Detox teas, juice cleanses, lactic acid flushes—the idea that we need to purge toxins from our bodies is everywhere. Some of these so-called toxins come from what we eat or drink, others from the environment, and the solutions are often marketed as quick fixes. But do we really need to flush anything out? And more importantly, could these methods do more harm than good? Your body already has a built-in system for handling waste, and trying to override it can put unnecessary stress on both your health and your running. Here’s what you need to know.
What happens to the stuff your body doesn’t need?
The body has a built-in system for clearing out what it doesn’t use, and the liver, kidneys, lungs and digestive system all play a part. The liver breaks down drugs, alcohol and other chemicals so they can be excreted, while the kidneys filter waste into urine. Even your lungs help by exhaling carbon dioxide. Most of what you eat, drink and breathe gets processed quietly by these systems, without any need for a “detox.”
Here’s a sweat rate calculator to help you master your hydration game
Do you sweat out toxins?
Very little. Sweat is mostly water, with small amounts of salt, urea and trace minerals. While it may contain tiny amounts of certain compounds, it’s not how your body “detoxes.” That job belongs mostly to your liver and kidneys. Sugar is processed mainly by the liver and stored or burned. Alcohol? Your liver does the work there, too.
What happens to lactic acid, anyway?
It doesn’t “build up” and hang around like people think. Lactic acid (or more accurately, lactate) is cleared by your body quickly, often used by the heart and muscles as fuel. Studies show most of it is gone within an hour of exercise.
Can “flushing” toxins actually be dangerous?
Yes, especially if it involves extreme methods like fasting, juicing or overhydration. These can stress your organs, cause imbalances and make you feel worse, not better. Your body doesn’t need to be “flushed” when it’s working fine.
How can I help my body do its job?
Sleep, hydration, balanced nutrition and regular movement—that’s it. You’re supporting your natural systems, not overriding them, and that’s the smartest way to stay healthy long-term.
