Read what exactly - That study did not evaluate people doing LC WOE.

They are only speculating. Read it - they did not study an Atkins group.

How does serotonin production in a person doing Atkins maintenance compare to someone eating gobs of sugar?

I personally suffer from a mild form of SADD - I don't like it to be dark when you get up and dark when you get home and not have any daylight hours to do anything on my house. My diet hasn't changed a thing.

But read what? There are no LC studies on this subject.