First, a 24 hrs fast. Begin and end your day with a hot water with lemon.
Next, spend a week only eating fruits, vegetables, seeds, and legumes. Go organic where possible. Spend a few hours walking and getting sunlight.
For the 2nd week, fast with water, melons, grapes, artichoke. If you can, take off work and spend the week at home resting. Partake in a lymphatic massage, epsom salt bath, and deep exfoliation. Try to have a full body sweat a couple times, if a sauna or outside space is available--but stay hydrated. Be sure to take electrolytes as needed, 3g sodium, 3g potassium, 0.3g magnesium at the minimum. You probably have these at home or at the local store as table salt, baking soda, lite-salt, no-salt, epsom salt... magnesium comes in pills that are fine to supplement year-round.
For the third week, slowly add seeds and legumes and all fruits and vegetables back to your diet. Continue walking and sweating multiple times a week.
You may add back meats and egg towards the end of the 3rd week, or wait til the 4th. Try to avoid all processed foods to keep your progress, be sure to always stay hydrated as water is the main source of internal cleansing. Enjoy your new palate and gut!