Thank you for the responses, very interesting.
I completely understand that veganism is really a philosophical approach to life; however I'm afraid it's not why people I know are trying it in all honesty. I can see that you can feel morally better.
I'm meeting people who claim they feel so much better physically.
However - actually, as I understand it, as a comment mentioned above, dairy can exacerbate quite a few things (certainly increases mucous according to a GP friend and eczema) too much meat can make you feel yuck (meat sweats!).
Also, as I mentioned, and one of the reasons for thinking about veganism, iron is best absorbed from food if not eaten near eggs and dairy. (I'm struggling with iron and an inability to take the tablets!)
And than you for the link above, which I'll read later, as I do think there are different foods people digest well or 'need'.
One serious concern I have about veganism is that iodine is primarily from animal sources and very important or women considering and during pregnancy, and (I'd like to be corrected on this one if possible) the fact that we need bees to desperately to pollinate crops that I feel honey should be eaten and the industry supported from an ethical POV.
Really though, I feel all things considered, it's about choosing local/ sustainable/ organic/ healthy food if you're considering health but possibly also welfare? Esp as seaweed fertilised veg might get your iodine in. (I don't know about specifics here!)
Or a bit of lava bread!