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I could never be vegan, nor do I ever want to be. After all, I was raised on prime, grass-fed and pastured Hereford beef from the time I started eating food. My grampa raised them and then when my Dad bought the farm from grampa in the early 1960's I was even more active in helping with the cattle and the bull breeding operation. I just could never be vegan or even vegetarian, no thank you.
Here's a good article about broccoli and zinc and making sure you get enough in your diet.