Fats are lipid substances. There are a variety of oilseeds; the following is a commentary of some of them. Soy is a legume produced primarily from the areas. It owns all eight amino acids essential for human health. Cottonseed used to produce oil, animal feed components, and other industrial and consumer products would be the seed of the cotton plant. The oil is extracted using a solvent extraction method in the kernel. The US is among the world's top producers, along with Pakistan, India and China. Peanuts are legumes high in protein, oil and fiber. Peanuts are largely used in food products, but more than half of the world's production of peanuts have been crushed for peanut oil. The oil from the seeds of the sunflower contains more vitamin E. Therefore sunflower oil is used in food products. The US is a big producer of sunflowers, but they are also grown as crops. The oils are extracted from the various oilseeds from the process of an oil press or an oil screw press. An oil seed press operates by putting the seeds under increasing pressure while being conveyed through a tapered chamber. Because of the compression and the temperature generated by the seed oil press procedure, oil is expelled, while the solid material is shunted away. A process known as transesterification is oils and fats are converted to biodiesel. Biodiesel is a methyl ester-based fuel made from oil or fat. It's a renewable fuel that can be used with no modification or very little in diesel engines. Alcohol is combined with a catalyst that breaks the material into the methyl esters, also referred to as biodiesel, and glycerin a biodiesel co-product. The advantages of biodiesel over petroleum gas are several. The most obvious benefit is that it is derived from renewable sources, unlike the ever-depleting oil of the Earth. Biodiesel is non-toxic and biodegradable. It burns cleaner, with research showing the combustion of biodiesel emitting 40-60 percent less greenhouse gas than petroleum diesel. Adding biodiesel to petroleum diesel reduces the wear on engine parts, prolonging their life because the component makes the fuel more pliable. The biodiesel industry isn't as established in the US as in Europe. But growing interest in non-fossil fuels is forcing both businesses and individuals to produce biodiesel fuel, with the consequence of rapidly increasing production. No matter what the oilseed crop, it can't be turned into bio gas without first extracting the oil from the seeds. This is done by using high-pressure presses. These presses can be driven or can be a screw press. The canola seed is placed in the press. The compression process squeezes the oil from the seed. An assortment of sizes and styles of oilseed presses are available. The start of bio diesel starts at the farm. Research is revealing crops like canola is proving to be the best choice regarding accessibility and return to produce the alternative energy supply.