There could be impurities in your food that can be harmful to your health.
Everyday atta is often soiled with sand and dust. [1]
Groundnut oil is adulterated with low quality ones like soybean oil, palm olein, cottonseed oil etc. [2]
Chalk powder and washing soda is often used as a common adulterant in sugar. [3]
Tur dal is often adulterated with Kesari dal and colored with metanil yellow. [4]
There's no adulteration, throughout the process of delivering food to you.