In view of evolution, one would expect the fact of being hungry to be represented both chemically and in the language of thought. There are other uses besides communication for sentence-like forms. Very likely, the expectation of being hungry by dinner time needs something different from a substance in the blood for its representation. The language of thought is used for reasoning. Here are some reasons.
Much mental information is represented in parallel and is processed in parallel.
Reference to states of the senses and the body has to be done by something like pointers. Natural languages use descriptions, because one person can't give another a pointer to his visual cortex. We don't think in terms of long sentences. Much human thought is contiguous with the thought of the animals from which we evolved. For robots, logic is appropriate, but a robot internal language may also include pointers.