Saturated fatty acids
Many times we have heard about the fat and we have a notion that not all fats are equal. We know that there are different types, such as trans fatty acids omega-3 and 6, monounsaturated and saturated fatty acids, and we shall speak below.
Fats derived from animal sources generally contain more saturated fatty acids than fats derived from plants. Similarly, more highly saturated fats tend to be solid at room temperature, while less saturated fats tend to be liquid.
Among meats, the richest in saturated fatty acids are the pig (having a high percentage of unsaturated fats), the beef and poultry, but also depends on the animal feed. In addition, includes butter (due to hydrogenation, increasing saturation) and tallow, margarine, milk, other industrial fats and cheese. An exception is fish, predominantly polyunsaturated fatty acids.
Speaking in numbers, we find that saturated fats make up 66% butter, 48% in beef fat, 40% of the fat in pork while only 14% in olive oil and 11 % in sunflower oil. An exception is found in coconut oil, which despite being of vegetable and liquid, with a high proportion of saturated fatty acids, 88%.
Regarding health effects, it is known that the intake of these fats has been associated with an increased likelihood of developing illnesses cardiovaculares due to their effect on LDL or "bad cholesterol". The increase in LDL cholesterol is that saturated fats reduce the levels of expression and activity of the LDL receptor, decreasing its uptake.
Nutritional recommendations advise against eating a quantity greater than 10% of caloric intake to reduce cardiovascular risk, and has been shown how changing these unsaturated fats for reducing cholesterol, remember that these are unsaturated fats from foods like oil olive, sunflower, and some nuts.