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This is much to do with their lifestyle.

I wonder whether "much" is used as an adverb modifying "to do" and whether the sentence sounds natural.

I guess so, but I'm not sure.

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fire1

This is much to do with their lifestyle.

I wonder whether "much" is used as an adverb modifying "to do" and whether the sentence sounds natural.

I guess so, but I'm not sure.

Yes. "much" is an adverb which modifies "to do". The sentence is not as natural as it could be. We generally say "has to do with". In comparison, "is to do with" is not used very often.

CJ