Plant substances in
corn,
wheat,
oats,
rye,
olives,
wood
some other plants that are similar in structure to cholesterol but not absorbed by the body, can decrease cholesterol absorption.

"Stanols" and "Sterols"

Explanation:

Plants Stanols and Sterols are collectively called as “phytosterols”.

Plants stanols and sterols are natural substances that are found in food and in plants, vegetables and vegetable oils, seeds, nuts, wheat brans, etc.

These stanols and sterols are similar to cholesterol in structure but they are different in the sense that stanols are saturated while sterols are not saturated compounds.

Stanols and Sterols are safe to the body and it help in lowering the cholesterol level in the body.

Thus the answer is "Stanols" and "Sterols".