Update - I found this fascinating.
For months now, I have been googling 'brassica cravings' in an effort to discover why I am DESPERATE to eat raw broccoli stalks, raw kale, as much cauliflower as I can fit in, and raw sprouts (which I peel on the day I buy them - in bulk - and keep them in poly bags in the fridge, so they're an instant snack).
The results of my Googlings had only ever come up with stonkingly unhelpful things like 'Craving crisps? Eat celery!'.
On my way to bed last night I was hungry and cravy (which interestingly just autocorrected to 'crazy' - oh so true right now), so grabbed a couple of sprouts, and as I munched on them (they were amaaaaaazing) I remembered a conversation I'd had a while ago with a friend who has subclinical hypothyroid, when she was telling me that she'd heard that broccoli was a thyroid suppressant, so she was choosing to not eat it very often.
OMG. What if, I thought (mid-sprout), my body is crying out for brassicas BECAUSE my hyperthyroid body is desperate for my thyroid activity to BE suppressed?!
So I Googled 'thyroid and brassica vegetables', and got this:
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Q: I read an Op Ed piece in the NY Times recently in which the writer stated that a doctor had told her that eating kale, cabbage, Brussels sprouts and broccoli was not a healthy choice for anyone with hypothyroidism. I have hypothroidism, but have never heard this. I tend to eat a fair amount of all vegetables, including those listed. Is it safe to continue?
A: These vegetables are from the plant genus Brassica, which are known to be goitrogenic. A goitrogen is a thyroid antagonist found in food. Besides the vegetables you mention, also included in the Brassica family are turnips, rutabaga, watercress, kohlrabi and cauliflower.
As someone with hypothyroidism, should you avoid these vegetables completely? No. Make sure to eat most of these vegetables cooked, rather than in their raw state and don’t eat them every day. Always eat a variety of produce.
(taken from here:
http://drhoffman.com/article/ask-leyla-brassica-vegetables-and-hypothyroidism/)
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It'll be interesting to see if I'm still desperately seeking brassicas once my T4 has gone down and I'm back in normal land again. Certainly I'll be looking out for unreasonable broccoli behaviour in the future, which might with luck warn me that I'm on the way back to hyperthyroid mania BEFORE I get there next time!
Or maybe I just really, really, really love the raw sprouts and broccoli! Each to their own....
