You can quit smoking if you smoke, avoid processed and outside foods. Eat home-cooked meals that are low in spices, salt and oil. Have lots of water. Do not eat foods that have been microwaved.
Eat foods rich in antioxidants- vitamins A, C and E. Have glutathione supplements after discussing with a nutritionist.
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For further help, we recommend checking with one of the
best nutritionists in Karachi and seek a piece of in-person advice at https://oladoc.com/pakistan/karachi/nutritionist