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Eating unhealthy food will not cause you to get a cold. Viruses cause people to get a cold.
The common cold is caused by a virus passed from person to person. This rhinovirus is the virus that causes the common cold.
If as a result of the cold a person has breathing dificultys yes.
Eating unhealthy food cannot make you or anyone feel cold
You won't get cold sores from kissing a dead person.