Do juice cleanses and "detoxes" actually remove toxins from your body?
No — there's no evidence any juice cleanse removes toxins your liver and kidneys weren't already clearing on their own. The scale drop is water, stored glycogen, and emptied gut contents, not fat or poison leaving your body.
The idea behind a “cleanse” assumes your body is walking around loaded with toxins that build up until a green juice flushes them out. That’s not how physiology works. Your liver runs a three-stage biotransformation assembly line around the clock — tagging fat-soluble compounds, converting them to water-soluble ones, then shipping them out through bile or urine — while your kidneys filter roughly 150 quarts of blood a day, recycling nearly all of it back into circulation. There’s no idle switch waiting for pressed celery juice to flip on.
So researchers have gone looking for proof anyway. A 2015 critical review scoured the literature for a single controlled trial showing a commercial detox diet measurably speeds toxin clearance in humans, and found none. A 2026 mini-review of diet and detox teas screened 1,708 studies and kept just 10 worth counting; none demonstrated a real detoxification effect, and several instead documented liver injury, dangerous electrolyte swings, or undeclared stimulant drugs hiding in the product. A decade of looking, across two separate reviews, and nobody has found the toxin a cleanse actually clears.
Where the weight actually goes
A three-day juice fast can drop the scale a few pounds fast, but the arithmetic behind it is boring. Cutting carbs burns through roughly 500 grams of stored glycogen, and each gram is bound to three or four grams of water — that’s a liter or more of water weight gone before you’ve lost a gram of fat, and it comes right back once you eat normally again. Skip solid food for three days and you also empty your gut contents, which shows up on the scale as “progress.”
What a cleanse actually costs you
Juicing strips out the pulp, which is where the fiber lives, and juice itself is close to protein-free. A 2025 trial that put people on a straight three-day juice diet found it didn’t just fail to help — it shifted gut and oral bacteria toward more inflammatory, permeability-linked species, likely a result of the fiber loss and sugar spike.
If you want to support the organs actually doing the work, the boring stuff wins: hydration, fiber, sleep, and easing up on the alcohol that actually taxes your liver. Save the juice for breakfast, not a “reset.”