---|---|---|---|
| 5 | Juice cleanse | 3 to 5 days | Most hype, most downsides |
| 4 | Smoothie cleanse | 1 week | Fine as a meal swap, not a cure |
| 3 | Hypo-allergenic (elimination) detox | 1 week to start | Useful if done properly |
| 2 | Sugar detox | As long as you like | Backed by public health advice |
| 1 | Fruits and vegetables | 2 to 3 days | Low risk, a decent reset |
What does a detox diet actually do?
Health bodies and dietitians describe “detox” as a marketing idea rather than a medical one. The “toxins” are rarely named, and the real detoxing is done by your liver and kidneys, around the clock, for free. A short plan may drop the scale a little through strict calorie cuts, but the weight tends to return once normal eating resumes.
That does not make a few cleaner days pointless. Eating more produce and fewer ready meals is good for most people. Just do not expect a miracle, and do not treat a bikini date as a reason to starve.
5. Juice Cleanse
The hardest plan and the one with the most downsides. You drink only vegetable or fruit juices, ideally pressed fresh each day instead of bottled.
Reported risks include dizziness, diarrhoea leading to dehydration, protein and calcium shortfalls on long runs, and trouble for anyone with undiagnosed diabetes or low blood sugar. Cancer research charities have said there is no scientific evidence that juice-only days reduce cancer risk or give other health benefits. If you try it, keep it short, skip hard workouts, and talk to a doctor first if you have any medical condition.
Length: 3 to 5 days
4. Smoothie Cleanse
Smoothies keep you fuller than juice because the fibre stays in. Blend fruit and vegetables, and if your needs are high add protein powder, wheat germ or other supplements. Plant milks such as rice, soy or almond are the usual swap for dairy.
Treat it as one or two meals replaced by smoothies for a week, with real food in between. Not a miracle, but easy to follow and tasty.
Length: 1 week
3. Hypo-Allergenic (Elimination) Detox
This one is the closest to real medicine. An elimination diet removes suspected foods, then reintroduces them one by one to see which trigger symptoms. Commonly suspected foods include dairy, soy, peanuts, corn, eggs and sugar.
Cut each out for about a week and bring it back slowly, noting how you feel. It works best with a dietitian, because the diet has to stay nutritionally complete while you test. Persistent stomach pain or bloating is a reason to see a doctor, because a new menu will not fix it.
Length: 1 week to start
2. Sugar Detox
A confession from our original writer: sweet things at any hour of the day. Cutting sugar is hard, and the original line still fits.
“Cutting out sugar can be very hard emotionally”
The case for it has solid backing. In 2015 the World Health Organization advised keeping free sugars below 10% of daily energy, and suggested going below 5% for extra benefit. Free sugars hide in ketchup, salad dressings and soups, so read labels. The rule is simple: eat anything, as long as it has no added sugar.
Length: as long as you like
1. Fruits and Vegetables Detox
This is the plan we would hand a friend. For two or three days you swap out eggs, dairy, meat and processed foods for fruit and vegetables, cooked or raw, with spices instead of salt, butter or oil.
Pick vegetables and legumes that carry protein, such as beans, lentils, mushrooms and spinach, so you are not running on fumes. We rank it first because you still chew real food and the risk is low. The gain is a break from the usual routine, not a purge.
Length: 2 to 3 days
The ranking says it all: the less extreme the plan, the better it holds up.
FAQ
Do detox diets really remove toxins?
There is no good evidence that they do. Your liver and kidneys already filter your blood, and health bodies describe commercial detox plans as a marketing idea.
Which detox diet is safest?
The fruits and vegetables plan is the lowest-risk of the five because you still eat whole foods. Juice-only cleanses carry the most reported risks, including dizziness and dehydration.
Will a detox help me lose weight before summer?
You may lose some weight from the calorie cut, but it tends to return when normal eating resumes. Steady eating changes beat a short purge.
How long should a sugar detox last?
There is no fixed length. The World Health Organization advised in 2015 keeping free sugars below 10% of daily energy, and below 5% for extra benefit, so many people treat it as a permanent habit.
Should I see a doctor before a detox?
Yes if you have diabetes, low blood sugar or any medical condition, or if you get lasting stomach pain or bloating. A dietitian is the right guide for an elimination diet.
How we put this list together
We ranked the five plans by weighing what health bodies and dietitians say about each: how much real food it keeps, how long it runs and what risks have been reported. The ranking is our editorial judgment, not medical advice.
Last updated: October 2026.
