As common a vegetable as cucumber is, it is one of nature’s most powerful detoxifiers. It’s been in use in Chinese medicine for centuries. Rich in vitamin E, it helps slow the effects of aging on the skin. In traditional Chinese medicine, cucumber is also prescribed for anxiety and insomnia. If you don’t feel like picking up a cucumber when your need refreshment, try the cucumber-kale smoothie. Along with the cucumber, throw in apple, celery, lemon and kale in the blender.