All these thoughts of sin merit food habits etc are not very important. If your attention is on the Lord then nothing will ever bother you. In His vision there is nothing wrong. Or else the massive earthquake in January 2001 at Gujarat will create sin for the Lord for killing so many human beings. Jivo jivasya jeevanam is the mantra in our scriptures.
Life is sustained on life alone and in the totality everything is equal.
No it does not matter if you eat non-vegetarian or vegetarian food only. Don't have any think against it. What is more important is you don't force your views on other about the eating the non-vegetarian food. You eat if you please but don't force others about it. It will hamper your own spiritual progress.