Question

what will happen of spoil food in consumed

Answer 1

Eating spoiled foods can cause food poisoning symptoms that include abdominal cramps, diarrhea, headache, nausea, vomiting and weakness. Foods such as potato salads containing mayonnaise and dairy products that have been out of the refrigerator for an extended period of time can develop bacteria, in turn causing illness after ingestion. Symptoms of food poisoning typically begin within 6 hours of ingestion.

Answer 2

if spoilt food is consumed by body there may be a reaction to pathogenic microbial contamination in the food causing classic food poisoning symptoms which can be more or less serious depending on which particular bacteria is involved.
the symptoms are often caused by metabolites from the bacteria and many of these are heat stable so just heating the food doesn't destroy them.