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 fatty acids are formed when a liquid fat is changed into a solid fat through a process called hydrogenation. Many manufacturers use hydrogenated oils as an ingredient because it extends the shelf life and consistency of foods. Trans fat will raise levels of “bad” LDL cholesterol and decrease levels of “good” HDL cholesterol. There are no safe levels of trans fat to eat each day, so try to avoid trans fat completely. Even if a food is advertised as “trans fat free,” it can still contain small amounts of trans fat. Therefore, avoid foods that list partially hydrogenated oils as ingredients. Sources of trans fat include:
These polyunsaturated fats, also known as essential fatty acids, are a must from your diet as they cannot be produced by the body like other fats. Omega-3 fatty acids are found in fatty fish like salmon, nuts and seeds like walnuts and flaxseed, and even some grass-fed meats. Omega-6 fatty acids are found in foods like safflower oil and grapeseed oil. While many of us get too many omega-6 fatty acids, we often fall short on our omega-3 fatty acids, which have been linked to healthier heart and brain function. Research indicates that intake of these two essential fatty acids should be balanced for optimal health.
Healthy fats have numerous benefits for your body when included as part of a healthy balanced diet. A diet which includes moderate to high amounts of monounsaturated fats can be useful in weight loss, as long as you don’t eat more calories than you are burning. A large study which combined the results of twenty four other studies found that participants who followed a high-monounsaturated fat diet had more effective weight loss than those who followed high-carbohydrate diets (10).
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.
Go nuts! Polyunsaturated fats in nuts activate genes that reduce fat storage and improve insulin metabolism. At about 13 grams per one-ounce serving, walnuts are one of the best dietary sources (they also have more omega-3 fatty acids than any other nut). A small Pennsylvania State study found that a diet rich in walnuts and walnut oil may help the body respond better to stress and can also help keep diastolic blood pressure levels down.
Healthy fats are easy to incorporate into snacks or appetizers. Guacamole served with sliced raw vegetables is one of the healthiest appetizers/snacks you can have. Walnuts and other nuts are delicious and crunchy. Nut butters are wonderful with celery sticks and other crunchy, raw vegetables. You can also top sliced granny smith apples with nut butters or layer slices of apples with slices of grass-fed cheese. Grass-fed cheese is also delicious with olives and is very satisfying.
All digestion first takes place in the mouth from chewing and saliva beginning to break down food. After you eat a fat-containing food, such as almonds, you first break down the food in your mouth. Next, it goes to your stomach where those solid pieces of almond are further broken down via stomach acid (2). Fats actually hang out in the stomach for quite a bit which is one reason for why fat keeps you feeling fuller longer. Depending on the volume of food and components of food, healthy fats may keep you feeling full for hours.
Additionally, a higher consumption of eggs can reduce your risk of metabolic syndrome, a cluster of conditions including factors like excess body fat, high blood sugar levels and abnormal cholesterol levels. Having any of these conditions makes you more likely to suffer from heart disease, stroke or type 2 diabetes. A 2016 study found that adults over 40 years old who regularly ate eggs significantly reduced their risk of metabolic syndrome. (10)
A handful of nuts goes a long way! They provide a protective benefit for heart health and contain what is known as good fat. Nuts help to burn calories more efficiently and are proven to add a satiety factor into your daily diet. This, Warren says, helps with not overloading on calories from other foods. A creative way to use nuts as salad add-ins is by whipping up a simple nut sauce made with almond butter to dress your salad. You can also chop a few of your favorites—almonds and walnuts are particularly good in salads—and sprinkle them in.
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So you might assume that fat is to blame for the obesity epidemic now plaguing our nation. Actually, fat is only part of the problem. Obesity is much more complicated than just overeating a single nutrient. Eating more calories -- from fats, carbohydrates, protein, and alcohol -- than you burn off leads to weight gain. Simply put, people who get little physical activity and eat a diet high in calories are going to gain weight. Genetics, age, sex, and lifestyle also weigh into the weight-gain formula.
What’s that, you say? But people who eat fat are fat. Well, no, not necessarily. Let us explain: Our bodies need dietary fat (which is why many fats are called “essential”) in order to lose weight and function properly. The right kinds of fats help increase satiety, maximize your metabolism, protect against heart disease, speed nutrients through your body, and improve your fat-soluble vitamin uptake. Not to mention, most unprocessed, high-fat foods also come packaged with many of those important nutrients, from vitamins and minerals to free-radical fighting antioxidants.
For decades, doctors, nutritionists, and health authorities have told us that a diet high in saturated fats raises blood cholesterol and increases the risk of heart disease and stroke. However, recent studies have made headlines by casting doubt on those claims, concluding that people who eat lots of saturated fat do not experience more cardiovascular disease than those who eat less.
Additionally, over 90% of soy, corn, cotton (seed), and canola grown in the US are GMO. Olive oil is not a GMO oil. However, some restaurants blend olive oil with cheaper oil, such as canola oil. There are serious health risks associated with GMO foods, including immune system malfunction, accelerated aging, changes in the gastrointestinal system (leaky gut), and faulty insulin regulation.
Perez-Martinez, P., Moreno-Conde, M., Cruz-Teno, C., Ruano, J., Fuentes, F., Delgado-Lista, J., Garcia-Rios, A., Marin, C., Gomez-Luna, M.J., Perez-Jimenez, F. and Roche, H.M., 2010. Dietary fat differentially influences regulatory endothelial function during the postprandial state in patients with metabolic syndrome: from the LIPGENE study. Atherosclerosis, 209(2), pp.533-538.
The best way to keep on top of the fats in your diet is to become a label reader. On the nutrition facts panel, you'll find all the information you need to make healthful choices. Look for foods that are low in total fat and well as in saturated and trans fats. Bear in mind that a product whose label boasts it is "trans fat free" can actually have up to 0.5 grams of trans fats per serving -- and these can add up quickly.
Fat, fat, fat! Would all of our weight loss problems be solved if we just eliminated fat from our diets? Unfortunately, it's not that simple. We actually need fats -- can't live without them, in fact. Fats are an important part of a healthy diet: They provide essential fatty acids, keep our skin soft, deliver fat-soluble vitamins, and are a great source of energizing fuel. But it's easy to get confused about good fats vs. bad fats, how much fat we should eat, how to avoid artery-clogging trans fats, and the role omega-3 fatty acids play in heart health.