I'm not advocating any particular diet here, but I would like to offer some "food" for "thought".
When you go to sleep at night, you experience a reality rife with symbols. This is a commonly accepted tenet of dreaming -- the idea that thoughts disguise or dress themselves in observable form. What is less commonly accepted, yet in my opinion is true, is that the waking reality we experience (aka the "real" world, *cough* *cough*) is also wholly composed of symbols as well. For example, colors are symbols. Shapes are symbols. Numbers are symbols. Words are symbols.
What if all tangible form is a symbol for an intangible thought?
Now, in regards to the ability to intentionally manifest. What is involved with this? When we utilize intent to create experience we are giving form to thought. It starts out as intangible and evolves to the point where it gains specificity. This is the point when the intangible crosses the threshold separating it from the tangible world. It then becomes a physical symbol for its more intangible aspect, or thought form.
So in light of this idea, you could consider all physical things -- including food -- as thought. And so, this begs the question:
What symbols are you ingesting? What thoughts are you symbolically taking into your being? Does it matter? Is there a racial, cultural, or universal hierarchy to these symbols? Does the consciousness of animal flesh have an adverse or beneficial effect on the consciousness of your body's flesh?
You tell me.