writes:

The question that was posed to me was:
"Does it take MORE energy to break-down certain
foods vs. others? There are only three answers:
yes, no, or the same.

The answer is no.

If celery or apples, etc. make you "feel" full, and at the same
time provide only a minimal net calorie gain, then is this not
a good supplement to a balanced diet?

They may or may not do that, but that does not make them
"negative-calorie foods."

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