Help! Are All Fats Bad?

Q: What Kinds of Fats Are Good to Include In My Diet? Or are they all bad?

A: It turns out that not all fat is “bad.” While it is true that fat contains 225% more calories per gram than protein and carbohydrates (9 calories per gram for fat versus 4 calories/gram for protein and carbohydrate) and thus it must be consumed in moderation for weight control, certain fats possess extraordinary health benefits. Others however deserve their bad reputation for promoting heart disease, obesity, and poor health.

The dietary teaching of the 1990s warned Americans to avoid fats at all costs. This energy-dense stuff would cause fatness, artery clogging, and myriad other harmful health effects. Terrified, dieters turned to all the “low fat” products they could find. Eager to capitalize on the craze, food manufacturers cut the fat and loaded up on the sugar) to offer an abundance of highly-processed “fat free” crackers, cookies, chips, breads, and ice creams. Dieters consumed these products in massive quantities, but yet Americans continued to get fatter.

Meanwhile, across the Atlantic in the countries bordering the Mediterranean Sea, the healthiest eaters in the world continued to relish olive oil, fatty fish, nuts, and other very healthy, high-fat foods. Now well-established as the most heart healthy way of eating, the Mediterranean diet is based on an eating plan which contains significantly more calories from fat (about 35-40% of calories) than what the American Heart Association has historically recommended (<30%). However, as research demonstrating the beneficial effects of the Mediterranean Diet accumulates, the dietary teaching in the United States is changing gears.

Good Fat vs. Bad Fat -

GOOD FATS

In general, unsaturated fatty acids are the more heart-healthy fats. The most heart healthy of the unsaturated fats are monounsaturated fats and a certain type of polyunsaturated fat. Monounsaturated fat increase HDL (high-density lipoprotein), the “good cholesterol” which helps to reduce atherosclerosis and cardiovascular disease. Common sources include olive, canola, and peanut oils. Essential fatty acids are a type of polyunsaturated fat that must be obtained from the diet. Unlike other fats, the body cannot produce omega-3 or omega-6 fatty acids. Omega-3 is an essential fatty acid found in egg yolk and cold- water fish like tuna, salmon, mackerel, cod, crab, shrimp, and oyster. Omega-3 fatty acids promote a healthy immune system and help protect against heart disease and many other diseases. They also contribute to reduced blood clotting, dilation of blood vessels, and reduced inflammation. Americans tend not to get enough of omega-3 fatty acids. A Mediterranean Diet includes at least two servings of omega-3-rich cold-water fish per week.

BAD FATS

Saturated fats are “bad fats” because they increase levels of LDL (low-density lipoprotein), the “bad” cholesterol which leads to atherosclerosis and cardiovascular disease. These fats contain no double bonds between carbon atoms making them typically (but not always) solid at room temperature and very stable. Think of a stick of butter as an example. Foods high in saturated fat include red meat, full-fat dairy products, and tropical oils like coconut and palm. Saturated fat should be avoided with no more than about 10% of total daily calories from saturated fat.

Trans fat, listed as “partially-hydrogenated” oil on a food ingredient list, results from a man-made effort to make unsaturated fat solid at room temperature in an effort to prolong its shelf life. The process involves breaking the double bond of the unsaturated fat. The product is a heart-damaging fat that increases LDL cholesterol even more than saturated fat. Due to legislation requiring food manufacturers to include the amount of trans fat on the nutrition label if it is more than 0.5g per serving, many processed foods that used to be high in trans fat such as chips, crackers, cakes, peanut butter, and margarine are now “trans-fat free.” Check the label and look on the ingredients list for “partially hydrogenated” oil to determine if a food still contains trans fat. If so, avoid that food.

In sum, what kinds and how much fat to eat is not as simple as we once thought. The old rule of the thumb that “all fat is bad” has proven incorrect. For weight management it still comes down to calories, regardless if they come from fat, protein, or carbohydrates, you must consume fewer calories than you expend to lose weight. But for optimal health, it turns out that the equation is a little bit more complicated.

Julie MED RD LD

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