A diet rich in junk food is not conducive to maintaining a balanced diet.Junk food nevertheless remains popular because It's relatively cheap to manufacture,is convenient to consume and has a lot of flavor because of its typically high fat,sodium or sugar content.It's nutritional valve is typically very high in empty colories.Junk food alsomany contoun numerous food additives which are prevent spoilae.For this reason junk foods are also convenient in that they keep for long periods of time.