Groundnut oil or peanut oil is a monounsaturated fat, which means it has one double bounded carbon molecule–two adjacent carbons on the fatty acid chain bind to a single hydrogen. Though liquid at room temperature, monounsaturated fats may begin to solidify when chilled. By replacing saturated fats or trans fats with monounsaturated fats such as peanut oil, you will likely gain some health benefits.
Groundnut oil, as well as other monounsaturated fats, can help to lower your overall cholesterol level, lower the level of bad cholesterol in your blood and increase your level of good cholesterol. Low-density lipoprotein cholesterol, or LDL cholesterol, is considered bad because it may build up on the inner walls of your arteries. LDL combined with other substances can form plaque that narrows arteries and makes them less flexible. High-density lipoprotein cholesterol or HDL cholesterol, on the other hand, is good because it tends to carry cholesterol from arteries back to the liver, which removes it from the body, according to the American Heart Association.