The recommended serving size of meat is 3 ounces (85 grams) — the average restaurant steak is more than four times larger. 60 percent of chefs in the United States say they serve steaks that are 12 ounces (340 grams) or larger.More Super-sized Facts:he recommended serving size of meat is 3 ounces (85 grams) — the average restaurant steak is more than four times larger. 60 percent of chefs in the United States say they serve steaks that are 12 ounces (340 grams) or larger. More Super-sized Facts: