Detox juice cleanses remove toxins

What we know

Commercial detox juice cleanses are marketed on the premise that the body accumulates harmful "toxins" from food, environment, or lifestyle that need to be actively flushed out through a period of restricted juice consumption, typically over three to ten days. This premise does not match how the human body actually processes waste and foreign substances. The liver and kidneys are dedicated organs that continuously filter the blood, metabolize and neutralize a wide range of compounds, and excrete waste products through urine and bile, functioning at all times in a person with normal organ health, not only during a designated cleanse period.

A widely cited 2015 review published in the Journal of Human Nutrition and Dietetics examined the existing clinical evidence for commercial detox diets and found no compelling evidence to support the use of these products for weight management or toxin elimination, concluding that human biology already includes highly evolved and functional detoxification systems that operate continuously. No juice cleanse product marketed to consumers has identified and measured a specific toxin, provided evidence that the toxin accumulates harmfully in healthy people, and then demonstrated that its product measurably reduces that toxin's level beyond what normal liver and kidney function already achieves.

Juice cleanses can also carry genuine health risks. Because most juice cleanses eliminate whole food fiber, protein, and fat while providing large amounts of concentrated fruit sugar, they can cause significant blood sugar spikes and subsequent crashes, are not appropriate for people with diabetes, and provide insufficient protein and calories for sustained energy needs even over a period of a few days. The National Kidney Foundation and various nephrology case reports have documented instances of kidney injury linked specifically to extreme or high-oxalate juice cleanses, particularly those relying heavily on certain leafy greens like spinach that are high in oxalates, a compound that can contribute to kidney stone formation or acute kidney injury when consumed in unusually large concentrated amounts over a short period.

Any short-term weight loss commonly reported after a juice cleanse is attributable mainly to a substantial reduction in overall calorie intake and temporary water and glycogen loss rather than to toxin removal, and this weight is typically regained once normal eating resumes. Registered dietitians and major health organizations, including Harvard's School of Public Health, note that a healthy, varied diet rich in fiber, along with adequate hydration and normal organ function, already provides all the support a healthy body needs to process and eliminate waste products, and that no controlled scientific study has demonstrated that any commercial cleanse product improves on this baseline biological process. The word toxin itself is rarely defined precisely in cleanse marketing, since a specific, measurable, and named harmful compound is almost never identified, which makes the underlying claim difficult to test directly and easy to apply broadly to justify almost any product; genuine documented toxic exposures, such as heavy metal poisoning or specific drug overdoses, are instead treated through established medical protocols like chelation therapy or dialysis under clinical supervision, not through juice consumption.

Common claims

• Juice cleanses remove toxins from the bodyNot supported, the liver and kidneys already perform this function continuously
• Detox diets help with sustainable weight lossNot supported, weight lost is mostly water and glycogen and is typically regained
• Juice cleanses are risk-freeFalse, documented risks include blood sugar spikes, nutrient deficiency, and in some cases kidney injury

Evidence hierarchy

All sources

• Detox diets for toxin elimination and weight managementJournal of Human Nutrition and Dietetics (PubMed) · 2015
• The Truth About Detoxes and CleansesHarvard T.H. Chan School of Public Health · 2016
• National Kidney FoundationNational Kidney Foundation · 2023
• 'Detoxes' and 'Cleanses': What You Need To KnowNational Center for Complementary and Integrative Health (NIH) · 2023

Related terms