INTRODUCTION
 
  In this developed world of broad spectrum 
  antibiotics there are less morbidity and 
  mortality due to infectious diseases.
               BUT
 
  Life style diseases are making many serious 
  challenges to  healthcare authorities 
  worldwide. From the 1940s, it became 
  progressively more evident that lifestyle 
  diseases were in the ascendancy.
         What are life style diseases?
  Lifestyle diseases are ailments the  onset 
   and  progress  of  these  are  primarily 
   concerned  with  lifestyle  and  behavior 
   factors such as dietary habits, physical 
   activities,     rest,    smoking,       alcohol 
   consumption, etc.
 Major Lifestyle Diseases 
 
  Cardiovascular diseases - Ischaemic heart 
  disease , Stroke , Peripheral arterial disease
 
  Metabolic disorders-  Obesity, 
  Hyperlipidaemia and Type 2 Diabetes
 
  Chronic respiratory diseases - Chronic 
  obstructive pulmonary disease (COPD) and 
  Asthma are the two main types of CRDs 
 
  Cancer 
 
  Other diseases associated with smoking and 
  alcohol and drug abuse
                 Etiology
  
   It is believed through various studies that free 
   radicals are taking major part of the formation of 
   lifestyle disorders. 
  
   Free radicals can be formed from both, endogenous 
   and exogenous substances due to unhealthy lifestyle. 
  
   Free radicals cause lifestyle diseases such as cancer, 
   cardiovascular diseases, arthritis, atherosclerosis, 
   hypertension, etc. 
  
   In recent years, a multitude of studies provide 
   comprehensive evidence that increased production 
   of reactive oxygen species are involved in the 
   development and progression of lifestyle diseases.
       Characteristics of lifestyle 
                     diseases
  
    Complex etiology
  
    The  onset  of  these  diseases  is  insidious, 
   they    take   years   to  develop  and  once 
   encountered do not lend themselves easily to 
   cure
  
    Multiple risk factors: There are a number of 
   risk  factors  that  can  be  divided  into  two 
   primary risk  sets:  modifiable  behavioural  risk 
   factors and non-modifiable risk factors, many of 
   which are common for a number of diseases.
  
    Functional impairment or disability