Punctuation in compound complex sentence

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I don't understand the incompatibility of hunger and darkness.
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Yes, it is a horrible example. But I am merely using it as such.

I wwould just like to know if the two dependent clauses need to be separated by a comma. I will try give a better example for you:

Although I am overwieght and on a diet, when I walked home, I searched the fridge, so I could satiate myself.

Does there always need to be a comma between the two subord

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Actually, that is a much better example both structurally and semantically, because the conditions (overweight, on a diet) are obviously independent of walking home, where in your first example, the darkness and the walking can have an interdependence. This is how I would punctuate both (with the intentions of semantic clarity and sentence cohesion):

Although it was dark when

Thanks a lot. When I decide whether a comma is neccessary, I have generally not taken into consideration whether the clauses are interdependent or not.

Although I am overweight and on a diet, when I walked home, I searched the fridge so I could satiate myself.

I assume that the comma is neccessary between the two subordinate clauses for the following

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It must be personal preference

Except when you're working for a publishing company. I vary with the perceived dependence of the main clause on the result clause.
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I'd much appreciate a reply to this as these two questions have always troubled me.

Oh really. So you, personally, base it on the dependence of the subordinate clause for the independent clause. I assume you mean the comma is used when they are independent.

Are there any websites that talk about punctuation between

Although it was dark when I went home, I was hungry so I searched the fridge for food.