I am trying to say "You will not feel good if you eat such food" and this has been my attempt so far:
How can I express "will not" in this case? Also, any corrections in general are very much appreciated.
Tenses generally do not correspond well between English and Japanese. Japanese-speakers usually just use the present tense to talk about near future events and we could always tell from the context.
Natural-sounding Japanese sentences for "You will not feel good if you eat such food." would be:
As usual, one could not arrive at a natural-sounding phrase if one TRANSLATED from another language. If you find my English understadable, that is because I am not translating from Japanese.