The Apostle Paul writes in the Epistle to the Colossians:
Therefore, if you died with Christ from the basic principles of the world, why, as though living in the world, do you subject yourselves to regulations— “Do not touch, do not taste, do not handle,” which all concern things which perish with the using—according to the commandments and doctrines of men? These things indeed have an appearance of wisdom in self-imposed religion, false humility, and neglect of the body,but are of no value against the indulgence of the flesh.
The way in which Christians are “not under the law” is one of those famous disputes in New Testament studies, but this passage seems to make at least one thing clear, you do not gain mastery over the flesh by adherence to regulations and restrictions concerning temporal things. Neither eating, nor not eating in itself has any bearing on your spirit.