While their co-founder Ellen G White advocated a plant-based / vegetarian diet some Adventists eat ‘clean meats."
The biblical book of Leviticus outlines those meats that are considered clean and unclean. Clean meats are from any animal that has a cloven hoof with two toes and chews the cud. This means that one can eat cattle, buffalo, sheep, goat, deer, gazelle, and antelope, to name just a few.
More common types of clean meats include certain types of fish (those with fins and scales), chicken and turkey.