"a real food" is wrong since "food" is uncountable in this case. These are both possible: I can't handle the juicing diet; I need to eat real food. I can't handle the juicing diet; I need real food to eat.
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AnonymousSo after your revision they are now correctly punctuated?Yes. However, many people would probably not notice an error in the originals. In cases like yours, where the two clauses are contrasting, what is technically a comma splice often does not appear like a glaring error.
Anonymous I need real food to eat, sounds wrong
AnonymousThank you. What about if I used a full-stop instead: I can't handle the juicing diet. I need to eat real food.Would that be error free as well?Yes, you can use a full stop, a semicolon, or a dash.