Poor detoxification describes reduced efficiency in the body’s normal metabolic processing and elimination of compounds through phase II conjugation pathways. Phase II detoxification is not a vague cleansing process; it is a defined biochemical system that attaches water-soluble groups to compounds so they can be moved through bile, urine, and stool. These pathways include glucuronidation, sulfation, glutathione conjugation, acetylation, methylation, and amino acid conjugation. The liver is the primary organ involved, but the intestine, kidneys, immune system, gut microbiome, and bile-flow systems also influence how well processed compounds leave the body. Phase II activity depends on adequate amino acid availability, sulfur chemistry, minerals, vitamins, antioxidant capacity, bile acid movement, fiber-supported stool clearance, and reduced exposure to toxin-heavy foods. When this system is under strain, the biological pattern may include oxidative stress, reduced glutathione recycling, weak bile acid turnover, altered gut-liver signaling, impaired methylation balance, low sulfur compound intake, poor fiber intake, and increased inflammatory signaling. A whole-food plant-based pattern supports this system by reducing the burden from oils, meat, dairy, alcohol, refined sugars, fried foods, and ultra-processed ingredients while increasing fiber, phytochemicals, minerals, and antioxidant nutrients from intact plants. A Plant-based Nutrition approach emphasizes cruciferous vegetables, legumes, whole grains, fruits, seeds, nuts, herbs, spices, and unsweetened tea. Broccoli, kale, cabbage, Brussels sprouts, garlic, onion, turmeric, ginger, green tea, oats, brown rice, quinoa, black beans, lentils, chickpeas, apple, lemon, beetroot, carrot, sweet potato, spinach, flax seeds, chia seeds, walnuts, parsley, and cilantro provide the chemistry most relevant to phase II support. Cruciferous vegetables provide glucoraphanin, sulforaphane-related compounds, indole-3-carbinol, glucobrassicin, vitamin C, folate, and vitamin K1. Garlic and onion provide allicin-related sulfur compounds. Turmeric provides curcumin, ginger provides gingerols, and green tea provides EGCG and catechins. Oats, legumes, apple, flax seeds, and chia seeds support bile acid binding, fecal elimination, microbiome fermentation, and short-chain fatty acid signaling. The support pattern focuses on glutathione defense, Nrf2 antioxidant response, detoxification phase II activity, bile acid synthesis, gut microbiome signaling, methylation balance, transsulfuration, one-carbon metabolism, epithelial barrier integrity, and steady metabolic energy production. The goal is to support normal biological processing through food chemistry, not stimulate or force detoxification.