Grease is liquefied fat. You need the molecules and compounds in the fats to make nerves, connective tissue, and hormones.
The liver produces bile and the gallbladder stores bile. When you eat greasy foods your gall bladder releases vile into your stomach to break fats down into their base compounds.
If you eat too much fat the liver will turn it into glucose through a process called gluconeogenesis and you can either burn it or convert it into human fat for later use.
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