"The whole purpose is to give people control and ownership and a place for these foods in our life," Alpert said. But there is one kind of sustainable detox that is worthwhile, according to some experts. Reducing sugar in your diet can help you drop pounds, improve your health and even give you more radiant skin. The urinary level of mercapturic acids indicates quantitatively the degree of activity or capability of phase II detoxification. Mercapturic acids are the final excretory products of detoxification and include a variety of functionalized xenobiotics that have been conjugated with glutathione or L-cysteine prior to excretion. Low levels of mercapturic acids are consistent with insufficient levels of glutathione and/or cysteine. When the rate of formation of functionalized xenobiotics exceeds the capacity of phase II detoxification, more potent toxins accumulate.