After periods of festive indulgence, many people consider detox diets — such as juice cleanses or highly restrictive eating plans — in an attempt to “cleanse” the body. However, there is little scientific evidence that these approaches effectively eliminate toxins or lead to sustainable weight control.
The term “toxins” itself is often used vaguely in detox marketing. While potentially harmful substances do exist in our environment, the human body is already equipped with highly efficient systems designed to neutralise and remove them naturally.
Below are evidence-based ways to support these natural detoxification processes.
Increase your fibre intake
Most people consume far less fibre than recommended. In the United States, 97% of men and 90% of women fail to meet daily fibre targets, with average intake being less than half of what is advised.
Fibre plays a vital role in overall health. It helps reduce inflammation, strengthens the immune system, and influences brain function, mood, and cognition. Research has also linked adequate fibre intake to lower risks of cardiovascular disease, type 2 diabetes, colon cancer, and chronic inflammation.
One way fibre supports detoxification is by increasing stool bulk and softness, speeding up bowel transit and reducing the amount of time harmful substances remain in contact with the intestinal lining.
Studies show that fibre can bind to toxins and assist in their removal from the body. A 2015 study found that certain fibres bind toxic ions such as lead, arsenic, and copper, aiding their excretion. Fibre also helps eliminate bile acids, lowering cholesterol levels and reducing cardiovascular risk.
Some fibres may directly enhance the detoxification of carcinogens and inhibit cancer cell growth, although this area of research is still in its early stages.
Emerging research also suggests that fibre may help reduce levels of “forever chemicals” (PFAS) — persistent synthetic compounds that accumulate in the body — though current evidence is based on small-scale human and animal studies.
Fibre additionally supports liver and kidney health by promoting beneficial gut bacteria and protecting these organs from harmful microbes.
Fibre-rich foods include dried fruits such as apricots, leafy greens like spinach, legumes including chickpeas, lentils, and beans, as well as oats, wholegrain bread, and wholewheat pasta. Apples, berries, nuts, seeds, popcorn, and roasted pulses make excellent fibre-rich snacks. Variety is important, as different fibres provide different benefits.
Drink enough water
Water is essential for removing waste products through the kidneys and liver. The kidneys rely on water to flush out substances such as sodium and urea. Dehydration allows waste to accumulate and, over time, can impair kidney function.
A review of 18 randomised controlled trials found that higher water intake reduces the risk of kidney stones and supports long-term kidney health.
The common advice to drink eight glasses of water a day is outdated. For most people, 1.5–1.8 litres of fluid daily is sufficient. This includes water, lower-fat milk, and sugar-free drinks such as tea and coffee.
Support lung health
Products claiming to “cleanse” the lungs quickly have become increasingly popular, but the American Lung Association warns that such remedies lack scientific evidence and may even be harmful.
The most effective way to support the lungs’ natural self-cleaning ability is to avoid pollutants. Quitting smoking or vaping is the single most important step, along with avoiding exposure to secondhand smoke.
Keeping indoor air clean is also recommended. This includes avoiding cleaning products and air fresheners containing volatile organic compounds, limiting candles and gas appliances, and using HEPA-filter vacuum cleaners to reduce dust and allergens.
Cardiovascular exercise improves lung health by reducing airway inflammation and strengthening breathing muscles. Activities that train breathing directly, such as playing wind instruments, can also be beneficial.
Prioritise quality sleep
During sleep, the brain undergoes a powerful cleansing process. Cerebrospinal fluid flows through spaces between brain cells, removing waste products, including beta-amyloid proteins linked to Alzheimer’s disease.
Research suggests that this fluid movement intensifies during different sleep stages, with brief awakenings during light sleep triggering surges that wash waste across multiple brain regions.
Sleep deprivation has been shown to impair the blood-brain barrier and reduce the brain’s ability to clear potentially neurotoxic by-products. Even modest sleep loss — less than the average need of around seven hours — can negatively affect cognitive performance.
Stay physically active
Exercise supports detoxification not through sweating, but by increasing blood flow to the liver and kidneys, allowing them to filter waste more efficiently. Sweat itself is primarily composed of water and serves to regulate body temperature.
Excess body fat impairs liver function. Research shows that both aerobic and resistance training reduce liver fat in people with non-alcoholic fatty liver disease. Long-term high-intensity interval training has also been shown to slow age-related decline in kidney function.
Brisk walking, swimming, cycling, gardening, housework, and choosing stairs over lifts all contribute to better organ health.
Experts emphasise that long-term habits matter more than short-term detox efforts. Sustained healthy behaviours — such as moderate alcohol consumption year-round and adherence to a Mediterranean-style diet — offer far greater health benefits than temporary cleanses.
Source: BBC Health & Science