Fruits and Vegetables adulteration, How can we protect ourselves from consuming poison and how can it be controlled?

From fruits to vegetables, from milk to cold drinks, from ghee to edible oils, from wheat atta to common dal, from spices to sweets, the chances are that you are consuming ‘poison.’ Almost every eatable that you buy from the market is probably adulterated.
Food has now become your enemy. The juicy mango is no longer your favourite fruit. It has been ripened with calcium carbide, the same chemical that is used in making crackers and cheap bombs.

For several generations in your family you have the habit of drinking a glass of milk before you hit the bed. You always thought that it was your primary source of daily intake of nutrition. But for years now, you have read that the milk you drink is most likely contaminated with its synthetic variant — a cocktail of urea, detergents and cheap edible oil. Yesterday i saw on a news channel that Oxytocin is injected in watermelons to increase their size. 

The doctors, nutritionists and everybody advise us to eat green vegetables and fruit for good health but how safe are we by eating them and how can we protect ourselves from this menace