Atkins and mental energy/depression

Hi you all!

I started Atkins in February and got great results. I gained tremendous energy both physical and mental, lost 30 pounds. After a few months I noticed I didn't have the same mental energy in particular. Instead of being able to ad lib on anything and everything now the words and direction just simply are not there. Yes, I am still functional but I miss that high mental energy, has anyone else experienced this, is there anyway to get it back?

A doctor told me it was because of ketosis. Actually I eat pretty much the same. can you stay in ketosis constantly?

any help greatly appreciated,

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