Thank you very much for writing.
We have written two commentaries on the Genesis 9 passage. Please take a
look at:
http://www.all-creatures.org/discuss/svtgen8.20-22-flh.html
and
http://www.all-creatures.org/discuss/gen9.1-4-flh.html
The other major thing that we have to remember is the fact that God sees the intent of our heart. When we consume animal products, we are condoning the mistreatment of animals, and are indifferent to their suffering, which hardens our heart and is exactly opposite of what God desires.
To see how this applies to God's blessings, please take a look at the Beatitudes in Matthew 5:3-12, for it tells us how God's blessings come to people with soft and caring hearts.
Even though God granted the concession to eat animals is also comes with the curse of degenerating diseases, which vegans seldom get.
If you would like we can go into this further.
We look forward to hearing back from you.
In the Love of the Lord,
Frank and Mary