How many days can you be comfortably on just Junk Foods ?

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Here in India we get junk foods with lot of spices ! They are OK for a change ! There are various types of junk foods available in Market but I personally may be because of age and personal preference can't stay entirely on junk food for more than a day! I feel very uncomfortable and develop irritation in my stomach if I miss my staple food and try to replace the same with junk food ! How about you? Can you just stay with the junk food for days together by missing your staple food? will be highly pleased to know your experience! Thanks!