The third for is the most generous / 'sincere'
If you're the least bit hungry, there are plenty of eggs
I argue this is because it is the most deferrential. The deference comes from the additional words used. Those additional words denote attention or consideration on the part of the speaker.
Even if you speak that sentence with utter snide, it is still the more-gentle of the three versions of the sentence.
However, some people may consider the added word (i.e. consideration) to be excessive, which may make for another form of awkwardness. At minimum the third sentence is probably the 'most formal'. In a non-formal content a formal statement can be interpreted as a subtle form of insincerity.