The OP did come back and post that she had 5 minutes to eat at the end of her detention period so I assumed you were referring to that. I still disagree that missing a lunch as punishment is abuse. There have been times where my kids have missed dinner as punishment. Missing a meal one day, even everyday is not abuse, not even close.
ETA I also think that your statement bolded below really just makes light of what abuse truly is, its not about witholding things that would make one's life uncomfortable.
In fact, I believe it's one of the legal definitions. Withholding of anything needed to sustain a comfortable life.
This is what abuse is
"Any recent act or failure to act on the part of a parent or caretaker, which results in death, serious physical or emotional harm, sexual abuse, or exploitation, or an act or failure to act which presents an imminent risk of serious harm"
http://www.childwelfare.gov/systemwide/laws_policies/statutes/define.cfm