Plants have a lifeplan to be eaten. They have a high vibrational energy. You can also use animal products like dairy. Eggs&meat however are corpses and embryos and that's what can lower your energy.
But what REALLY matters is your Love in your Heart and not lecturing others about dietary habits. You are not automatically going to hell for eating meat and you are not automatically transvibrating into the 5th dimension of Heaven when you eat an apple. Listen to your body and keep a healthy balance.