Making the world better, one answer at a time. Previously oysters were thought to contain high amounts of cholesterol but now, since new methods of calculating cholesterol levels are more accurate, oysters have been removed from the restricted list. Oysters are naturally low in fat, sodium, and calories.he National Heart and Lung Institute suggest oysters as an ideal food for inclusion in low-cholesterol diets. Oysters are an excellent source of vitamins A, B1(thiamin), B2 (riboflavin), B3 (niacin), C (ascorbic acid) and D (calciferol).