Three kilos in five days. The scale dropped every morning of the detox, and by day five it looked like proof that the cleanse had earned its price.
Almost all of it was water.
When you cut carbohydrates sharply — which every juice cleanse, master cleanse, and elimination protocol does — your body burns through its stored glycogen within days. Glycogen is the carbohydrate your muscles and liver keep on hand for quick energy, and every gram holds roughly three grams of water. Burn the glycogen, release the water, watch the scale fall two to three kilos before a single gram of fat has changed.
Eat normally again. The glycogen refills, the water follows, and the scale climbs right back. Not because the diet failed. Because the scale was tracking something the diet never touched.
Do Detox Diets Actually Work for Weight Loss?
Detox diets produce short-term weight loss through calorie restriction, not detoxification. The initial two to three kilos lost are water and glycogen from carbohydrate depletion, not fat — and they return when normal eating resumes. The body already detoxifies itself continuously through five organ systems. No controlled trial has ever demonstrated that detox diets improve weight management or toxin elimination.
— Naude et al. 2022 · Cochrane Database of Systematic Reviews · 61 RCTs, n=6,925 | Klein & Kiat 2015 · J Hum Nutr Diet
The largest comparison of diet types ever conducted — sixty-one studies tracking 6,925 people — found that what you eat makes virtually no difference to how much fat you lose. Low-carb, balanced, high-protein, restricted — when total calories were matched, the outcomes converged. The gap between diet types was roughly one kilo, and even that margin may have been water rather than fat.
Any eating pattern that creates a calorie deficit will produce fat loss. A detox diet that cuts your intake will lose fat — but so will a regular week where you simply ate a bit less. The mechanism underneath every diet’s result is the gap between energy in and energy out. The detox label adds nothing the deficit wasn’t already doing.
That handles the weight side. The other half of the promise — that detox diets flush toxins your body cannot handle alone — collapses from a completely different direction.
Your liver processes toxins continuously. Your kidneys filter blood around the clock. Your gastrointestinal system, your skin, your lungs — five organ systems run detoxification every hour of every day, whether you had a green juice or a cheeseburger for dinner. The biology was never paused, waiting for a cleanse to restart it.
The only scientific review to examine detox diets specifically found that not a single controlled trial has ever tested a commercial detox diet in humans. Zero. The conclusion: no compelling evidence supports detox diets for weight management or toxin elimination. The few studies that tried were small, uncontrolled, and methodologically thin.
0
Controlled human trials ever conducted on commercial detox diets
The honest gap: some individual compounds — coriander, certain seaweeds — show preliminary detoxification activity in animal models. No human evidence confirms those effects translate to a packaged cleanse you buy off a shelf. An entire industry sits inside the distance between “a molecule did something in a rat” and “this diet removes toxins from your body.”
The three kilos came back because they were always coming back — glycogen and the water bound to it, released on schedule, restored on schedule, no toxin anywhere in the equation. The only thing the cleanse was actually doing was cutting calories. That mechanism has been tested across thousands of people for decades. The result is the same every time, regardless of which diet takes the credit.