According to Osho, meat-eating burdens the spirit with tamas—dullness, heaviness, and insensitivity—because it involves violence against highly sensitive life. Choosing taste over life coarsens awareness, blinds compassion, and makes one unfit for finer spiritual perception. Even carcass meat is 'stale' and tamasic, further clouding consciousness. Therefore deep religious sensitivity naturally moves toward vegetarianism.
Eating animals for taste makes your heart and mind dull and less kind, so it’s harder to grow spiritually.