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Whey always gave me digestive issues. I am also gluten free and use MRM Elite veggie protein off amazon and love it. Kimchee's cool but the fish oil/anchovies typically in it give me quite the rajasic reaction, as does any kind of flesh i eat so thus i let the animals live.
The natural sugar in yogurt is good for us. I buy full fat local no sugar added fresh yogurt, usually eat it as my last meal of the day with honey/fresh fruit.
Figuring out one's diet in connection to their lifestyle takes eons, be thankful you're aware and beginning to fix things now God bless.