Our diet has changed dramatically.Because big companies (for example Mc Donalds,Brger King etc...) spreaded everywhere and we addicted them a lot.In addition ,people start to buy frozen foods instead of to make them own.Because frozen foods are fast and practical meals.But while we are seeking easy way for nutrition,we forgot most important thing.This thing was health.Therefore,the world became unhelthy world.As a result,changing diet didn't avail us.