plz give me a scientific reasons
Doesnt always..however if you eat a high fat, high carb diet, the fats are mostly converted to low density lipids and unused carbs are converted to fat…this is because of the chemistry involved in reduction, oxidation, and digestion. The high density lipids wont break down as much because of the chemical reaction involved.
The HDL will actually make your arterial walls too "slippery" for the fats and cholesterol is bind. Thats why Fish oil, Flaxseed oil, olive oil are better for you that butter, hamburger, and fried foods.