The parmanus (atoms) in food carry vibrations of the person who has made the food. And it affects the person who eats it.
Our mind becomes like the food we eat. The parmanus in the food come from the intention with which it is made. If the person preparing the food has violent, harmful thoughts and if we eat that food, then those violent thoughts will influence our mind. In the same way the food which is made with the intention of the salvation of humankind, will alter the ‘parmanus’ of the person who partakes that food.
That is the reason why Prasad (vegetarian food cooked for temple devotees) is distributed to all devotees in temples. Prasad is not made to satisfy hunger or for good taste, but is made with the intention of the salvation of humankind. So never forget to have your Prasad when you visit temples!