Is it fine to eat one meal a day? (Soda,fries, sandwich) other foods in description

Or just a couple slices of pizza, or Carne Asada Fries w/ a soda, or something like that. Should I be eating more?🤔 I usually eat once a day and sometimes not that often though I’ll eat a snack aswell like Nutrigrain bar, chips, cereal, candy bar.

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