The other day an athlete was asking for advice on losing some weight for his race season next summer and during the conversation it became apparent that he was unsure about the difference in saturated fats, polyunsaturated fats and mono unsaturated fats. He wanted to know which he should avoid because they had too many calories and which were ok.
He didnt really know what was good fat or bad fat. After the initial shock, it occurred to me then, that sometimes we take it for granted that other people know things we are so familiar with. Of course for the purpose of losing weight all these fats can be treated the same, as having the same calories, but in terms of health there is a difference, so there are some we should avoid.
The Baddies
Fats in general are not bad as long as they are part of a healthy balanced diet its saturated fats the bad fat which can cause us the health problems. Sources are animal products including red meat and whole milk dairy products. Other sources are tropical vegetable oils such as coconut oil, palm oil and foods made with these oils (look out for these on food labels, just because it says vegetable fat doesn’t always mean it’s good fat and healthy). Poultry and fish contain saturated fat, but much less so than red meat. These fats are not actually necessary in your diet like other fats are, as your body can make the saturated fat it needs from the good fat.
Some of the health risks known to be attributed to saturated fats (bad fat) are a raise in low-density lipoprotein (LDL or “bad”) cholesterol that increases your risk of coronary heart disease (CHD) and blocked arteries.
Saturated fats aren’t the worst either. Trans fats (Trans-Fatty Acids) or Hydrogenated fat are the worst culprits, the really bad fat. These are made by heating vegetable oil in the presence of hydrogen gas. Why you might ask? To make them into suitable ingredients for a lot of the foods we regard as bad for us such as pastries and shortenings, margarines, biscuits, fried foods and many processed snack foods. The main reason for using these bad fats is their increased shelf life, which is good for manufacturers and supermarkets but deadly for us.
The Goodies
The good fat that we need in our diet is Monounsaturated and Polyunsaturated. Monounsaturated fats are found in olive oil, peanuts and peanut oil, avocados and seeds such as pumpkin seeds. Polyunsaturated fats are found in sunflower oil, corn, soy and in fish.
Knowing the difference
Usually saturated fats are solid at room temperature and monounsaturated and polyunsaturated fats are liquid (oils) at room temperature. Note monounsaturated oils like olive oil will become cloud and begin to solidify at lower temperatures but this is ok. Also polyunsaturated oils can spoil easily if exposed to heat or sunlight and can be damaged by cooking. So when you see the advert saying cooked in vegetable oil beware.
Conclusion
Not all fats are the villains in our diets some are essential and if we follow a healthy balanced diet, limiting processed foods and looking out for hidden trans fats we don’t have to spend our lives avoiding fat. We just need to keep an eye on the balance of energy we consume and the energy we use up.