What number of cups per day would you consider ‘moderation’? Right now, he drinks a couple of cans of Diet Coke for his caffeine boost, and even though the Green Tea doesn’t have as much caffeine, it does have some, so he was looking to replace the Coke with the tea. Would 3 or 4 cups a day be too much?
Honestly, for me, because my thyroid is super sensitive to things like that, moderation for me would be a couple times a week. In practice, I’ll have a cuppa ti (as they say in ol’ Alba) once in a blue moon. I avoid soy for the same reasons. But lots (most??) of folks have no problems whatsoever. I’m pretty sure there are “low fluoride” teas on the market, but I’ve never had any.