Fiber is the rubbish remover in the elimination system. Toxins can be absorbed back into the bloodstream without good 'ole fiber taking it all the way out. It's easy to increase your fiber intake. Check out these yummy foods that are high in fiber:
Lentils and Legumes of all kinds
Nuts and Seeds of all kinds including super fiber rich chia seeds
annnnnnnndd drum roll please.... dark chocolate!
I recommend checking out your dosha and eating right for your dosha. This is the art and science of Āyurveda. Check out Dr. Vasant Lad: https://www.ayurveda.com/