Diet by LDL 7. March 2012 William Davis (0) Conventional notions of heart healthy diets, such as that advocated by the American Heart Association, are largely based on observations of total and LDL cholesterol. So, cut the saturated fat in the diet, cut the overall fat content, and replace them with polyunsaturated oils like safflower, corn, and vegetable oils and increase consumption of whole grains and total and LDL cholesterol show a modest downturn. Thus, diets like the American Heart Association Total Lifestyle Change approach advocate limiting total fat to no more 25 to 35% of calories and saturated fat to no more than 7% of calories.