But wait, bile isn’t the only thing added in here, our pancreas also adds pancreatic digestive juices called lipase to the duodenum which helps break down triglycerides into two fatty acids and a monoglyceride. After this step, though, the fat droplets don’t just disappear. Instead the fatty acids and monoglycerides are absorbed in the microvilli (remember these from Digestion, part I?) and reassembled into triglycerides.
Trans fats appear in foods which contain partially hydrogenated vegetable oils, these are worse than saturated fats (2). Trans fat can be found in fried foods, baked goods such as pastries, cakes and cookies and processed snack foods such as microwavable popcorn (5). This kind of fat can also raise LDL ‘bad’ cholesterol levels and supress levels of the ‘good’ cholesterol, high-density lipoprotein (HDL)(5). As a result, the risk of heart disease is much higher than if you were to consume only saturated fats (5, 6).
Of the three macronutrients, carbohydrates are our body’s preferred energy source because they are easier and quicker for our bodies to digest and use for energy. On the other hand, fat takes a different route before we can use it as energy because it is insoluble in our blood. Think of fat as being a reserve or our long-term source of energy that sticks around the longest. On the technical side, which we’re about to get very technical: fat is three fatty acids + a glycerol molecule, or a triglyceride (tri- as in three and glyceride).
Monounsaturated fats are typically liquid at room temperature but solidify if refrigerated. These heart-healthy fats are typically a good source of the antioxidant vitamin E, a nutrient often lacking in American diets. They can be found in olives; avocados; hazelnuts; almonds; Brazil nuts; cashews; sesame seeds; pumpkin seeds; and olive, canola, and peanut oils.
As SELF has previously reported, research is starting to suggest that consuming full-fat dairy products over low-fat or fat-free ones may have weight-control benefits. It may even help reduce type 2 diabetes risk. One cup (8 ounces) of whole milk contains 8 grams of fat with 5 grams saturated fat versus skim milk, which contains none of either. Other proponents of keeping the fat in dairy products point out that you need fat to absorb the vitamin A and D in the milk, since they are fat-soluble vitamins.
First, focus on reducing foods high in saturated fat, trans fat and cholesterol. Then emphasize food choices that include plenty of monounsaturated fats (MUFAs) and polyunsaturated fats (PUFAs). But a word of caution — don't go overboard even on healthy fats. All fats, including the healthy ones, are high in calories. So consume MUFA-rich and PUFA-rich foods instead of other fatty foods, not in addition to them.
While the guidelines called for more carbs in the form of fruits, vegetables and whole grains, what the average American understood was that carbs — any kind of carbs — were good (even refined carbohydrates!) and all fat was bad. The food industry pounced and high-carb, low-fat foods became the norm. Grocery store shelves and refrigerators were soon lined with low- and no-fat items that were packed with sugar to help enhance the flavor. Not coincidentally, both a sugar addiction as well as an obesity epidemic in America began soon after low-fat diets became the standard recommendation.
There are two basic kinds of fat, saturated and unsaturated. Unsaturated fats are considered “healthy fats” include both polyunsaturated and monounsaturated fats. These types of fats are typically found in vegetable oils that are liquid at room temperature, fatty fish, (salmon, trout, catfish, mackerel), and nuts and seeds. Polyunsaturated fats include Omega-3’s that are the building blocks of cell membranes I mentioned earlier. Omega-3’s also give your body energy and help support your hormones and immune system (3).
Saturated fats are found in animal products (meat, poultry skin, high-fat dairy, and eggs) and in vegetable fats that are liquid at room temperature, such as coconut and palm oils. The 2005 Dietary Guidelines recommend limiting saturated fats to 10% or less of your total calories, while the American Heart Association recommends keeping them to just 7% of total calories.
Unfortunately, buying this healthy fat isn’t as easy as just grabbing the first bottle you see. Make sure to pick only extra virgin varieties of the oil, which means no chemicals are involved when the oil is refined. Unfortunately, many common brands have been shown to fail the standards for extra virgin olive oils, meaning it’s important to choose wisely.
Fish such as salmon and sardines are an excellent source of omega-3 fats, as is flaxseed. Nuts (walnuts, almonds, pecans, macadamia nuts) all contain different mixes of good fats. Egg yolks contain a terrific mix of both saturated and unsaturated fat (as does beef). Coconut contains a particularly good form of fat known as MCT (medium chain triglycerides). And extra virgin olive oil is a rich source of healthy monounsaturated fat.
The worst type of dietary fat is the kind known as trans fat. It is a byproduct of a process called hydrogenation that is used to turn healthy oils into solids and to prevent them from becoming rancid. Trans fats have no known health benefits and that there is no safe level of consumption. Therefore, they have been officially banned in the United States.
The reality is, not all fats are created equal. Some are downright bad (like trans fats in margarines), some are misunderstood (like the saturated fat, lauric acid), and some fats are health heroes (like omega-3s). And, don’t get us wrong, eating foods that are packed with the wrong kinds of fat will make you fat, but with all the omegas, and monos, and polys out there, it can be kind of confusing which are which. To make things easier for you, we here at Eat This, Not That! found the best foods with good fats that you can add to your diet. But before you go off on a high-fat binge, remember that—like all food—even these healthy fats should be consumed in moderation.
According to Ayurveda, fats are used to promote healthy skin, support satiety and calm the nerves. On an Ayurvedic diet, it’s generally recommended to steer clear of trans fats and include plenty of vegetable-based fats and omega-3 fatty acids. Saturated fat is also encouraged in moderation by increasing your intake of foods like ghee, coconut oil and grass-fed beef.
The benefits of avocados are so numerous that they’re one of the healthiest fruits you can consume, not to mention one of the top healthy fats for keto. Avocado nutrition is rich in monounsaturated fats, which raises levels of good cholesterol while lowering the bad — talk about a double-whammy. Avocados are also packed with the benefits of vitamin E, which help fight free radical damage, boost immunity and act as an anti-aging nutrient for your skin. (7)
Omega-3 fatty acids. One type of polyunsaturated fat is made up of mainly omega-3 fatty acids and may be especially beneficial to your heart. Omega-3, found in some types of fatty fish, appears to decrease the risk of coronary artery disease. There are plant sources of omega-3 fatty acids. However, it hasn't yet been determined whether replacements for fish oil — plant-based or krill — have the same health effects as omega-3 fatty acid from fish.
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Additionally, adding plenty of nutritious fats to your diet is just one piece of the puzzle when it comes to health. Be sure to round out your diet with plenty of protein foods as well as a good variety of fruits, vegetables, legumes and whole grains to make sure you’re meeting your nutritional needs, and pair a well-balanced diet with regular physical activity and a healthy lifestyle for best results.
Monounsaturated fats. When you dip your bread in olive oil at an Italian restaurant, you're getting mostly monounsaturated fat. Monounsaturated fats have a single carbon-to-carbon double bond. The result is that it has two fewer hydrogen atoms than a saturated fat and a bend at the double bond. This structure keeps monounsaturated fats liquid at room temperature.