Started SCD...then constipation

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Hello listmates

2 days ago (Dec 8) we started the SCD with our 5 yo son. He's been on

GFCFSoyFSugarFCornF diet for almost 1 year, the only offending foods

he still ate until recently were potato, rice, and rice flour.

We removed potato about 1 week ago, no problem, then on Dec 8 we

removed rice/rice flour as well, and started to give him

panckae/muffin etc made from walnut flour (can't eat almond nuts since

phenol sensitivity).

He immediately developed constipation (he used to have BM once a day),

complaining tummy pain, no appetite, trying to throw up. Also he tends

to sleep much more than usual, appears less energetic. (BTW: we also

give him HNI’s Zyme Prime and NO-FENOL).

Could those symptoms caused by: 1) the inability to digest the walnut?

or: 2) they are actually yeast die off? , or 3) they are bacteria

die-off?

We had a Organic acid test and returned nothing abnormal.

Thanks for your feedback, appreciate!

YL